xuyang created FLINK-34335:
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Summary: Query hints in RexSubQuery could not be printed
Key: FLINK-34335
URL: https://issues.apache.org/jira/browse/FLINK-34335
Project: Flink
Issue Type: Bug
Components: Table SQL / Planner
Reporter: xuyang
Fix For: 1.19.0
That is because in `RelTreeWriterImpl`, we don't care about the `RexSubQuery`.
And `RexSubQuery` use `RelOptUtil.toString(rel)` to print itself instead of
adding extra information such as query hints.
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