MDEV-10426 ANY_VALUE function#5151

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jaeheonshim:MDEV-10426-any-value

Commits on Jul 1, 2026

Create Item_func_any_value and Create_func_any_value
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Track ANY_VALUE nesting context in fix_fields
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Allow in_any_value to bypass set_non_agg_field_used in fix_fields
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Modify Item_field::fix_fields and Item_field::fix_outer_field to push to non_agg_fields only if BOTH in_sum_func and in_any_value are false
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Modify existing group_by test to allow referencing outer field in correlated subquery as long as it is aggregated
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Add additional test cases to any_value
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Undo COALESCE implementation of ANY_VALUE
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Implement ANY_VALUE as a 'real' aggregate function through subclassing Item_sum_min_max
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Add additional test cases to verify edge cases
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Fix a minor indexing error in sql_yacc.yy, add ANY_VALUE_FUNC to is_aggr_sum_func()
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Modify any_value test case to include null rows and empty table
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Implement copy_or_same
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Add charset/collation/coercibility tests
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Recalculate digst hashes in perfschema tests
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Add additional any_value tests
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Add prefix and suffix to any_value.test
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