[jira] [Created] (FLINK-40111) Keyless upsert sink should fall back to retract when the input has no upsert key

["Gustavo de Morais (Jira)" <ji...@apache.org>]

Gustavo de Morais created FLINK-40111:
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             Summary: Keyless upsert sink should fall back to retract when the input has no upsert key
                 Key: FLINK-40111
                 URL: https://issues.apache.org/jira/browse/FLINK-40111
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / API
            Reporter: Gustavo de Morais
            Assignee: Gustavo de Morais


When a sink without a primary key advertises an upsert changelog (ONLY_UPDATE_AFTER), {{FlinkChangelogModeInferenceProgram}} currently always lets the planner keep UPDATE_AFTER-only, regardless of the input. A keyless sink has no key for the downstream to apply updates by, so an unkeyed upsert stream cannot be materialized correctly.

Make {{inferSinkRequiredTraits}} fall back to BEFORE_AND_AFTER (retract) for a keyless sink when the input produces no upsert key. When the input can produce UPDATE_BEFORE (e.g. via ChangelogNormalize), the query then plans as retract instead of failing; when it cannot, planning fails as before. Keyed-sink behavior is unchanged.



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