Ramin Gharib created FLINK-39801:
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Summary: 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
`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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