Ramin Gharib created FLINK-39538:
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Summary: Apply conditional SET_SEMANTIC_TABLE trait to
FROM_CHANGELOG
Key: FLINK-39538
URL: https://issues.apache.org/jira/browse/FLINK-39538
Project: Flink
Issue Type: Sub-task
Components: Table SQL / Planner
Reporter: Ramin Gharib
FROM_CHANGELOG used to be locked to row semantics. With the conditional trait
API introduced for TO_CHANGELOG, the input argument now switches to set
semantics when the call provides PARTITION BY:
{code:java}
SELECT * FROM FROM_CHANGELOG(
input => TABLE cdc_stream PARTITION BY id
){code}
The planner inserts an Exchange(hash[id]) so rows with the same key are
co-located in the same parallel operator instance. Without PARTITION BY,
behavior is unchanged: each row is processed independently with row semantics.
The runtime function is unaffected — only the trait declaration and the
resulting parallel execution layout change.
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