[jira] [Created] (FLINK-31273) Left join with IS_NULL filter be wrongly pushed down and get wrong join results

["Yunhong Zheng (Jira)" <ji...@apache.org>]

Yunhong Zheng created FLINK-31273:
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             Summary: Left join with IS_NULL filter be wrongly pushed down and get wrong join results
                 Key: FLINK-31273
                 URL: https://issues.apache.org/jira/browse/FLINK-31273
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / Planner
    Affects Versions: 1.16.1, 1.17.0
            Reporter: Yunhong Zheng
             Fix For: 1.17.1


Left join with IS_NULL filter be wrongly pushed down and get wrong join results. The sql is:
{code:java}
SELECT * FROM MyTable1 LEFT JOIN MyTable2 ON a1 = a2 WHERE a2 IS NULL AND a1 < 10

The wrongly plan is:

LogicalProject(a1=[$0], b1=[$1], c1=[$2], b2=[$3], c2=[$4], a2=[$5])
+- LogicalFilter(condition=[IS NULL($5)])
   +- LogicalJoin(condition=[=($0, $5)], joinType=[left])
      :- LogicalValues(tuples=[[]])
      +- LogicalTableScan(table=[[default_catalog, default_database, MyTable2]]) {code}



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