[FEAT MERGE] Solidify session vars for functional index

src/sql/engine/expr/ob_expr_insert.cpp

@@ -266,6 +266,13 @@ int ObExprInsert::calc_expr_insert(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &
   return ret;
 }
 
+DEF_SET_LOCAL_SESSION_VARS(ObExprInsert, raw_expr) {
+  int ret = OB_SUCCESS;
+  SET_LOCAL_SYSVAR_CAPACITY(1);
+  EXPR_ADD_LOCAL_SYSVAR(share::SYS_VAR_COLLATION_CONNECTION);
+  return ret;
+}
+
 }
 }