Lyn Zhang created FLINK-24504:
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Summary: Flink udf common expression elimination
Key: FLINK-24504
URL: https://issues.apache.org/jira/browse/FLINK-24504
Project: Flink
Issue Type: Improvement
Components: Table SQL / Planner
Affects Versions: 1.14.0
Reporter: Lyn Zhang
Flink sql user define function can not reuse common expression.
For example the sql: SELECT split(a, '_')[1], split(a, '_')[2] FROM table.
The function split(a, '_') will be invoked 2 times, We can improve it.
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