[CP] [CP] Fix enumset in-subquery missing wrap type to string expr

src/sql/resolver/expr/ob_raw_expr_deduce_type.cpp

@@ -95,6 +95,8 @@ int ObRawExprDeduceType::visit(ObQueryRefRawExpr& expr)
       }
     }
   } else {
+    // for enumset query ref `is_set`, need warp enum_to_str/set_to_str expr at
+    // `ObRawExprWrapEnumSet::visit_query_ref_expr`
     expr.set_data_type(ObIntType);
   }
   return ret;

src/sql/resolver/expr/ob_raw_expr_wrap_enum_set.cpp

@@ -230,6 +230,8 @@ int ObRawExprWrapEnumSet::visit(ObVarRawExpr& expr)
 int ObRawExprWrapEnumSet::visit(ObQueryRefRawExpr& expr)
 {
   UNUSED(expr);
+  // QueryRef expr for the children of `ObOpRawExpr` will be visited at `visit_query_ref_expr`.
+  // because it depends on the input_type of the parent node.
   return OB_SUCCESS;
 }
 
@@ -293,8 +295,14 @@ int ObRawExprWrapEnumSet::visit(ObOpRawExpr& expr)
           ObRawExpr* param_expr = expr.get_param_expr(i);
           ObObjType calc_type = expr.get_input_types().at(i).get_calc_type();
           ObSysFunRawExpr* new_expr = NULL;
-          if (OB_FAIL(
-                  wrap_type_to_str_if_necessary(param_expr, calc_type, get_current_level(), is_same_need, new_expr))) {
+          if (param_expr->is_query_ref_expr() && !ob_is_enumset_tc(param_expr->get_data_type())) {
+            ObQueryRefRawExpr *query_ref_expr = static_cast<ObQueryRefRawExpr *>(param_expr);
+            OZ(visit_query_ref_expr(*query_ref_expr, calc_type, is_same_need));
+          } else if (OB_FAIL(wrap_type_to_str_if_necessary(param_expr,
+                                                           calc_type,
+                                                           get_current_level(),
+                                                           is_same_need,
+                                                           new_expr))) {
             LOG_WARN("failed to wrap_type_to_str_if_necessary", K(i), K(ret));
           } else if ((NULL != new_expr) && OB_FAIL(expr.replace_param_expr(i, new_expr))) {
             LOG_WARN("replace param expr failed", K(ret));
@@ -830,5 +838,38 @@ int ObRawExprWrapEnumSet::wrap_nullif_expr(ObSysFunRawExpr& expr)
   return ret;
 }
 
+int ObRawExprWrapEnumSet::visit_query_ref_expr(
+    ObQueryRefRawExpr &expr, const ObObjType dest_type, const bool is_same_need)
+{
+  int ret = OB_SUCCESS;
+  if (!expr.has_enum_set_column()) {
+    // no-op if expr doesn't have enumset column
+  } else if (1 == expr.get_output_column() && expr.is_set() &&
+             ob_is_enumset_tc(expr.get_column_types().at(0).get_type())) {
+    ObSelectStmt *ref_stmt = expr.get_ref_stmt();
+    if (OB_ISNULL(ref_stmt)) {
+      ret = OB_ERR_UNEXPECTED;
+      LOG_WARN("ref_stmt should not be NULL", K(expr), K(ret));
+    } else if (OB_UNLIKELY(1 != ref_stmt->get_select_item_size())) {
+      ret = OB_ERR_UNEXPECTED;
+      LOG_WARN("select item size should be 1", "size", ref_stmt->get_select_item_size(), K(expr), K(ret));
+    } else if (OB_ISNULL(ref_stmt->get_select_item(0).expr_)) {
+      ret = OB_ERR_UNEXPECTED;
+      LOG_WARN("expr of select item is NULL", K(expr), K(ret));
+    } else {
+      ObRawExpr *enumset_expr = ref_stmt->get_select_item(0).expr_;
+      ObSysFunRawExpr *new_expr = NULL;
+      if (OB_FAIL(
+              wrap_type_to_str_if_necessary(enumset_expr, dest_type, get_current_level(), is_same_need, new_expr))) {
+        LOG_WARN("failed to wrap_type_to_str_if_necessary", K(ret));
+      } else if (NULL != new_expr) {
+        // replace with new wrapped expr
+        ref_stmt->get_select_item(0).expr_ = new_expr;
+      } else { /*do nothing*/
+      }
+    }
+  }
+  return ret;
+}
 }  // namespace sql
 }  // namespace oceanbase

src/sql/resolver/expr/ob_raw_expr_wrap_enum_set.h

@@ -60,6 +60,9 @@ private:
   int wrap_sub_select(ObInsertStmt& stmt);
   int wrap_value_vector(ObInsertStmt& stmt);
   int wrap_nullif_expr(ObSysFunRawExpr& expr);
+  int visit_query_ref_expr(ObQueryRefRawExpr &expr,
+                           const common::ObObjType dest_type,
+                           const bool is_same_need);
 
 private:
   int32_t current_level_;