[jira] [Created] (FLINK-15973) Optimize the execution plan where it refers the Python UDF result field in the where clause

["Dian Fu (Jira)" <ji...@apache.org>]

Dian Fu created FLINK-15973:
-------------------------------

             Summary: Optimize the execution plan where it refers the Python UDF result field in the where clause
                 Key: FLINK-15973
                 URL: https://issues.apache.org/jira/browse/FLINK-15973
             Project: Flink
          Issue Type: Improvement
          Components: API / Python
            Reporter: Dian Fu
             Fix For: 1.11.0


For the following job:
{code}
t_env.register_function("inc", inc)

table.select("inc(id) as inc_id") \
         .where("inc_id > 0") \
         .insert_into("sink")
{code}

The execution plan is as following:
{code}
StreamExecPythonCalc(select=inc(f0) AS inc_id))
+- StreamExecCalc(select=id AS f0, where=>(f0, 0))
+--- StreamExecPythonCalc(select=id, inc(f0) AS f0))
+-----StreamExecCalc(select=id, id AS f0))
+-------StreamExecTableSourceScan(fields=id)
{code}

The plan is not the best. It should be as following:
{code}
StreamExecPythonCalc(select=f0)
+- StreamExecCalc(select=f0, where=>(f0, 0))
+--- StreamExecPythonCalc(select=inc(f0) AS f0))
+-----StreamExecCalc(select=id, id AS f0))
+-------StreamExecTableSourceScan(fields=id)
{code}



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