swuferhong commented on code in PR #22049:
URL: https://github.com/apache/flink/pull/22049#discussion_r1135073462
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flink-table/flink-table-planner/src/test/resources/org/apache/flink/table/planner/plan/batch/sql/MultipleInputCreationTest.xml:
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@@ -136,11 +136,9 @@ LogicalProject(a=[$0], d=[$1], e=[$2], f=[$3], ny=[$4],
a0=[$5], b=[$6], c=[$7])
<![CDATA[
MultipleInput(readOrder=[0,0,1],
members=[\nNestedLoopJoin(joinType=[LeftOuterJoin], where=[(a = a0)],
select=[a, d, e, f, ny, a0, b, c], build=[right])\n:-
NestedLoopJoin(joinType=[LeftOuterJoin], where=[(a = d)], select=[a, d, e, f,
ny], build=[right])\n: :- Calc(select=[a], where=[(a > 10)])\n: : +- [#3]
BoundedStreamScan(table=[[default_catalog, default_database, chainable]],
fields=[a])\n: +- [#2] Exchange(distribution=[broadcast])\n+- [#1]
Exchange(distribution=[broadcast])\n])
:- Exchange(distribution=[broadcast])
-: +- Calc(select=[a, b, c], where=[(a > 10)])
Review Comment:
> why the left side filters can not be pushed down ?
this case is :
`SELECT * FROM chainable
LEFT JOIN y ON chainable.a = y.d
LEFT JOIN t ON chainable.a = t.a
WHERE chainable.a > 10`
It will be push down to chainable, but don‘t push down to y and t.
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