漏斗函数 模式
https://github.com/StarRocks/starrocks/blob/main/be/src/exprs/agg/window_funnel.h
enum FunnelMode : int { DEDUPLICATION = 1, FIXED = 2, DEDUPLICATION_FIXED = 3, INCREASE = 4 };
starrocks/fe/fe-core/src/test/java/com/starrocks/sql/plan/AggregateTest.java at main · StarRocks/starrocks https://github.com/StarRocks/starrocks/blob/main/fe/fe-core/src/test/java/com/starrocks/sql/plan/AggregateTest.java#L833
starrocks/fe/fe-core/src/test/java/com/starrocks/sql/analyzer/AnalyzeAggregateTest.java at main · StarRocks/starrocks https://github.com/StarRocks/starrocks/blob/main/fe/fe-core/src/test/java/com/starrocks/sql/analyzer/AnalyzeAggregateTest.java#L277
// Successful statements.
analyzeSuccess("SELECT window_funnel(1, ta, 0, [true, true, false]) FROM tall");
