[cross-schema] Add Java integration tests for cross-schema joins - #4446
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…ion avoidance CrossSchemaJoinTest exercises basic cross-schema table access, predicate pushdown, three-schema joins, and continuation support via RecordQueryStoreBindingPlan proto serialization. CrossSchemaTypeCollisionTest verifies that identically-named tables from different schemas do not collide in the TypeRepository when queried together.
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Summary
CrossSchemaJoinTest: covers basic inner join, WHERE predicate pushdown on the outer table, standalone secondary-schemaSELECT, three-schema join, and continuation round-trip (exercises proto serialization ofRecordQueryStoreBindingPlan)CrossSchemaTypeCollisionTest: verifies that two schemas each defining a table namedthingscan be joined and queried withoutTypeRepositorycollisionTest plan
CrossSchemaJoinTest— all test cases greenCrossSchemaTypeCollisionTest— all test cases green