branch4.0: [feature](variable) enables views, materialized views, generated columns, and alias functions to persist session variables #58031 #58821
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…mns, and alias functions to persist session variables (apache#58031) Problem Summary: When creating views, generated columns, materialized views, or alias functions, session variables that affect query results (e.g., `enable_decimal256`) are not persisted. This causes inconsistent query results when session variables differ between creation and query time. This PR persists session variables marked with `affectQueryResult()` annotation for: - Views - Generated Columns - Materialized Views - Alias Functions When querying these objects, the system automatically uses the persisted session variables from creation time, ensuring consistent results. - Added `sessionVariables` field to `View`, `Column`, `MTMV`, and `AliasFunction` classes - Created `AutoCloseSessionVariable` utility to temporarily apply persisted variables during query processing - Modified view/column/MV/function parsing logic to use persisted session variables - Added `SessionVarGuardExpr` to protect expressions that depend on session variables --------- Co-authored-by: jacktengg <tengjianping@selectdb.com>
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picked from #58031