[SPARK-56505][SQL][TESTS] SharedSparkSession provides sql.SparkSession, add SharedClassicSparkSession, ClassicQueryTest#55356

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fwc wants to merge 35 commits into

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fwc:sharedsparksession-return-abstract-sess

Commits on May 21, 2026

refactor SQLTestUtils: set active db via sql.Catalog
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refactor SQLTestUtils: use sql.Catalog to look up udf
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refactor ResolverGuardSuite: use equivalent, but sql-visible method
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refactor sql.DatasetHolder: make concrete
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Add placeholder ClassicSQLTestUtils
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Add placeholder SharedClassicSparkSession
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TODO: classic-only impl for SQLTestUtils::waitForTasksToFinish
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TODO: classic-only impl for SQLTestUtils::makeQualifiedPath
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TODO: Add non-classic uncache table path
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TODO: add cast to SharedClassicSparkSession get classic session from super
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Add AlterTableDirHelper
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use SharedClassicSparkSession, ClassicSQLTestUtils where needed
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SQLTestUtils: move classic-only helpers to ClassicSQLTestUtils
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SQLTestUtils: less classic in testImplicits
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SharedSparkSession: move classic-only helper to SharedClassicSparkSession
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SharedSparkSession: provide sql.SparkSession
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fixup

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SQLTestUtils: remove classic stuff from testImplicits

fwc
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Add and use classic.SparkSessionProvider

fwc
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Revert "SQLTestUtils: remove classic stuff from testImplicits"
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fixup classic.SparkSessionProvider: extend sql.SparkSessionProvider

fwc
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fix import ordering

fwc
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SQLTestImplicits: fix imports

fwc
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fixup: Use SharedClassicSparkSession

fwc
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remove unused 'import testImplicits'

fwc
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Add missing casts
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some more fixes
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fixup: restore upstream changes accidentally reverted by --theirs conflict resolution
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Rename ClassicSQLTestUtils to ClassicQueryTest
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Replace ClassicSQLTestUtils usage with ClassicQueryTest
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fixes from LLM review
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Fix another compile error
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Move ClassicQueryTest to test.classic.QueryTest
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Replace ClassicQueryTest usage with test.classic.QueryTest
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one more fix
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