venkata91 commented on code in PR #23313:
URL: https://github.com/apache/flink/pull/23313#discussion_r1324893510
##########
flink-table/flink-table-planner/src/main/scala/org/apache/flink/table/planner/plan/utils/RexNodeExtractor.scala:
##########
@@ -538,8 +550,34 @@ class RexNodeToExpressionConverter(
}
}
- override def visitFieldAccess(fieldAccess: RexFieldAccess):
Option[ResolvedExpression] = None
+ override def visitFieldAccess(fieldAccess: RexFieldAccess):
Option[ResolvedExpression] = {
+ fieldAccess.getReferenceExpr match {
+ // push down on nested field inside a composite type like map or array
is not supported
+ case _: RexCall => return None
Review Comment:
Do you mean make it clear in the comment that `lower(a.b.c) = "foo"` is not
supported? The above addresses cases like:
```
"SELECT * FROM NestedItemTable WHERE `Result`.`Mid`.data_arr[2].`value` = 3"
```
where `data_arr` is an Array and `data_arr[2]` is expressed as
`RexCall(ITEM, data_arr, 2)` which won't be supported.
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