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https://issues.apache.org/jira/browse/FLINK-39801?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sergey Nuyanzin resolved FLINK-39801.
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Fix Version/s: 2.4.0
Resolution: Fixed
> Skip serializing empty partitionKeys / orderKeys / orderDirections in
> TABLE_ARG_CALL compiled plan
> --------------------------------------------------------------------------------------------------
>
> Key: FLINK-39801
> URL: https://issues.apache.org/jira/browse/FLINK-39801
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Planner
> Reporter: Ramin Gharib
> Assignee: Ramin Gharib
> Priority: Minor
> Labels: pull-request-available
> Fix For: 2.4.0
>
>
> RexNodeJsonSerializer.serializeTableArgCall always writes partitionKeys,
> orderKeys, and orderDirections, even when empty. This bloats compiled plans
> with [ ] entries for the common case where a table argument has no ORDER BY
> (and often no PARTITION BY).
> Skip writing each array when empty, matching the existing pattern in
> serializeCall for operands.
> The deserializer must tolerate the absent fields. orderDirections already
> does; partitionKeys and orderKeys currently use JsonNode.required(...) and
> need to default to an empty array when missing.
> Existing restore-tests plan JSON files that contain the empty arrays need
> regenerating.
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