snuyanzin commented on code in PR #29200:
URL: https://github.com/apache/flink/pull/29200#discussion_r4021043460


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flink-table/flink-table-planner/src/test/resources/explain/stream/join/lookup/testAggAndAllConstantLookupKeyWithTryResolveMode.out:
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@@ -12,7 +12,7 @@ LogicalSink(table=[default_catalog.default_database.Sink1], 
fields=[a, name, age
 
 == Optimized Physical Plan ==
 Sink(table=[default_catalog.default_database.Sink1], fields=[a, name, age])
-+- LookupJoin(table=[default_catalog.default_database.LookupTable], 
joinType=[LeftOuterJoin], lookup=[id=100], where=[=(id, 100)], select=[a, name, 
age], upsertMaterialize=[true])
++- LookupJoin(table=[default_catalog.default_database.LookupTable, filter=[]], 
joinType=[LeftOuterJoin], lookup=[id=100], where=[=(id, 100)], select=[a, name, 
age], upsertMaterialize=[true])

Review Comment:
   can we do not put empty collections here?



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