ESQL: Enable streaming LOOKUP JOIN by default#151122
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Replace the snapshot-build gate on the streaming lookup operator with a new dynamic cluster setting, esql.query.lookup_join_streaming, which defaults to true. Streaming LOOKUP JOIN now runs in release builds and can be disabled at runtime as an escape hatch. The per-node transport version check is unchanged, so mixed-version clusters still fall back to the non-streaming operator. Update tests that asserted build-flavor-dependent operator selection and add coverage for disabling the setting.
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Replace the snapshot-build gate on the streaming lookup operator with
a new dynamic cluster setting, esql.query.lookup_join_streaming, which
defaults to true. Streaming LOOKUP JOIN now runs in release builds and
can be disabled at runtime as an escape hatch. The per-node transport
version check is unchanged, so mixed-version clusters still fall back
to the non-streaming operator.
Update tests that asserted build-flavor-dependent operator selection
and add coverage for disabling the setting.
Closes #151145