sparksql 常用函数
! expr - Logical not.
%
expr1 % expr2 - Returns the remainder after expr1/expr2.
Examples:
> SELECT 2 % 1.8;
0.2
> SELECT MOD(2, 1.8);
0.2
&
expr1 & expr2 - Returns the result of bitwise AND of expr1 and expr2.
Examples:
> SELECT 3 & 5;
1
*
expr1 * expr2 - Returns expr1*expr2.
Examples:
> SELECT 2 * 3;
6
+
expr1 + expr2 - Returns expr1+expr2.
Examples:
> SELECT 1 + 2;
3
-
expr1 - expr2 - Returns expr1-expr2.
Examples:
> SELECT 2 - 1;
1
/
expr1 / expr2 - Returns expr1/expr2. It always performs floating point division.
Examples:
> SELECT 3 / 2;
1.5
> SELECT 2L / 2L;
1.0
<
expr1 < expr2 - Returns true if expr1 is less than expr2.
Arguments:
- expr1, expr2 - the two expressions must be same type or can be casted to a common type, and must be a type that can be ordered. For example, map type is not orderable, so it is not supported. For complex types such array/struct, the data types of fields must be orderable.
Examples:
> SELECT 1 < 2;
true
> SELECT 1.1 < '1';
false
> SELECT to_date('2009-07-30 04:17:52') < to_date('2009-07-30 04:17:52');
false
> SELECT to_date('2009-07-30 04:17:52') < to_date('2009-08-01 04:17:52');
true
> SELECT 1 < NULL;
NULL
<=
expr1 <= expr2 - Returns true if expr1 is less than or equal to expr2.
Arguments:
- expr1, expr2 - the two expressions must be same type or can be casted to a common type, and must be a type that can be ordered. For example, map type is not orderable, so it is not supported. For complex types such array/struct, the data types of fields must be orderable.
Examples:
> SELECT 2 <= 2;
true
> SELECT 1.0 <= '1';
true
> SELECT to_date('2009-07-30 04:17:52') <= to_date('2009-07-30 04:17:52');
true
> SELECT to_date('2009-07-30 04:17:52') <= to_date('2009-08-01 04:17:52');
true
> SELECT 1 <= NULL;
NULL
<=>
expr1 <=> expr2 - Returns same result as the EQUAL(=) operator for non-null operands, but returns true if both are null, false if one of the them is null.
Arguments:
- expr1, expr2 - the two expressions must be same type or can be casted to a common type, and must be a type that can be used in equality comparison. Map type is not supported. For complex types such array/struct, the data types of fields must be orderable.
Examples:
> SELECT 2 <=> 2;
true
> SELECT 1 <=> '1';
true
> SELECT true <=> NULL;
false
> SELECT NULL <=> NULL;
true
=
expr1 = expr2 - Returns true if expr1 equals expr2, or false otherwise.
Arguments:
- expr1, expr2 - the two expressions must be same type or can be casted to a common type, and must be a type that can be used in equality comparison. Map type is not supported. For complex types such array/struct, the data types of fields must be orderable.
Examples:
> SELECT 2 = 2;
true
> SELECT 1 = '1';
true
> SELECT true = NULL;
NULL
> SELECT NULL = NULL;
NULL
==
expr1 == expr2 - Returns true if expr1 equals expr2, or false otherwise.
Arguments:
- expr1, expr2 - the two expressions must be same type or can be casted to a common type, and must be a type that can be used in equality comparison. Map type is not supported. For complex types such array/struct, the data types of fields must be orderable.
Examples:
> SELECT 2 == 2;
true
> SELECT 1 == '1';
true
> SELECT true == NULL;
NULL
> SELECT NULL == NULL;
NULL
>
expr1 > expr2 - Returns true if expr1 is greater than expr2.
Arguments:
- expr1, expr2 - the two expressions must be same type or can be casted to a common type, and must be a type that can be ordered. For example, map type is not orderable, so it is not supported. For complex types such array/struct, the data types of fields must be orderable.
Examples:
> SELECT 2 > 1;
true
> SELECT 2 > '1.1';
true
> SELECT to_date('2009-07-30 04:17:52') > to_date('2009-07-30 04:17:52');
false
> SELECT to_date('2009-07-30 04:17:52') > to_date('2009-08-01 04:17:52');
false
> SELECT 1 > NULL;
NULL
>=
expr1 >= expr2 - Returns true if expr1 is greater than or equal to expr2.
Arguments:
- expr1, expr2 - the two expressions must be same type or can be casted to a common type, and must be a type that can be ordered. For example, map type is not orderable, so it is not supported. For complex types such array/struct, the data types of fields must be orderable.
Examples:
> SELECT 2 >= 1;
true
> SELECT 2.0 >= '2.1';
false
> SELECT to_date('2009-07-30 04:17:52') >= to_date('2009-07-30 04:17:52');
true
> SELECT to_date('2009-07-30 04:17:52') >= to_date('2009-08-01 04:17:52');
false
> SELECT 1 >= NULL;
NULL
^
expr1 ^ expr2 - Returns the result of bitwise exclusive OR of expr1 and expr2.
Examples:
> SELECT 3 ^ 5;
6
abs
abs(expr) - Returns the absolute value of the numeric value.
Examples:
> SELECT abs(-1);
1
acos
acos(expr) - Returns the inverse cosine (a.k.a. arc cosine) of expr, as if computed by java.lang.Math.acos.
Examples:
> SELECT acos(1);
0.0
> SELECT acos(2);
NaN
add_months
add_months(start_date, num_months) - Returns the date that is num_months after start_date.
Examples:
> SELECT add_months('2016-08-31', 1);
2016-09-30
Since: 1.5.0
aggregate
aggregate(expr, start, merge, finish) - Applies a binary operator to an initial state and all elements in the array, and reduces this to a single state. The final state is converted into the final result by applying a finish function.
Examples:
> SELECT aggregate(array(1, 2, 3), 0, (acc, x) -> acc + x);
6
> SELECT aggregate(array(1, 2, 3), 0, (acc, x) -> acc + x, acc -> acc * 10);
60
Since: 2.4.0
and
expr1 and expr2 - Logical AND.
approx_count_distinct
approx_count_distinct(expr[, relativeSD]) - Returns the estimated cardinality by HyperLogLog++. relativeSD defines the maximum estimation error allowed.
approx_percentile
approx_percentile(col, percentage [, accuracy]) - Returns the approximate percentile value of numeric column col at the given percentage. The value of percentage must be between 0.0 and 1.0. The accuracy parameter (default: 10000) is a positive numeric literal which controls approximation accuracy at the cost of memory. Higher value of accuracy yields better accuracy, 1.0/accuracy is the relative error of the approximation. When percentage is an array, each value of the percentage array must be between 0.0 and 1.0. In this case, returns the approximate percentile array of column col at the given percentage array.
Examples:
> SELECT approx_percentile(10.0, array(0.5, 0.4, 0.1), 100);
[10.0,10.0,10.0]
> SELECT approx_percentile(10.0, 0.5, 100);
10.0
array
array(expr, ...) - Returns an array with the given elements.
Examples:
> SELECT array(1, 2, 3);
[1,2,3]
array_contains
array_contains(array, value) - Returns true if the array contains the value.
Examples:
> SELECT array_contains(array(1, 2, 3), 2);
true
array_distinct
array_distinct(array) - Removes duplicate values from the array.
Examples:
> SELECT array_distinct(array(1, 2, 3, null, 3));
[1,2,3,null]
Since: 2.4.0
array_except
array_except(array1, array2) - Returns an array of the elements in array1 but not in array2, without duplicates.
Examples:
> SELECT array_except(array(1, 2, 3), array(1, 3, 5));
[2]
Since: 2.4.0
array_intersect
array_intersect(array1, array2) - Returns an array of the elements in the intersection of array1 and array2, without duplicates.
Examples:
> SELECT array_intersect(array(1, 2, 3), array(1, 3, 5));
[1,3]
Since: 2.4.0
array_join
array_join(array, delimiter[, nullReplacement]) - Concatenates the elements of the given array using the delimiter and an optional string to replace nulls. If no value is set for nullReplacement, any null value is filtered.
Examples:
> SELECT array_join(array('hello', 'world'), ' ');
hello world
> SELECT array_join(array('hello', null ,'world'), ' ');
hello world
> SELECT array_join(array('hello', null ,'world'), ' ', ',');
hello , world
Since: 2.4.0
array_max
array_max(array) - Returns the maximum value in the array. NULL elements are skipped.
Examples:
> SELECT array_max(array(1, 20, null, 3));
20
Since: 2.4.0
array_min
array_min(array) - Returns the minimum value in the array. NULL elements are skipped.
Examples:
> SELECT array_min(array(1, 20, null, 3));
1
Since: 2.4.0
array_position
array_position(array, element) - Returns the (1-based) index of the first element of the array as long.
Examples:
> SELECT array_position(array(3, 2, 1), 1);
3
Since: 2.4.0
array_remove
array_remove(array, element) - Remove all elements that equal to element from array.
Examples:
> SELECT array_remove(array(1, 2, 3, null, 3), 3);
[1,2,null]
Since: 2.4.0
array_repeat
array_repeat(element, count) - Returns the array containing element count times.
Examples:
> SELECT array_repeat('123', 2);
["123","123"]
Since: 2.4.0
array_sort
array_sort(array) - Sorts the input array in ascending order. The elements of the input array must be orderable. Null elements will be placed at the end of the returned array.
Examples:
> SELECT array_sort(array('b', 'd', null, 'c', 'a'));
["a","b","c","d",null]
Since: 2.4.0
array_union
array_union(array1, array2) - Returns an array of the elements in the union of array1 and array2, without duplicates.
Examples:
> SELECT array_union(array(1, 2, 3), array(1, 3, 5));
[1,2,3,5]
Since: 2.4.0
arrays_overlap
arrays_overlap(a1, a2) - Returns true if a1 contains at least a non-null element present also in a2. If the arrays have no common element and they are both non-empty and either of them contains a null element null is returned, false otherwise.
Examples:
> SELECT arrays_overlap(array(1, 2, 3), array(3, 4, 5));
true
Since: 2.4.0
arrays_zip
arrays_zip(a1, a2, ...) - Returns a merged array of structs in which the N-th struct contains all N-th values of input arrays.
Examples:
> SELECT arrays_zip(array(1, 2, 3), array(2, 3, 4));
[{"0":1,"1":2},{"0":2,"1":3},{"0":3,"1":4}]
> SELECT arrays_zip(array(1, 2), array(2, 3), array(3, 4));
[{"0":1,"1":2,"2":3},{"0":2,"1":3,"2":4}]
Since: 2.4.0
ascii
ascii(str) - Returns the numeric value of the first character of str.
Examples:
> SELECT ascii('222');
50
> SELECT ascii(2);
50
Since: 1.5.0
asin
asin(expr) - Returns the inverse sine (a.k.a. arc sine) the arc sin of expr, as if computed by java.lang.Math.asin.
Examples:
> SELECT asin(0);
0.0
> SELECT asin(2);
NaN
assert_true
assert_true(expr) - Throws an exception if expr is not true.
Examples:
> SELECT assert_true(0 < 1);
NULL
atan
atan(expr) - Returns the inverse tangent (a.k.a. arc tangent) of expr, as if computed by java.lang.Math.atan
Examples:
> SELECT atan(0);
0.0
atan2
atan2(exprY, exprX) - Returns the angle in radians between the positive x-axis of a plane and the point given by the coordinates (exprX, exprY), as if computed by java.lang.Math.atan2.
Arguments:
- exprY - coordinate on y-axis
- exprX - coordinate on x-axis
Examples:
> SELECT atan2(0, 0);
0.0
avg
avg(expr) - Returns the mean calculated from values of a group.
base64
base64(bin) - Converts the argument from a binary bin to a base 64 string.
Examples:
> SELECT base64('Spark SQL');
U3BhcmsgU1FM
Since: 1.5.0
bigint
bigint(expr) - Casts the value expr to the target data type bigint.
bin
bin(expr) - Returns the string representation of the long value expr represented in binary.
Examples:
> SELECT bin(13);
1101
> SELECT bin(-13);
1111111111111111111111111111111111111111111111111111111111110011
> SELECT bin(13.3);
1101
binary
binary(expr) - Casts the value expr to the target data type binary.
bit_length
bit_length(expr) - Returns the bit length of string data or number of bits of binary data.
Examples:
> SELECT bit_length('Spark SQL');
72
Since: 2.3.0
boolean
boolean(expr) - Casts the value expr to the target data type boolean.
bround
bround(expr, d) - Returns expr rounded to d decimal places using HALF_EVEN rounding mode.
Examples:
> SELECT bround(2.5, 0);
2.0
cardinality
cardinality(expr) - Returns the size of an array or a map. The function returns -1 if its input is null and spark.sql.legacy.sizeOfNull is set to true. If spark.sql.legacy.sizeOfNull is set to false, the function returns null for null input. By default, the spark.sql.legacy.sizeOfNull parameter is set to true.
Examples:
> SELECT cardinality(array('b', 'd', 'c', 'a'));
4
> SELECT cardinality(map('a', 1, 'b', 2));
2
> SELECT cardinality(NULL);
-1
cast
cast(expr AS type) - Casts the value expr to the target data type type.
Examples:
> SELECT cast('10' as int);
10
cbrt
cbrt(expr) - Returns the cube root of expr.
Examples:
> SELECT cbrt(27.0);
3.0
ceil
ceil(expr) - Returns the smallest integer not smaller than expr.
Examples:
> SELECT ceil(-0.1);
0
> SELECT ceil(5);
5
ceiling
ceiling(expr) - Returns the smallest integer not smaller than expr.
Examples:
> SELECT ceiling(-0.1);
0
> SELECT ceiling(5);
5
char
char(expr) - Returns the ASCII character having the binary equivalent to expr. If n is larger than 256 the result is equivalent to chr(n % 256)
Examples:
> SELECT char(65);
A
Since: 2.3.0
char_length
char_length(expr) - Returns the character length of string data or number of bytes of binary data. The length of string data includes the trailing spaces. The length of binary data includes binary zeros.
Examples:
> SELECT char_length('Spark SQL ');
10
> SELECT CHAR_LENGTH('Spark SQL ');
10
> SELECT CHARACTER_LENGTH('Spark SQL ');
10
Since: 1.5.0
character_length
character_length(expr) - Returns the character length of string data or number of bytes of binary data. The length of string data includes the trailing spaces. The length of binary data includes binary zeros.
Examples:
> SELECT character_length('Spark SQL ');
10
> SELECT CHAR_LENGTH('Spark SQL ');
10
> SELECT CHARACTER_LENGTH('Spark SQL ');
10
Since: 1.5.0
chr
chr(expr) - Returns the ASCII character having the binary equivalent to expr. If n is larger than 256 the result is equivalent to chr(n % 256)
Examples:
> SELECT chr(65);
A
Since: 2.3.0
coalesce
coalesce(expr1, expr2, ...) - Returns the first non-null argument if exists. Otherwise, null.
Examples:
> SELECT coalesce(NULL, 1, NULL);
1
Since: 1.0.0
collect_list
collect_list(expr) - Collects and returns a list of non-unique elements.
collect_set
collect_set(expr) - Collects and returns a set of unique elements.
concat
concat(col1, col2, ..., colN) - Returns the concatenation of col1, col2, ..., colN.
Examples:
> SELECT concat('Spark', 'SQL');
SparkSQL
> SELECT concat(array(1, 2, 3), array(4, 5), array(6));
[1,2,3,4,5,6]
Note: at logic for arrays is available since 2.4.0.
concat_ws
concat_ws(sep, [str | array(str)]+) - Returns the concatenation of the strings separated by sep.
Examples:
> SELECT concat_ws(' ', 'Spark', 'SQL');
Spark SQL
Since: 1.5.0
conv
conv(num, from_base, to_base) - Convert num from from_base to to_base.
Examples:
> SELECT conv('100', 2, 10);
4
> SELECT conv(-10, 16, -10);
-16
corr
corr(expr1, expr2) - Returns Pearson coefficient of correlation between a set of number pairs.
cos
cos(expr) - Returns the cosine of expr, as if computed by java.lang.Math.cos.
Arguments:
- expr - angle in radians
Examples:
> SELECT cos(0);
1.0
cosh
cosh(expr) - Returns the hyperbolic cosine of expr, as if computed by java.lang.Math.cosh.
Arguments:
- expr - hyperbolic angle
Examples:
> SELECT cosh(0);
1.0
cot
cot(expr) - Returns the cotangent of expr, as if computed by 1/java.lang.Math.cot.
Arguments:
- expr - angle in radians
Examples:
> SELECT cot(1);
0.6420926159343306
count
count(*) - Returns the total number of retrieved rows, including rows containing null.
count(expr[, expr...]) - Returns the number of rows for which the supplied expression(s) are all non-null.
count(DISTINCT expr[, expr...]) - Returns the number of rows for which the supplied expression(s) are unique and non-null.
count_min_sketch
count_min_sketch(col, eps, confidence, seed) - Returns a count-min sketch of a column with the given esp, confidence and seed. The result is an array of bytes, which can be deserialized to a CountMinSketch before usage. Count-min sketch is a probabilistic data structure used for cardinality estimation using sub-linear space.
covar_pop
covar_pop(expr1, expr2) - Returns the population covariance of a set of number pairs.
covar_samp
covar_samp(expr1, expr2) - Returns the sample covariance of a set of number pairs.
crc32
crc32(expr) - Returns a cyclic redundancy check value of the expr as a bigint.
Examples:
> SELECT crc32('Spark');
1557323817
cube
cube([col1[, col2 ..]]) - create a multi-dimensional cube using the specified columns so that we can run aggregation on them.
Examples:
> SELECT name, age, count(*) FROM VALUES (2, 'Alice'), (5, 'Bob') people(age, name) GROUP BY cube(name, age);
NULL 2 1
NULL NULL 2
Alice 2 1
Bob 5 1
NULL 5 1
Bob NULL 1
Alice NULL 1
Since: 2.0.0
cume_dist
cume_dist() - Computes the position of a value relative to all values in the partition.
current_database
current_database() - Returns the current database.
Examples:
> SELECT current_database();
default
current_date
current_date() - Returns the current date at the start of query evaluation.
Since: 1.5.0
current_timestamp
current_timestamp() - Returns the current timestamp at the start of query evaluation.
Since: 1.5.0
date
date(expr) - Casts the value expr to the target data type date.
date_add
date_add(start_date, num_days) - Returns the date that is num_days after start_date.
Examples:
> SELECT date_add('2016-07-30', 1);
2016-07-31
Since: 1.5.0
date_format
date_format(timestamp, fmt) - Converts timestamp to a value of string in the format specified by the date format fmt.
Arguments:
- timestamp - A date/timestamp or string to be converted to the given format.
- fmt - Date/time format pattern to follow. See
java.text.SimpleDateFormatfor valid date and time format patterns.
Examples:
> SELECT date_format('2016-04-08', 'y');
2016
Since: 1.5.0
date_sub
date_sub(start_date, num_days) - Returns the date that is num_days before start_date.
Examples:
> SELECT date_sub('2016-07-30', 1);
2016-07-29
Since: 1.5.0
date_trunc
date_trunc(fmt, ts) - Returns timestamp ts truncated to the unit specified by the format model fmt. fmt should be one of ["YEAR", "YYYY", "YY", "MON", "MONTH", "MM", "DAY", "DD", "HOUR", "MINUTE", "SECOND", "WEEK", "QUARTER"]
Examples:
> SELECT date_trunc('YEAR', '2015-03-05T09:32:05.359');
2015-01-01 00:00:00
> SELECT date_trunc('MM', '2015-03-05T09:32:05.359');
2015-03-01 00:00:00
> SELECT date_trunc('DD', '2015-03-05T09:32:05.359');
2015-03-05 00:00:00
> SELECT date_trunc('HOUR', '2015-03-05T09:32:05.359');
2015-03-05 09:00:00
Since: 2.3.0
datediff
datediff(endDate, startDate) - Returns the number of days from startDate to endDate.
Examples:
> SELECT datediff('2009-07-31', '2009-07-30');
1
> SELECT datediff('2009-07-30', '2009-07-31');
-1
Since: 1.5.0
day
day(date) - Returns the day of month of the date/timestamp.
Examples:
> SELECT day('2009-07-30');
30
Since: 1.5.0
dayofmonth
dayofmonth(date) - Returns the day of month of the date/timestamp.
Examples:
> SELECT dayofmonth('2009-07-30');
30
Since: 1.5.0
dayofweek
dayofweek(date) - Returns the day of the week for date/timestamp (1 = Sunday, 2 = Monday, ..., 7 = Saturday).
Examples:
> SELECT dayofweek('2009-07-30');
5
Since: 2.3.0
dayofyear
dayofyear(date) - Returns the day of year of the date/timestamp.
Examples:
> SELECT dayofyear('2016-04-09');
100
Since: 1.5.0
decimal
decimal(expr) - Casts the value expr to the target data type decimal.
decode
decode(bin, charset) - Decodes the first argument using the second argument character set.
Examples:
> SELECT decode(encode('abc', 'utf-8'), 'utf-8');
abc
Since: 1.5.0
degrees
degrees(expr) - Converts radians to degrees.
Arguments:
- expr - angle in radians
Examples:
> SELECT degrees(3.141592653589793);
180.0
dense_rank
dense_rank() - Computes the rank of a value in a group of values. The result is one plus the previously assigned rank value. Unlike the function rank, dense_rank will not produce gaps in the ranking sequence.
double
double(expr) - Casts the value expr to the target data type double.
e
e() - Returns Euler's number, e.
Examples:
> SELECT e();
2.718281828459045
element_at
element_at(array, index) - Returns element of array at given (1-based) index. If index < 0, accesses elements from the last to the first. Returns NULL if the index exceeds the length of the array.
element_at(map, key) - Returns value for given key, or NULL if the key is not contained in the map
Examples:
> SELECT element_at(array(1, 2, 3), 2);
2
> SELECT element_at(map(1, 'a', 2, 'b'), 2);
b
Since: 2.4.0
elt
elt(n, input1, input2, ...) - Returns the n-th input, e.g., returns input2 when n is 2.
Examples:
> SELECT elt(1, 'scala', 'java');
scala
Since: 2.0.0
encode
encode(str, charset) - Encodes the first argument using the second argument character set.
Examples:
> SELECT encode('abc', 'utf-8');
abc
Since: 1.5.0
exists
exists(expr, pred) - Tests whether a predicate holds for one or more elements in the array.
Examples:
> SELECT exists(array(1, 2, 3), x -> x % 2 == 0);
true
Since: 2.4.0
exp
exp(expr) - Returns e to the power of expr.
Examples:
> SELECT exp(0);
1.0
explode
explode(expr) - Separates the elements of array expr into multiple rows, or the elements of map expr into multiple rows and columns.
Examples:
> SELECT explode(array(10, 20));
10
20
explode_outer
explode_outer(expr) - Separates the elements of array expr into multiple rows, or the elements of map expr into multiple rows and columns.
Examples:
> SELECT explode_outer(array(10, 20));
10
20
expm1
expm1(expr) - Returns exp(expr) - 1.
Examples:
> SELECT expm1(0);
0.0
factorial
factorial(expr) - Returns the factorial of expr. expr is [0..20]. Otherwise, null.
Examples:
> SELECT factorial(5);
120
filter
filter(expr, func) - Filters the input array using the given predicate.
Examples:
> SELECT filter(array(1, 2, 3), x -> x % 2 == 1);
[1,3]
Since: 2.4.0
find_in_set
find_in_set(str, str_array) - Returns the index (1-based) of the given string (str) in the comma-delimited list (str_array). Returns 0, if the string was not found or if the given string (str) contains a comma.
Examples:
> SELECT find_in_set('ab','abc,b,ab,c,def');
3
Since: 1.5.0
first
first(expr[, isIgnoreNull]) - Returns the first value of expr for a group of rows. If isIgnoreNull is true, returns only non-null values.
first_value
first_value(expr[, isIgnoreNull]) - Returns the first value of expr for a group of rows. If isIgnoreNull is true, returns only non-null values.
flatten
flatten(arrayOfArrays) - Transforms an array of arrays into a single array.
Examples:
> SELECT flatten(array(array(1, 2), array(3, 4)));
[1,2,3,4]
Since: 2.4.0
float
float(expr) - Casts the value expr to the target data type float.
floor
floor(expr) - Returns the largest integer not greater than expr.
Examples:
> SELECT floor(-0.1);
-1
> SELECT floor(5);
5
format_number
format_number(expr1, expr2) - Formats the number expr1 like '#,###,###.##', rounded to expr2 decimal places. If expr2 is 0, the result has no decimal point or fractional part. expr2 also accept a user specified format. This is supposed to function like MySQL's FORMAT.
Examples:
> SELECT format_number(12332.123456, 4);
12,332.1235
> SELECT format_number(12332.123456, '##################.###');
12332.123
Since: 1.5.0
format_string
format_string(strfmt, obj, ...) - Returns a formatted string from printf-style format strings.
Examples:
> SELECT format_string("Hello World %d %s", 100, "days");
Hello World 100 days
Since: 1.5.0
from_json
from_json(jsonStr, schema[, options]) - Returns a struct value with the given jsonStr and schema.
Examples:
> SELECT from_json('{"a":1, "b":0.8}', 'a INT, b DOUBLE');
{"a":1, "b":0.8}
> SELECT from_json('{"time":"26/08/2015"}', 'time Timestamp', map('timestampFormat', 'dd/MM/yyyy'));
{"time":"2015-08-26 00:00:00.0"}
Since: 2.2.0
from_unixtime
from_unixtime(unix_time, format) - Returns unix_time in the specified format.
Arguments:
- unix_time - UNIX Timestamp to be converted to the provided format.
- format - Date/time format pattern to follow. See
java.text.SimpleDateFormatfor valid date and time format patterns.
Examples:
> SELECT from_unixtime(0, 'yyyy-MM-dd HH:mm:ss');
1970-01-01 00:00:00
Since: 1.5.0
from_utc_timestamp
from_utc_timestamp(timestamp, timezone) - Given a timestamp like '2017-07-14 02:40:00.0', interprets it as a time in UTC, and renders that time as a timestamp in the given time zone. For example, 'GMT+1' would yield '2017-07-14 03:40:00.0'.
Examples:
> SELECT from_utc_timestamp('2016-08-31', 'Asia/Seoul');
2016-08-31 09:00:00
Since: 1.5.0
get_json_object
get_json_object(json_txt, path) - Extracts a json object from path.
Examples:
> SELECT get_json_object('{"a":"b"}', '$.a');
b
greatest
greatest(expr, ...) - Returns the greatest value of all parameters, skipping null values.
Examples:
> SELECT greatest(10, 9, 2, 4, 3);
10
grouping
grouping(col) - indicates whether a specified column in a GROUP BY is aggregated or not, returns 1 for aggregated or 0 for not aggregated in the result set.",
Examples:
> SELECT name, grouping(name), sum(age) FROM VALUES (2, 'Alice'), (5, 'Bob') people(age, name) GROUP BY cube(name);
Alice 0 2
NULL 1 7
Bob 0 5
Since: 2.0.0
grouping_id
grouping_id([col1[, col2 ..]]) - returns the level of grouping, equals to (grouping(c1) << (n-1)) + (grouping(c2) << (n-2)) + ... + grouping(cn)
Examples:
> SELECT name, grouping_id(), sum(age), avg(height) FROM VALUES (2, 'Alice', 165), (5, 'Bob', 180) people(age, name, height) GROUP BY cube(name, height);
NULL 2 2 165.0
Alice 0 2 165.0
NULL 2 5 180.0
NULL 3 7 172.5
Bob 0 5 180.0
Bob 1 5 180.0
Alice 1 2 165.0
Note:
Input columns should match with grouping columns exactly, or empty (means all the grouping columns).
Since: 2.0.0
hash
hash(expr1, expr2, ...) - Returns a hash value of the arguments.
Examples:
> SELECT hash('Spark', array(123), 2);
-1321691492
hex
hex(expr) - Converts expr to hexadecimal.
Examples:
> SELECT hex(17);
11
> SELECT hex('Spark SQL');
537061726B2053514C
hour
hour(timestamp) - Returns the hour component of the string/timestamp.
Examples:
> SELECT hour('2009-07-30 12:58:59');
12
Since: 1.5.0
hypot
hypot(expr1, expr2) - Returns sqrt(expr12 + expr22).
Examples:
> SELECT hypot(3, 4);
5.0
if
if(expr1, expr2, expr3) - If expr1 evaluates to true, then returns expr2; otherwise returns expr3.
Examples:
> SELECT if(1 < 2, 'a', 'b');
a
ifnull
ifnull(expr1, expr2) - Returns expr2 if expr1 is null, or expr1 otherwise.
Examples:
> SELECT ifnull(NULL, array('2'));
["2"]Since: 2.0.0
in
expr1 in(expr2, expr3, ...) - Returns true if expr equals to any valN.
Arguments:
- expr1, expr2, expr3, ... - the arguments must be same type.
Examples:
> SELECT 1 in(1, 2, 3);
true
> SELECT 1 in(2, 3, 4);
false
> SELECT named_struct('a', 1, 'b', 2) in(named_struct('a', 1, 'b', 1), named_struct('a', 1, 'b', 3));
false
> SELECT named_struct('a', 1, 'b', 2) in(named_struct('a', 1, 'b', 2), named_struct('a', 1, 'b', 3));
true
initcap
initcap(str) - Returns str with the first letter of each word in uppercase. All other letters are in lowercase. Words are delimited by white space.
Examples:
> SELECT initcap('sPark sql');
Spark Sql
Since: 1.5.0
inline
inline(expr) - Explodes an array of structs into a table.
Examples:
> SELECT inline(array(struct(1, 'a'), struct(2, 'b')));
1 a
2 b
inline_outer
inline_outer(expr) - Explodes an array of structs into a table.
Examples:
> SELECT inline_outer(array(struct(1, 'a'), struct(2, 'b')));
1 a
2 b
input_file_block_length
input_file_block_length() - Returns the length of the block being read, or -1 if not available.
input_file_block_start
input_file_block_start() - Returns the start offset of the block being read, or -1 if not available.
input_file_name
input_file_name() - Returns the name of the file being read, or empty string if not available.
instr
instr(str, substr) - Returns the (1-based) index of the first occurrence of substr in str.
Examples:
> SELECT instr('SparkSQL', 'SQL');
6
Since: 1.5.0
int
int(expr) - Casts the value expr to the target data type int.
isnan
isnan(expr) - Returns true if expr is NaN, or false otherwise.
Examples:
> SELECT isnan(cast('NaN' as double));
true
Since: 1.5.0
isnotnull
isnotnull(expr) - Returns true if expr is not null, or false otherwise.
Examples:
> SELECT isnotnull(1);
true
Since: 1.0.0
isnull
isnull(expr) - Returns true if expr is null, or false otherwise.
Examples:
> SELECT isnull(1);
false
Since: 1.0.0
java_method
java_method(class, method[, arg1[, arg2 ..]]) - Calls a method with reflection.
Examples:
> SELECT java_method('java.util.UUID', 'randomUUID');
c33fb387-8500-4bfa-81d2-6e0e3e930df2
> SELECT java_method('java.util.UUID', 'fromString', 'a5cf6c42-0c85-418f-af6c-3e4e5b1328f2');
a5cf6c42-0c85-418f-af6c-3e4e5b1328f2
json_tuple
json_tuple(jsonStr, p1, p2, ..., pn) - Returns a tuple like the function get_json_object, but it takes multiple names. All the input parameters and output column types are string.
Examples:
> SELECT json_tuple('{"a":1, "b":2}', 'a', 'b');
1 2
kurtosis
kurtosis(expr) - Returns the kurtosis value calculated from values of a group.
lag
lag(input[, offset[, default]]) - Returns the value of input at the offsetth row before the current row in the window. The default value of offset is 1 and the default value of default is null. If the value of input at the offsetth row is null, null is returned. If there is no such offset row (e.g., when the offset is 1, the first row of the window does not have any previous row), default is returned.
last
last(expr[, isIgnoreNull]) - Returns the last value of expr for a group of rows. If isIgnoreNull is true, returns only non-null values.
last_day
last_day(date) - Returns the last day of the month which the date belongs to.
Examples:
> SELECT last_day('2009-01-12');
2009-01-31
Since: 1.5.0
last_value
last_value(expr[, isIgnoreNull]) - Returns the last value of expr for a group of rows. If isIgnoreNull is true, returns only non-null values.
lcase
lcase(str) - Returns str with all characters changed to lowercase.
Examples:
> SELECT lcase('SparkSql');
sparksql
Since: 1.0.1
lead
lead(input[, offset[, default]]) - Returns the value of input at the offsetth row after the current row in the window. The default value of offset is 1 and the default value of default is null. If the value of input at the offsetth row is null, null is returned. If there is no such an offset row (e.g., when the offset is 1, the last row of the window does not have any subsequent row), default is returned.
least
least(expr, ...) - Returns the least value of all parameters, skipping null values.
Examples:
> SELECT least(10, 9, 2, 4, 3);
2
left
left(str, len) - Returns the leftmost len(len can be string type) characters from the string str,if len is less or equal than 0 the result is an empty string.
Examples:
> SELECT left('Spark SQL', 3);
Spa
Since: 2.3.0
length
length(expr) - Returns the character length of string data or number of bytes of binary data. The length of string data includes the trailing spaces. The length of binary data includes binary zeros.
Examples:
> SELECT length('Spark SQL ');
10
> SELECT CHAR_LENGTH('Spark SQL ');
10
> SELECT CHARACTER_LENGTH('Spark SQL ');
10
Since: 1.5.0
levenshtein
levenshtein(str1, str2) - Returns the Levenshtein distance between the two given strings.
Examples:
> SELECT levenshtein('kitten', 'sitting');
3
Since: 1.5.0
like
str like pattern - Returns true if str matches pattern, null if any arguments are null, false otherwise.
Arguments:
- str - a string expression
-
pattern - a string expression. The pattern is a string which is matched literally, with exception to the following special symbols:
_ matches any one character in the input (similar to . in posix regular expressions)
% matches zero or more characters in the input (similar to .* in posix regular expressions)
The escape character is '\'. If an escape character precedes a special symbol or another escape character, the following character is matched literally. It is invalid to escape any other character.
Since Spark 2.0, string literals are unescaped in our SQL parser. For example, in order to match "\abc", the pattern should be "\abc".
When SQL config 'spark.sql.parser.escapedStringLiterals' is enabled, it fallbacks to Spark 1.6 behavior regarding string literal parsing. For example, if the config is enabled, the pattern to match "\abc" should be "\abc".
Examples:
> SELECT '%SystemDrive%\Users\John' like '\%SystemDrive\%\\Users%'
true
Note:
Use RLIKE to match with standard regular expressions.
Since: 1.0.0
ln
ln(expr) - Returns the natural logarithm (base e) of expr.
Examples:
> SELECT ln(1);
0.0
locate
locate(substr, str[, pos]) - Returns the position of the first occurrence of substr in str after position pos. The given pos and return value are 1-based.
Examples:
> SELECT locate('bar', 'foobarbar');
4
> SELECT locate('bar', 'foobarbar', 5);
7
> SELECT POSITION('bar' IN 'foobarbar');
4
Since: 1.5.0
log
log(base, expr) - Returns the logarithm of expr with base.
Examples:
> SELECT log(10, 100);
2.0
log10
log10(expr) - Returns the logarithm of expr with base 10.
Examples:
> SELECT log10(10);
1.0
log1p
log1p(expr) - Returns log(1 + expr).
Examples:
> SELECT log1p(0);
0.0
log2
log2(expr) - Returns the logarithm of expr with base 2.
Examples:
> SELECT log2(2);
1.0
lower
lower(str) - Returns str with all characters changed to lowercase.
Examples:
> SELECT lower('SparkSql');
sparksql
Since: 1.0.1
lpad
lpad(str, len, pad) - Returns str, left-padded with pad to a length of len. If str is longer than len, the return value is shortened to len characters.
Examples:
> SELECT lpad('hi', 5, '??');
???hi
> SELECT lpad('hi', 1, '??');
h
Since: 1.5.0
ltrim
ltrim(str) - Removes the leading space characters from str.
ltrim(trimStr, str) - Removes the leading string contains the characters from the trim string
Arguments:
- str - a string expression
- trimStr - the trim string characters to trim, the default value is a single space
Examples:
> SELECT ltrim(' SparkSQL ');
SparkSQL
> SELECT ltrim('Sp', 'SSparkSQLS');
arkSQLS
Since: 1.5.0
map
map(key0, value0, key1, value1, ...) - Creates a map with the given key/value pairs.
Examples:
> SELECT map(1.0, '2', 3.0, '4');
{1.0:"2",3.0:"4"}
map_concat
map_concat(map, ...) - Returns the union of all the given maps
Examples:
> SELECT map_concat(map(1, 'a', 2, 'b'), map(2, 'c', 3, 'd'));
{1:"a",2:"c",3:"d"}
Since: 2.4.0
map_from_arrays
map_from_arrays(keys, values) - Creates a map with a pair of the given key/value arrays. All elements in keys should not be null
Examples:
> SELECT map_from_arrays(array(1.0, 3.0), array('2', '4'));
{1.0:"2",3.0:"4"}
Since: 2.4.0
map_from_entries
map_from_entries(arrayOfEntries) - Returns a map created from the given array of entries.
Examples:
> SELECT map_from_entries(array(struct(1, 'a'), struct(2, 'b')));
{1:"a",2:"b"}
Since: 2.4.0
map_keys
map_keys(map) - Returns an unordered array containing the keys of the map.
Examples:
> SELECT map_keys(map(1, 'a', 2, 'b'));
[1,2]
map_values
map_values(map) - Returns an unordered array containing the values of the map.
Examples:
> SELECT map_values(map(1, 'a', 2, 'b'));
["a","b"]
max
max(expr) - Returns the maximum value of expr.
md5
md5(expr) - Returns an MD5 128-bit checksum as a hex string of expr.
Examples:
> SELECT md5('Spark');
8cde774d6f7333752ed72cacddb05126
mean
mean(expr) - Returns the mean calculated from values of a group.
min
min(expr) - Returns the minimum value of expr.
minute
minute(timestamp) - Returns the minute component of the string/timestamp.
Examples:
> SELECT minute('2009-07-30 12:58:59');
58
Since: 1.5.0
mod
expr1 mod expr2 - Returns the remainder after expr1/expr2.
Examples:
> SELECT 2 mod 1.8;
0.2
> SELECT MOD(2, 1.8);
0.2
monotonically_increasing_id
monotonically_increasing_id() - Returns monotonically increasing 64-bit integers. The generated ID is guaranteed to be monotonically increasing and unique, but not consecutive. The current implementation puts the partition ID in the upper 31 bits, and the lower 33 bits represent the record number within each partition. The assumption is that the data frame has less than 1 billion partitions, and each partition has less than 8 billion records. The function is non-deterministic because its result depends on partition IDs.
month
month(date) - Returns the month component of the date/timestamp.
Examples:
> SELECT month('2016-07-30');
7
Since: 1.5.0
months_between
months_between(timestamp1, timestamp2[, roundOff]) - If timestamp1 is later than timestamp2, then the result is positive. If timestamp1 and timestamp2 are on the same day of month, or both are the last day of month, time of day will be ignored. Otherwise, the difference is calculated based on 31 days per month, and rounded to 8 digits unless roundOff=false.
Examples:
> SELECT months_between('1997-02-28 10:30:00', '1996-10-30');
3.94959677
> SELECT months_between('1997-02-28 10:30:00', '1996-10-30', false);
3.9495967741935485
Since: 1.5.0
named_struct
named_struct(name1, val1, name2, val2, ...) - Creates a struct with the given field names and values.
Examples:
> SELECT named_struct("a", 1, "b", 2, "c", 3);
{"a":1,"b":2,"c":3}
nanvl
nanvl(expr1, expr2) - Returns expr1 if it's not NaN, or expr2 otherwise.
Examples:
> SELECT nanvl(cast('NaN' as double), 123);
123.0
Since: 1.5.0
negative
negative(expr) - Returns the negated value of expr.
Examples:
> SELECT negative(1);
-1
next_day
next_day(start_date, day_of_week) - Returns the first date which is later than start_date and named as indicated.
Examples:
> SELECT next_day('2015-01-14', 'TU');
2015-01-20
Since: 1.5.0
not
not expr - Logical not.
now
now() - Returns the current timestamp at the start of query evaluation.
Since: 1.5.0
ntile
ntile(n) - Divides the rows for each window partition into n buckets ranging from 1 to at most n.
nullif
nullif(expr1, expr2) - Returns null if expr1 equals to expr2, or expr1 otherwise.
Examples:
> SELECT nullif(2, 2);
NULL
Since: 2.0.0
nvl
nvl(expr1, expr2) - Returns expr2 if expr1 is null, or expr1 otherwise.
Examples:
> SELECT nvl(NULL, array('2'));
["2"]Since: 2.0.0
nvl2
nvl2(expr1, expr2, expr3) - Returns expr2 if expr1 is not null, or expr3 otherwise.
Examples:
> SELECT nvl2(NULL, 2, 1);
1
Since: 2.0.0
octet_length
octet_length(expr) - Returns the byte length of string data or number of bytes of binary data.
Examples:
> SELECT octet_length('Spark SQL');
9
Since: 2.3.0
or
expr1 or expr2 - Logical OR.
parse_url
parse_url(url, partToExtract[, key]) - Extracts a part from a URL.
Examples:
> SELECT parse_url('http://spark.apache.org/path?query=1', 'HOST')
spark.apache.org
> SELECT parse_url('http://spark.apache.org/path?query=1', 'QUERY')
query=1
> SELECT parse_url('http://spark.apache.org/path?query=1', 'QUERY', 'query')
1
Since: 2.0.0
percent_rank
percent_rank() - Computes the percentage ranking of a value in a group of values.
percentile
percentile(col, percentage [, frequency]) - Returns the exact percentile value of numeric column col at the given percentage. The value of percentage must be between 0.0 and 1.0. The value of frequency should be positive integral
percentile(col, array(percentage1 [, percentage2]...) [, frequency]) - Returns the exact percentile value array of numeric column col at the given percentage(s). Each value of the percentage array must be between 0.0 and 1.0. The value of frequency should be positive integral
percentile_approx
percentile_approx(col, percentage [, accuracy]) - Returns the approximate percentile value of numeric column col at the given percentage. The value of percentage must be between 0.0 and 1.0. The accuracy parameter (default: 10000) is a positive numeric literal which controls approximation accuracy at the cost of memory. Higher value of accuracy yields better accuracy, 1.0/accuracy is the relative error of the approximation. When percentage is an array, each value of the percentage array must be between 0.0 and 1.0. In this case, returns the approximate percentile array of column col at the given percentage array.
Examples:
> SELECT percentile_approx(10.0, array(0.5, 0.4, 0.1), 100);
[10.0,10.0,10.0]
> SELECT percentile_approx(10.0, 0.5, 100);
10.0
pi
pi() - Returns pi.
Examples:
> SELECT pi();
3.141592653589793
pmod
pmod(expr1, expr2) - Returns the positive value of expr1 mod expr2.
Examples:
> SELECT pmod(10, 3);
1
> SELECT pmod(-10, 3);
2
posexplode
posexplode(expr) - Separates the elements of array expr into multiple rows with positions, or the elements of map expr into multiple rows and columns with positions.
Examples:
> SELECT posexplode(array(10,20));
0 10
1 20
posexplode_outer
posexplode_outer(expr) - Separates the elements of array expr into multiple rows with positions, or the elements of map expr into multiple rows and columns with positions.
Examples:
> SELECT posexplode_outer(array(10,20));
0 10
1 20
position
position(substr, str[, pos]) - Returns the position of the first occurrence of substr in str after position pos. The given pos and return value are 1-based.
Examples:
> SELECT position('bar', 'foobarbar');
4
> SELECT position('bar', 'foobarbar', 5);
7
> SELECT POSITION('bar' IN 'foobarbar');
4
Since: 1.5.0
positive
positive(expr) - Returns the value of expr.
pow
pow(expr1, expr2) - Raises expr1 to the power of expr2.
Examples:
> SELECT pow(2, 3);
8.0
power
power(expr1, expr2) - Raises expr1 to the power of expr2.
Examples:
> SELECT power(2, 3);
8.0
printf
printf(strfmt, obj, ...) - Returns a formatted string from printf-style format strings.
Examples:
> SELECT printf("Hello World %d %s", 100, "days");
Hello World 100 days
Since: 1.5.0
quarter
quarter(date) - Returns the quarter of the year for date, in the range 1 to 4.
Examples:
> SELECT quarter('2016-08-31');
3
Since: 1.5.0
radians
radians(expr) - Converts degrees to radians.
Arguments:
- expr - angle in degrees
Examples:
> SELECT radians(180);
3.141592653589793
rand
rand([seed]) - Returns a random value with independent and identically distributed (i.i.d.) uniformly distributed values in [0, 1).
Examples:
> SELECT rand();
0.9629742951434543
> SELECT rand(0);
0.8446490682263027
> SELECT rand(null);
0.8446490682263027
Note: function is non-deterministic in general case. Since: 1.5.0
randn
randn([seed]) - Returns a random value with independent and identically distributed (i.i.d.) values drawn from the standard normal distribution.
Examples:
> SELECT randn();
-0.3254147983080288
> SELECT randn(0);
1.1164209726833079
> SELECT randn(null);
1.1164209726833079
Note: function is non-deterministic in general case. Since: 1.5.0
rank
rank() - Computes the rank of a value in a group of values. The result is one plus the number of rows preceding or equal to the current row in the ordering of the partition. The values will produce gaps in the sequence.
reflect
reflect(class, method[, arg1[, arg2 ..]]) - Calls a method with reflection.
Examples:
> SELECT reflect('java.util.UUID', 'randomUUID');
c33fb387-8500-4bfa-81d2-6e0e3e930df2
> SELECT reflect('java.util.UUID', 'fromString', 'a5cf6c42-0c85-418f-af6c-3e4e5b1328f2');
a5cf6c42-0c85-418f-af6c-3e4e5b1328f2
regexp_extract
regexp_extract(str, regexp[, idx]) - Extracts a group that matches regexp.
Examples:
> SELECT regexp_extract('100-200', '(\\d+)-(\\d+)', 1);
100
Since: 1.5.0
regexp_replace
regexp_replace(str, regexp, rep) - Replaces all substrings of str that match regexp with rep.
Examples:
> SELECT regexp_replace('100-200', '(\\d+)', 'num');
num-num
Since: 1.5.0
repeat
repeat(str, n) - Returns the string which repeats the given string value n times.
Examples:
> SELECT repeat('123', 2);
123123
Since: 1.5.0
replace
replace(str, search[, replace]) - Replaces all occurrences of search with replace.
Arguments:
- str - a string expression
- search - a string expression. If
searchis not found instr,stris returned unchanged. - replace - a string expression. If
replaceis not specified or is an empty string, nothing replaces the string that is removed fromstr.
Examples:
> SELECT replace('ABCabc', 'abc', 'DEF');
ABCDEF
Since: 2.3.0
reverse
reverse(array) - Returns a reversed string or an array with reverse order of elements.
Examples:
> SELECT reverse('Spark SQL');
LQS krapS
> SELECT reverse(array(2, 1, 4, 3));
[3,4,1,2]
Note: rse logic for arrays is available since 2.4.0. Since: 1.5.0
right
right(str, len) - Returns the rightmost len(len can be string type) characters from the string str,if len is less or equal than 0 the result is an empty string.
Examples:
> SELECT right('Spark SQL', 3);
SQL
Since: 2.3.0
rint
rint(expr) - Returns the double value that is closest in value to the argument and is equal to a mathematical integer.
Examples:
> SELECT rint(12.3456);
12.0
rlike
str rlike regexp - Returns true if str matches regexp, or false otherwise.
Arguments:
- str - a string expression
-
regexp - a string expression. The pattern string should be a Java regular expression.
Since Spark 2.0, string literals (including regex patterns) are unescaped in our SQL parser. For example, to match "\abc", a regular expression for
regexpcan be "^\abc$".There is a SQL config 'spark.sql.parser.escapedStringLiterals' that can be used to fallback to the Spark 1.6 behavior regarding string literal parsing. For example, if the config is enabled, the
regexpthat can match "\abc" is "^\abc$".
Examples:
When spark.sql.parser.escapedStringLiterals is disabled (default).
> SELECT '%SystemDrive%\Users\John' rlike '%SystemDrive%\\Users.*'
true
When spark.sql.parser.escapedStringLiterals is enabled.
> SELECT '%SystemDrive%\Users\John' rlike '%SystemDrive%\Users.*'
true
Note:
Use LIKE to match with simple string pattern.
Since: 1.0.0
rollup
rollup([col1[, col2 ..]]) - create a multi-dimensional rollup using the specified columns so that we can run aggregation on them.
Examples:
> SELECT name, age, count(*) FROM VALUES (2, 'Alice'), (5, 'Bob') people(age, name) GROUP BY rollup(name, age);
NULL NULL 2
Alice 2 1
Bob 5 1
Bob NULL 1
Alice NULL 1
Since: 2.0.0
round
round(expr, d) - Returns expr rounded to d decimal places using HALF_UP rounding mode.
Examples:
> SELECT round(2.5, 0);
3.0
row_number
row_number() - Assigns a unique, sequential number to each row, starting with one, according to the ordering of rows within the window partition.
rpad
rpad(str, len, pad) - Returns str, right-padded with pad to a length of len. If str is longer than len, the return value is shortened to len characters.
Examples:
> SELECT rpad('hi', 5, '??');
hi???
> SELECT rpad('hi', 1, '??');
h
Since: 1.5.0
rtrim
rtrim(str) - Removes the trailing space characters from str.
rtrim(trimStr, str) - Removes the trailing string which contains the characters from the trim string from the str
Arguments:
- str - a string expression
- trimStr - the trim string characters to trim, the default value is a single space
Examples:
> SELECT rtrim(' SparkSQL ');
SparkSQL
> SELECT rtrim('LQSa', 'SSparkSQLS');
SSpark
Since: 1.5.0
schema_of_json
schema_of_json(json[, options]) - Returns schema in the DDL format of JSON string.
Examples:
> SELECT schema_of_json('[{"col":0}]');
array<struct<col:int>>
Since: 2.4.0
second
second(timestamp) - Returns the second component of the string/timestamp.
Examples:
> SELECT second('2009-07-30 12:58:59');
59
Since: 1.5.0
sentences
sentences(str[, lang, country]) - Splits str into an array of array of words.
Examples:
> SELECT sentences('Hi there! Good morning.');
[["Hi","there"],["Good","morning"]]
Since: 2.0.0
sequence
sequence(start, stop, step) - Generates an array of elements from start to stop (inclusive), incrementing by step. The type of the returned elements is the same as the type of argument expressions.
Supported types are: byte, short, integer, long, date, timestamp.
The start and stop expressions must resolve to the same type. If start and stop expressions resolve to the 'date' or 'timestamp' type then the step expression must resolve to the 'interval' type, otherwise to the same type as the start and stop expressions.
Arguments:
- start - an expression. The start of the range.
- stop - an expression. The end the range (inclusive).
- step - an optional expression. The step of the range. By default step is 1 if start is less than or equal to stop, otherwise -1. For the temporal sequences it's 1 day and -1 day respectively. If start is greater than stop then the step must be negative, and vice versa.
Examples:
> SELECT sequence(1, 5);
[1,2,3,4,5]
> SELECT sequence(5, 1);
[5,4,3,2,1]
> SELECT sequence(to_date('2018-01-01'), to_date('2018-03-01'), interval 1 month);
[2018-01-01,2018-02-01,2018-03-01]
Since: 2.4.0
sha
sha(expr) - Returns a sha1 hash value as a hex string of the expr.
Examples:
> SELECT sha('Spark');
85f5955f4b27a9a4c2aab6ffe5d7189fc298b92c
sha1
sha1(expr) - Returns a sha1 hash value as a hex string of the expr.
Examples:
> SELECT sha1('Spark');
85f5955f4b27a9a4c2aab6ffe5d7189fc298b92c
sha2
sha2(expr, bitLength) - Returns a checksum of SHA-2 family as a hex string of expr. SHA-224, SHA-256, SHA-384, and SHA-512 are supported. Bit length of 0 is equivalent to 256.
Examples:
> SELECT sha2('Spark', 256);
529bc3b07127ecb7e53a4dcf1991d9152c24537d919178022b2c42657f79a26b
shiftleft
shiftleft(base, expr) - Bitwise left shift.
Examples:
> SELECT shiftleft(2, 1);
4
shiftright
shiftright(base, expr) - Bitwise (signed) right shift.
Examples:
> SELECT shiftright(4, 1);
2
shiftrightunsigned
shiftrightunsigned(base, expr) - Bitwise unsigned right shift.
Examples:
> SELECT shiftrightunsigned(4, 1);
2
shuffle
shuffle(array) - Returns a random permutation of the given array.
Examples:
> SELECT shuffle(array(1, 20, 3, 5));
[3,1,5,20]
> SELECT shuffle(array(1, 20, null, 3));
[20,null,3,1]
Note: function is non-deterministic. Since: 2.4.0
sign
sign(expr) - Returns -1.0, 0.0 or 1.0 as expr is negative, 0 or positive.
Examples:
> SELECT sign(40);
1.0
signum
signum(expr) - Returns -1.0, 0.0 or 1.0 as expr is negative, 0 or positive.
Examples:
> SELECT signum(40);
1.0
sin
sin(expr) - Returns the sine of expr, as if computed by java.lang.Math.sin.
Arguments:
- expr - angle in radians
Examples:
> SELECT sin(0);
0.0
sinh
sinh(expr) - Returns hyperbolic sine of expr, as if computed by java.lang.Math.sinh.
Arguments:
- expr - hyperbolic angle
Examples:
> SELECT sinh(0);
0.0
size
size(expr) - Returns the size of an array or a map. The function returns -1 if its input is null and spark.sql.legacy.sizeOfNull is set to true. If spark.sql.legacy.sizeOfNull is set to false, the function returns null for null input. By default, the spark.sql.legacy.sizeOfNull parameter is set to true.
Examples:
> SELECT size(array('b', 'd', 'c', 'a'));
4
> SELECT size(map('a', 1, 'b', 2));
2
> SELECT size(NULL);
-1
skewness
skewness(expr) - Returns the skewness value calculated from values of a group.
slice
slice(x, start, length) - Subsets array x starting from index start (array indices start at 1, or starting from the end if start is negative) with the specified length.
Examples:
> SELECT slice(array(1, 2, 3, 4), 2, 2);
[2,3]
> SELECT slice(array(1, 2, 3, 4), -2, 2);
[3,4]
Since: 2.4.0
smallint
smallint(expr) - Casts the value expr to the target data type smallint.
sort_array
sort_array(array[, ascendingOrder]) - Sorts the input array in ascending or descending order according to the natural ordering of the array elements. Null elements will be placed at the beginning of the returned array in ascending order or at the end of the returned array in descending order.
Examples:
> SELECT sort_array(array('b', 'd', null, 'c', 'a'), true);
[null,"a","b","c","d"]
soundex
soundex(str) - Returns Soundex code of the string.
Examples:
> SELECT soundex('Miller');
M460
Since: 1.5.0
space
space(n) - Returns a string consisting of n spaces.
Examples:
> SELECT concat(space(2), '1');
1
Since: 1.5.0
spark_partition_id
spark_partition_id() - Returns the current partition id.
split
split(str, regex) - Splits str around occurrences that match regex.
Examples:
> SELECT split('oneAtwoBthreeC', '[ABC]');
["one","two","three",""]
Since: 1.5.0
sqrt
sqrt(expr) - Returns the square root of expr.
Examples:
> SELECT sqrt(4);
2.0
stack
stack(n, expr1, ..., exprk) - Separates expr1, ..., exprk into n rows.
Examples:
> SELECT stack(2, 1, 2, 3);
1 2
3 NULL
std
std(expr) - Returns the sample standard deviation calculated from values of a group.
stddev
stddev(expr) - Returns the sample standard deviation calculated from values of a group.
stddev_pop
stddev_pop(expr) - Returns the population standard deviation calculated from values of a group.
stddev_samp
stddev_samp(expr) - Returns the sample standard deviation calculated from values of a group.
str_to_map
str_to_map(text[, pairDelim[, keyValueDelim]]) - Creates a map after splitting the text into key/value pairs using delimiters. Default delimiters are ',' for pairDelim and ':' for keyValueDelim.
Examples:
> SELECT str_to_map('a:1,b:2,c:3', ',', ':');
map("a":"1","b":"2","c":"3")
> SELECT str_to_map('a');
map("a":null)
string
string(expr) - Casts the value expr to the target data type string.
struct
struct(col1, col2, col3, ...) - Creates a struct with the given field values.
substr
substr(str, pos[, len]) - Returns the substring of str that starts at pos and is of length len, or the slice of byte array that starts at pos and is of length len.
Examples:
> SELECT substr('Spark SQL', 5);
k SQL
> SELECT substr('Spark SQL', -3);
SQL
> SELECT substr('Spark SQL', 5, 1);
k
Since: 1.5.0
substring
substring(str, pos[, len]) - Returns the substring of str that starts at pos and is of length len, or the slice of byte array that starts at pos and is of length len.
Examples:
> SELECT substring('Spark SQL', 5);
k SQL
> SELECT substring('Spark SQL', -3);
SQL
> SELECT substring('Spark SQL', 5, 1);
k
Since: 1.5.0
substring_index
substring_index(str, delim, count) - Returns the substring from str before count occurrences of the delimiter delim. If count is positive, everything to the left of the final delimiter (counting from the left) is returned. If count is negative, everything to the right of the final delimiter (counting from the right) is returned. The function substring_index performs a case-sensitive match when searching for delim.
Examples:
> SELECT substring_index('www.apache.org', '.', 2);
www.apache
Since: 1.5.0
sum
sum(expr) - Returns the sum calculated from values of a group.
tan
tan(expr) - Returns the tangent of expr, as if computed by java.lang.Math.tan.
Arguments:
- expr - angle in radians
Examples:
> SELECT tan(0);
0.0
tanh
tanh(expr) - Returns the hyperbolic tangent of expr, as if computed by java.lang.Math.tanh.
Arguments:
- expr - hyperbolic angle
Examples:
> SELECT tanh(0);
0.0
timestamp
timestamp(expr) - Casts the value expr to the target data type timestamp.
tinyint
tinyint(expr) - Casts the value expr to the target data type tinyint.
to_date
to_date(date_str[, fmt]) - Parses the date_str expression with the fmt expression to a date. Returns null with invalid input. By default, it follows casting rules to a date if the fmt is omitted.
Arguments:
- date_str - A string to be parsed to date.
- fmt - Date format pattern to follow. See
java.text.SimpleDateFormatfor valid date and time format patterns.
Examples:
> SELECT to_date('2009-07-30 04:17:52');
2009-07-30
> SELECT to_date('2016-12-31', 'yyyy-MM-dd');
2016-12-31
Since: 1.5.0
to_json
to_json(expr[, options]) - Returns a JSON string with a given struct value
Examples:
> SELECT to_json(named_struct('a', 1, 'b', 2));
{"a":1,"b":2}
> SELECT to_json(named_struct('time', to_timestamp('2015-08-26', 'yyyy-MM-dd')), map('timestampFormat', 'dd/MM/yyyy'));
{"time":"26/08/2015"}
> SELECT to_json(array(named_struct('a', 1, 'b', 2)));
[{"a":1,"b":2}]
> SELECT to_json(map('a', named_struct('b', 1)));
{"a":{"b":1}}
> SELECT to_json(map(named_struct('a', 1),named_struct('b', 2)));
{"[1]":{"b":2}}
> SELECT to_json(map('a', 1));
{"a":1}
> SELECT to_json(array((map('a', 1))));
[{"a":1}]
Since: 2.2.0
to_timestamp
to_timestamp(timestamp_str[, fmt]) - Parses the timestamp_str expression with the fmt expression to a timestamp. Returns null with invalid input. By default, it follows casting rules to a timestamp if the fmt is omitted.
Arguments:
- timestamp_str - A string to be parsed to timestamp.
- fmt - Timestamp format pattern to follow. See
java.text.SimpleDateFormatfor valid date and time format patterns.
Examples:
> SELECT to_timestamp('2016-12-31 00:12:00');
2016-12-31 00:12:00
> SELECT to_timestamp('2016-12-31', 'yyyy-MM-dd');
2016-12-31 00:00:00
Since: 2.2.0
to_unix_timestamp
to_unix_timestamp(timeExp[, format]) - Returns the UNIX timestamp of the given time.
Arguments:
- timeExp - A date/timestamp or string which is returned as a UNIX timestamp.
- format - Date/time format pattern to follow. Ignored if
timeExpis not a string. Default value is "yyyy-MM-dd HH:mm:ss". Seejava.text.SimpleDateFormatfor valid date and time format patterns.
Examples:
> SELECT to_unix_timestamp('2016-04-08', 'yyyy-MM-dd');
1460041200
Since: 1.6.0
to_utc_timestamp
to_utc_timestamp(timestamp, timezone) - Given a timestamp like '2017-07-14 02:40:00.0', interprets it as a time in the given time zone, and renders that time as a timestamp in UTC. For example, 'GMT+1' would yield '2017-07-14 01:40:00.0'.
Examples:
> SELECT to_utc_timestamp('2016-08-31', 'Asia/Seoul');
2016-08-30 15:00:00
Since: 1.5.0
transform
transform(expr, func) - Transforms elements in an array using the function.
Examples:
> SELECT transform(array(1, 2, 3), x -> x + 1);
[2,3,4]
> SELECT transform(array(1, 2, 3), (x, i) -> x + i);
[1,3,5]
Since: 2.4.0
translate
translate(input, from, to) - Translates the input string by replacing the characters present in the from string with the corresponding characters in the to string.
Examples:
> SELECT translate('AaBbCc', 'abc', '123');
A1B2C3
Since: 1.5.0
trim
trim(str) - Removes the leading and trailing space characters from str.
trim(BOTH trimStr FROM str) - Remove the leading and trailing trimStr characters from str
trim(LEADING trimStr FROM str) - Remove the leading trimStr characters from str
trim(TRAILING trimStr FROM str) - Remove the trailing trimStr characters from str
Arguments:
- str - a string expression
- trimStr - the trim string characters to trim, the default value is a single space
- BOTH, FROM - these are keywords to specify trimming string characters from both ends of the string
- LEADING, FROM - these are keywords to specify trimming string characters from the left end of the string
- TRAILING, FROM - these are keywords to specify trimming string characters from the right end of the string
Examples:
> SELECT trim(' SparkSQL ');
SparkSQL
> SELECT trim('SL', 'SSparkSQLS');
parkSQ
> SELECT trim(BOTH 'SL' FROM 'SSparkSQLS');
parkSQ
> SELECT trim(LEADING 'SL' FROM 'SSparkSQLS');
parkSQLS
> SELECT trim(TRAILING 'SL' FROM 'SSparkSQLS');
SSparkSQ
Since: 1.5.0
trunc
trunc(date, fmt) - Returns date with the time portion of the day truncated to the unit specified by the format model fmt. fmt should be one of ["year", "yyyy", "yy", "mon", "month", "mm"]
Examples:
> SELECT trunc('2009-02-12', 'MM');
2009-02-01
> SELECT trunc('2015-10-27', 'YEAR');
2015-01-01
Since: 1.5.0
ucase
ucase(str) - Returns str with all characters changed to uppercase.
Examples:
> SELECT ucase('SparkSql');
SPARKSQL
Since: 1.0.1
unbase64
unbase64(str) - Converts the argument from a base 64 string str to a binary.
Examples:
> SELECT unbase64('U3BhcmsgU1FM');
Spark SQL
Since: 1.5.0
unhex
unhex(expr) - Converts hexadecimal expr to binary.
Examples:
> SELECT decode(unhex('537061726B2053514C'), 'UTF-8');
Spark SQL
unix_timestamp
unix_timestamp([timeExp[, format]]) - Returns the UNIX timestamp of current or specified time.
Arguments:
- timeExp - A date/timestamp or string. If not provided, this defaults to current time.
- format - Date/time format pattern to follow. Ignored if
timeExpis not a string. Default value is "yyyy-MM-dd HH:mm:ss". Seejava.text.SimpleDateFormatfor valid date and time format patterns.
Examples:
> SELECT unix_timestamp();
1476884637
> SELECT unix_timestamp('2016-04-08', 'yyyy-MM-dd');
1460041200
Since: 1.5.0
upper
upper(str) - Returns str with all characters changed to uppercase.
Examples:
> SELECT upper('SparkSql');
SPARKSQL
Since: 1.0.1
uuid
uuid() - Returns an universally unique identifier (UUID) string. The value is returned as a canonical UUID 36-character string.
Examples:
> SELECT uuid();
46707d92-02f4-4817-8116-a4c3b23e6266
Note: function is non-deterministic.
var_pop
var_pop(expr) - Returns the population variance calculated from values of a group.
var_samp
var_samp(expr) - Returns the sample variance calculated from values of a group.
variance
variance(expr) - Returns the sample variance calculated from values of a group.
weekday
weekday(date) - Returns the day of the week for date/timestamp (0 = Monday, 1 = Tuesday, ..., 6 = Sunday).
Examples:
> SELECT weekday('2009-07-30');
3
Since: 2.4.0
weekofyear
weekofyear(date) - Returns the week of the year of the given date. A week is considered to start on a Monday and week 1 is the first week with >3 days.
Examples:
> SELECT weekofyear('2008-02-20');
8
Since: 1.5.0
when
CASE WHEN expr1 THEN expr2 [WHEN expr3 THEN expr4]* [ELSE expr5] END - When expr1 = true, returns expr2; else when expr3 = true, returns expr4; else returns expr5.
Arguments:
- expr1, expr3 - the branch condition expressions should all be boolean type.
- expr2, expr4, expr5 - the branch value expressions and else value expression should all be same type or coercible to a common type.
Examples:
> SELECT CASE WHEN 1 > 0 THEN 1 WHEN 2 > 0 THEN 2.0 ELSE 1.2 END;
1
> SELECT CASE WHEN 1 < 0 THEN 1 WHEN 2 > 0 THEN 2.0 ELSE 1.2 END;
2
> SELECT CASE WHEN 1 < 0 THEN 1 WHEN 2 < 0 THEN 2.0 END;
NULL
window
xpath
xpath(xml, xpath) - Returns a string array of values within the nodes of xml that match the XPath expression.
Examples:
> SELECT xpath('<a><b>b1</b><b>b2</b><b>b3</b><c>c1</c><c>c2</c></a>','a/b/text()');
['b1','b2','b3']
xpath_boolean
xpath_boolean(xml, xpath) - Returns true if the XPath expression evaluates to true, or if a matching node is found.
Examples:
> SELECT xpath_boolean('<a><b>1</b></a>','a/b');
true
xpath_double
xpath_double(xml, xpath) - Returns a double value, the value zero if no match is found, or NaN if a match is found but the value is non-numeric.
Examples:
> SELECT xpath_double('<a><b>1</b><b>2</b></a>', 'sum(a/b)');
3.0
xpath_float
xpath_float(xml, xpath) - Returns a float value, the value zero if no match is found, or NaN if a match is found but the value is non-numeric.
Examples:
> SELECT xpath_float('<a><b>1</b><b>2</b></a>', 'sum(a/b)');
3.0
xpath_int
xpath_int(xml, xpath) - Returns an integer value, or the value zero if no match is found, or a match is found but the value is non-numeric.
Examples:
> SELECT xpath_int('<a><b>1</b><b>2</b></a>', 'sum(a/b)');
3
xpath_long
xpath_long(xml, xpath) - Returns a long integer value, or the value zero if no match is found, or a match is found but the value is non-numeric.
Examples:
> SELECT xpath_long('<a><b>1</b><b>2</b></a>', 'sum(a/b)');
3
xpath_number
xpath_number(xml, xpath) - Returns a double value, the value zero if no match is found, or NaN if a match is found but the value is non-numeric.
Examples:
> SELECT xpath_number('<a><b>1</b><b>2</b></a>', 'sum(a/b)');
3.0
xpath_short
xpath_short(xml, xpath) - Returns a short integer value, or the value zero if no match is found, or a match is found but the value is non-numeric.
Examples:
> SELECT xpath_short('<a><b>1</b><b>2</b></a>', 'sum(a/b)');
3
xpath_string
xpath_string(xml, xpath) - Returns the text contents of the first xml node that matches the XPath expression.
Examples:
> SELECT xpath_string('<a><b>b</b><c>cc</c></a>','a/c');
cc
year
year(date) - Returns the year component of the date/timestamp.
Examples:
> SELECT year('2016-07-30');
2016
Since: 1.5.0
zip_with
zip_with(left, right, func) - Merges the two given arrays, element-wise, into a single array using function. If one array is shorter, nulls are appended at the end to match the length of the longer array, before applying function.
Examples:
> SELECT zip_with(array(1, 2, 3), array('a', 'b', 'c'), (x, y) -> (y, x));
[{"y":"a","x":1},{"y":"b","x":2},{"y":"c","x":3}]
> SELECT zip_with(array(1, 2), array(3, 4), (x, y) -> x + y);
[4,6]
> SELECT zip_with(array('a', 'b', 'c'), array('d', 'e', 'f'), (x, y) -> concat(x, y));
["ad","be","cf"]
Since: 2.4.0
|
expr1 | expr2 - Returns the result of bitwise OR of expr1 and expr2.
Examples:
> SELECT 3 | 5;
7
~
~ expr - Returns the result of bitwise NOT of expr.
Examples:
> SELECT ~ 0;
-1
出自官网：http://spark.apache.org/docs/latest/api/sql/index.html#zip_with
