cloudzhao created FLINK-17388:
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Summary: flink sql The custom function in ROW type is executed
multiple times
Key: FLINK-17388
URL: https://issues.apache.org/jira/browse/FLINK-17388
Project: Flink
Issue Type: Bug
Reporter: cloudzhao
val tableA = tableEnv.sqlQuery("select custom_func(a) as a, custom_func(b) as b
from tableS")
tableEnv.registerTable("tableA", tableA)
val tableB = tableEnv.sqlQuery("select ROW(a, b) as body from tableA")
tableEnv.registerTable("tableB", tableB)
val tableC = tableEnv.sqlQuery("select body.a, body.b from tableB")
In this logic, the custom_func is executed four times
tableC === select Row(custom_func(a) as a, custom_func(b) as b).a,
Row(custom_func(a) as a, custom_func(b) as b).b from tableS
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