godfreyhe commented on a change in pull request #11260:
[FLINK-16344][table-planner-blink] Preserve nullability for nested types
URL: https://github.com/apache/flink/pull/11260#discussion_r390072796
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File path:
flink-table/flink-table-planner-blink/src/main/scala/org/apache/flink/table/planner/calcite/FlinkTypeFactory.scala
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@@ -293,6 +293,11 @@ class FlinkTypeFactory(typeSystem: RelDataTypeSystem)
extends JavaTypeFactoryImp
case it: TimeIndicatorRelDataType =>
new TimeIndicatorRelDataType(it.typeSystem, it.originalType,
isNullable, it.isEventTime)
+ // for nested rows we keep the nullability property,
+ // top-level rows fall back to Calcite's default handling
+ case rt: RelRecordType if rt.getStructKind ==
StructKind.PEEK_FIELDS_NO_EXPAND =>
Review comment:
Make sense to me. I also notice `outer joins` is mentioned in
`RelDataTypeFactoryImpl#copyRecordType`'s comment
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