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`EXPLAIN ... WITH (schema)` prints the schema of each dataflow export, for materialized views and subscribes, as column definitions: names, types, nullability, and the unique keys known for the export. Keys over nullable columns print as `UNIQUE NULLS NOT DISTINCT`, which matches how `RelationDesc` keys treat NULL. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
antiguru
added this pull request to stack #39622
October 7, 2026 07:04
antiguru
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EXPLAIN ... WITH (schema)prints the schema of each dataflow export, for materialized views and subscribes, as column definitions: names, types, nullability, and the unique keys known for the export. Keys over nullable columns print asUNIQUE NULLS NOT DISTINCT, which matches howRelationDesckeys treat NULL.The option is not feature-gated, since it is also useful for inspecting inferred schemas. It is the way to see what to write when declaring a schema with the declared schemas later in this stack. Design: #39596.
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