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

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fwc wants to merge 39 commits into

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fwc:sharedsparksession-return-abstract-sess

Commits on May 24, 2026

refactor QueryTest: set active db via sql.Catalog
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refactor QueryTest: 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 classic.SparkSessionProvider
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Add classic.QueryTest
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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, classic.QueryTest where needed
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QueryTest: Move classic-only helpers to classic.QueryTest
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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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Add and use classic.SparkSessionProvider

fwc
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fixup classic.SparkSessionProvider: extend sql.SparkSessionProvider

fwc
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fix import ordering

fwc
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fixup: Use SharedClassicSparkSession

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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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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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Replace ClassicQueryTest usage with test.classic.QueryTest
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one more fix
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Move SharedClassicSparkSession to classic.SharedSparkSession
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fix SharedClassicSparkSession import
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another fix
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fixup: classic.SharedSparkSession
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some more fixes
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more fixes
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Commits on May 25, 2026

Add UnsupportedOperationException landmines for Connect
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Document testImplicits as classic-only and add UnsupportedOperationException
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Add Connect demonstrator: SharedSparkSession, SparkSessionProvider, QueryTest
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Commits on May 27, 2026

Improve Connect demonstrator: extend QueryTestSuite directly
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