use set_exprs_ instead of output_ for set op

src/sql/engine/set/ob_hash_except_op.cpp

@@ -122,9 +122,9 @@ int ObHashExceptOp::inner_get_next_row()
         cur_exprs = &left_->get_spec().output_;
       }
     } else {
-      if (OB_FAIL(hp_infras_.get_left_next_row(store_row, MY_SPEC.output_))) {
+      if (OB_FAIL(hp_infras_.get_left_next_row(store_row, MY_SPEC.set_exprs_))) {
       } else {
-        cur_exprs = &MY_SPEC.output_;
+        cur_exprs = &MY_SPEC.set_exprs_;
       }
     }
     if (OB_ITER_END == ret) {
@@ -176,7 +176,7 @@ int ObHashExceptOp::inner_get_next_row()
     }
   }  // end of while
   if (OB_SUCC(ret) && !has_got_part_) {
-    if (OB_FAIL(convert_row(*cur_exprs, MY_SPEC.output_))) {
+    if (OB_FAIL(convert_row(*cur_exprs, MY_SPEC.set_exprs_))) {
       LOG_WARN("copy current row failed", K(ret));
     }
   }

src/sql/engine/set/ob_hash_intersect_op.cpp

@@ -109,9 +109,9 @@ int ObHashIntersectOp::inner_get_next_row()
         cur_exprs = &left_->get_spec().output_;
       }
     } else {
-      if (OB_FAIL(hp_infras_.get_left_next_row(store_row, MY_SPEC.output_))) {
+      if (OB_FAIL(hp_infras_.get_left_next_row(store_row, MY_SPEC.set_exprs_))) {
       } else {
-        cur_exprs = &MY_SPEC.output_;
+        cur_exprs = &MY_SPEC.set_exprs_;
       }
     }
     if (OB_ITER_END == ret) {
@@ -162,7 +162,7 @@ int ObHashIntersectOp::inner_get_next_row()
     }
   }  // end of while
   if (OB_SUCC(ret) && !has_got_part_) {
-    if (OB_FAIL(convert_row(*cur_exprs, MY_SPEC.output_))) {
+    if (OB_FAIL(convert_row(*cur_exprs, MY_SPEC.set_exprs_))) {
       LOG_WARN("copy current row failed", K(ret));
     }
   }

src/sql/engine/set/ob_hash_set_op.cpp

@@ -143,8 +143,10 @@ int ObHashSetOp::build_hash_table(bool from_child)
         LOG_WARN("failed to insert row", K(ret));
       }
     } else {
-      if (OB_FAIL(hp_infras_.get_right_next_row(store_row, get_spec().output_))) {
-      } else if (OB_FAIL(hp_infras_.insert_row(get_spec().output_, has_exists, inserted))) {
+      if (OB_FAIL(
+              hp_infras_.get_right_next_row(store_row, static_cast<const ObHashSetSpec &>(get_spec()).set_exprs_))) {
+      } else if (OB_FAIL(hp_infras_.insert_row(
+                     static_cast<const ObHashSetSpec &>(get_spec()).set_exprs_, has_exists, inserted))) {
         LOG_WARN("failed to insert row", K(ret));
       }
     }

src/sql/engine/set/ob_merge_except_op.cpp

@@ -118,7 +118,7 @@ int ObMergeExceptOp::inner_get_next_row()
     }
   }
   if (OB_SUCC(ret)) {
-    if (OB_FAIL(convert_row(*left_row, MY_SPEC.output_))) {
+    if (OB_FAIL(convert_row(*left_row, MY_SPEC.set_exprs_))) {
       LOG_WARN("failed to convert row", K(ret));
     } else if (OB_FAIL(last_row_.save_store_row(*left_row, eval_ctx_, 0))) {
       LOG_WARN("failed to save right row", K(ret));

src/sql/engine/set/ob_merge_intersect_op.cpp

@@ -109,7 +109,7 @@ int ObMergeIntersectOp::inner_get_next_row()
     }
   }
   if (OB_SUCC(ret)) {
-    if (OB_FAIL(convert_row(*left_row, MY_SPEC.output_))) {
+    if (OB_FAIL(convert_row(*left_row, MY_SPEC.set_exprs_))) {
       LOG_WARN("failed to convert row", K(ret));
     } else if (OB_FAIL(last_row_.save_store_row(*left_row, eval_ctx_, 0))) {
       LOG_WARN("failed to save right row", K(ret));