[WIP][SPARK-54652] Complete conversion of IDENTIFIER()#53407

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aleksandr-chernousov-db wants to merge 6 commits intoapache:masterfrom

aleksandr-chernousov-db:SPARK-54652

Commits on Dec 9, 2025

Fix usage of identifiers
Ubuntu
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add tests
Ubuntu
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Update tests
Ubuntu
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Commits on Dec 10, 2025

Commits on Dec 11, 2025

tests for keywords
aleksandr-chernousov-db
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