记一次Flink TableAPI使用的小坑

废话不多说直接上代码：
cat info.txt
s_1,1547718120,32.1
s_6,1547718297,17.8
s_7,1547718299,9.5
s_10,1547718205,39.1
s_1,1547718207,37.2
s_3,1547718215,35.6
s_1,1547718217,39.4
s_10,1547718205,40.1
--------分割线----------------------

package com.flink.study.tableapi

import org.apache.flink.streaming.api.scala._
import org.apache.flink.table.api.scala._
import org.apache.flink.table.api.{EnvironmentSettings, Table}

object TableApiTest01 {

  def main(args: Array[String]): Unit = {
    val env: StreamExecutionEnvironment = StreamExecutionEnvironment.getExecutionEnvironment
    env.setParallelism(1)

    val inputstream: DataStream[String] = env.readTextFile("D:\\flink-demo\\src\\main\\resources\\info.txt")
    val dataStream: DataStream[SensorReading] = inputstream.map(item => {
      val dataArray: Array[String] = item.split(",")
      InfoReading(dataArray(0).trim, dataArray(1).trim.toLong, dataArray(2).trim.toDouble)
    })

    val settings: EnvironmentSettings = EnvironmentSettings.newInstance().useOldPlanner().inStreamingMode().build()
    val tableEnv: StreamTableEnvironment = StreamTableEnvironment.create(env, settings)
    val table: Table = tableEnv.fromDataStream(dataStream)
    //val selectTable: Table = table.select("id, temperature").filter("id = 's_3'")

    val selectTable: Table = tableEnv.sqlQuery("select id, temperature from " + table + "where id = 's_1'")

    val selectStream: DataStream[(String, Double)] = selectTable.toAppendStream[(String, Double)]

    println("--------------------------------------------")
    selectStream.print()

    env.execute("flink tableapi test.")

  }

}

case class InfoReading( id: String, timestamp: Long, temperature: Double )

异常信息如下：

Connected to the target VM, address: '127.0.0.1:0', transport: 'socket'
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Exception in thread "main" org.apache.flink.table.api.SqlParserException: SQL parse failed.*** *  Encountered "=" at line 1, column 52.**
Was expecting one of:
    <EOF> 
    "EXCEPT" ...
    "FETCH" ...
    "GROUP" ...
    "HAVING" ...
    "INTERSECT" ...
    "LIMIT" ...
    "OFFSET" ...
    "ORDER" ...
    "MINUS" ...
    "TABLESAMPLE" ...
    "UNION" ...
    "WHERE" ...
    "WINDOW" ...
    "(" ...
    "NATURAL" ...
    "JOIN" ...
    "INNER" ...
    "LEFT" ...
    "RIGHT" ...
    "FULL" ...
    "CROSS" ...
    "," ...
    "OUTER" ...
    
	at org.apache.flink.table.calcite.CalciteParser.parse(CalciteParser.java:50)
	at org.apache.flink.table.planner.ParserImpl.parse(ParserImpl.java:64)
	at org.apache.flink.table.api.internal.TableEnvironmentImpl.sqlQuery(TableEnvironmentImpl.java:464)
	at com.flink.study.tableapi.TableApiTest01$.main(TableApiTest01.scala:24)
	at com.flink.study.tableapi.TableApiTest01.main(TableApiTest01.scala)
Disconnected from the target VM, address: '127.0.0.1:0', transport: 'socket'

Process finished with exit code 1

刺激不，查找了好多资料没看到代码有什么问题呀，脑瓜疼······（自学狗，还找不到人问），然后一遍遍屡，一遍遍调试，终于找到了问题所在：

此处应该有空格，一时手快居然干掉了，一个小坑，记录一下。

SQL不规范，亲人两行泪。