branch-4.0: [fix](query-cache) include variant subcolumn path in query cache digest #61709#61718
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…st (#61709) Different variant subcolumn queries (e.g. data['int_1'] vs data['int_nested']) were generating the same cache digest because normalizeSelectColumns() only used the base column name. This caused query cache to return wrong results when different subcolumns of the same variant column were queried. Fix: include the variant subcolumn path in the normalized select column name so that different subcolumns produce different cache digests.
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Cherry-picked from #61709