Refactor JISON grammar to reduce repetition #2421
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- UnionClause: Extract UnionOp and UnionableSelect helpers, add ParenthesizedSelect support - FromTable: Extract FromTableAlias helper to consolidate alias patterns - JoinTableAs: Reuse FromTableAlias helper - OverClause: Use optional markers for partition/order clauses - Select: Add ParenthesizedSelect support for SQL-99 compliant UNION handling Note: Insert rules kept in expanded form due to LALR parser ambiguity (column list and values list both start with LPAR)
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Note: Insert rules kept in expanded form due to LALR parser ambiguity (column list and values list both start with LPAR)
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