[cross-schema] Add YAML integration tests and documentation for cross-schema joins - #4447
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cross-schema-join.yamsql tests basic joins, WHERE pushdown, standalone secondary-schema queries, three-schema joins, and same-named table type-collision avoidance across five schemas in a single database. YamlIntegrationTests wires in the new yamsql file. Joins.rst documents the schema_name.table_name qualifier syntax, the same-database constraint, and multi-schema join examples.
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table-as-column-tests.yamsql was deleted upstream in ca9cdd6 ("Address Hazem's review comments on PR #4195"), which consolidated its tests into select-a-star.yamsql. This branch had picked up the now-stale registration via an old merge-forward sync with main, and my conflict resolution kept it without noticing the backing file no longer exists.
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Summary
cross-schema-join.yamsql: end-to-end YAML tests covering basic inner join (withSTORE_BINDexplain check), WHERE pushdown, standalone secondary-schema query, three-schema join, and same-named-table type-collision avoidance across five schemas in one database; gated on!current_versionYamlIntegrationTests: wires in the new yamsql filedocs/sphinx/source/reference/Joins.rst: documents theschema_name.table_namequalifier syntax, same-database constraint, standalone secondary queries, and multi-schema join examplesTest plan
YamlIntegrationTests#crossSchemaJoinTests— all 7 test cases green