[jira] [Created] (FLINK-20756) PythonCalcSplitConditionRule is not working as expected

[Shang Yuanchun (Jira)]

Wei Zhong created FLINK-20756:
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             Summary: PythonCalcSplitConditionRule is not working as expected
                 Key: FLINK-20756
                 URL: https://issues.apache.org/jira/browse/FLINK-20756
             Project: Flink
          Issue Type: Bug
            Reporter: Wei Zhong


Currently if users write such a SQL:

`SELECT pyFunc5(f0, f1) FROM (SELECT e.f0, e.f1 FROM (SELECT pyFunc5(a) as e FROM MyTable) where e.f0 is NULL)`

It will be optimized to:

`FlinkLogicalCalc(select=[pyFunc5(pyFunc5(a)) AS f0])
+- FlinkLogicalCalc(select=[a], where=[IS NULL(pyFunc5(a).f0)])
 +- FlinkLogicalLegacyTableSourceScan(table=[[default_catalog, default_database, MyTable, source: [TestTableSource(a, b, c, d)]]], fields=[a, b, c, d])`

The optimized plan is not runnable, we need to fix this.



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