[jira] [Created] (FLINK-15441) Refactor StreamExecWindowJoin to extends CommonPhysicalJoin

["Jark Wu (Jira)" <ji...@apache.org>]

Jark Wu created FLINK-15441:
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             Summary: Refactor StreamExecWindowJoin to extends CommonPhysicalJoin
                 Key: FLINK-15441
                 URL: https://issues.apache.org/jira/browse/FLINK-15441
             Project: Flink
          Issue Type: Improvement
          Components: Table SQL / Planner
            Reporter: Jark Wu


Currently, {{StreamExecWindowJoin}} put join keys in the {{remainCondition}}, this will generate redundant condition for join keys, and results in [this code branch |https://github.com/apache/flink/blob/master/flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/plan/utils/WindowJoinUtil.scala#L128] is never reached. 

I better desgin is have a new {{joinCondition}} which removes the window bounds condition, and generate condition for non-equal conditions in {{joinCondition}}, and make {{StreamExecWindowJoin}} extends {{CommonPhysicalJoin}} . We should also take filter null join keys into account. 



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