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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