[BUGFIX]fix process lob default val

src/sql/code_generator/ob_static_engine_expr_cg.cpp

@@ -18,6 +18,7 @@
 #include "sql/code_generator/ob_column_index_provider.h"
 #include "sql/engine/expr/ob_expr_util.h"
 #include "sql/engine/expr/ob_expr_extra_info_factory.h"
+#include "sql/engine/expr/ob_expr_lob_utils.h"
 
 namespace oceanbase
 {
@@ -1065,7 +1066,11 @@ int ObStaticEngineExprCG::alloc_const_frame(const ObIArray<ObRawExpr *> &exprs,
         if (0 == datum->len_) {
           datum->ptr_ = NULL;
         } else {
-          OB_ASSERT(rt_expr->obj_meta_.has_lob_header() == tmp_obj.has_lob_header());
+          if (is_lob_storage(tmp_obj.get_type())) {
+            if (OB_FAIL(ob_adjust_lob_datum(tmp_obj, rt_expr->obj_meta_, allocator_, datum))) {
+              LOG_WARN("fail to adjust lob datum", K(ret), K(tmp_obj), K(rt_expr->obj_meta_), K(datum));
+            }
+          }
         }
       }
     }

src/sql/engine/basic/ob_pushdown_filter.cpp

@@ -826,6 +826,16 @@ int ObPushdownFilterExecutor::init_filter_param(
           } else if (!def_cell.is_nop_value()) {
             if (OB_FAIL(default_datum.from_obj(def_cell))) {
               LOG_WARN("convert obj to datum failed", K(ret), K(col_params_.count()), K(def_cell));
+            } else {
+              // def value must have no lob header
+              // When do lob pushdown, should add lob header for default value
+              ObString data = default_datum.get_string();
+              ObString out;
+              if (OB_FAIL(ObLobManager::fill_lob_header(allocator_, data, out))) {
+                LOG_WARN("failed to fill lob header for column.", K(idx), K(def_cell), K(data));
+              } else {
+                default_datum.set_string(out);
+              }
             }
           }
           if (OB_FAIL(ret)) {

src/sql/engine/expr/ob_expr_lob_utils.cpp

@@ -155,6 +155,14 @@ int ob_adjust_lob_datum(const ObObj &origin_obj,
                         const common::ObObjMeta &obj_meta,
                         ObIAllocator &allocator,
                         ObDatum &out_datum)
+{
+  return ob_adjust_lob_datum(origin_obj, obj_meta, allocator, &out_datum);
+}
+
+int ob_adjust_lob_datum(const ObObj &origin_obj,
+                        const common::ObObjMeta &obj_meta,
+                        ObIAllocator &allocator,
+                        ObDatum *out_datum)
 {
   int ret = OB_SUCCESS;
   if (!is_lob_storage(origin_obj.get_type())) { // null & nop is not lob
@@ -167,14 +175,14 @@ int ob_adjust_lob_datum(const ObObj &origin_obj,
       if (OB_FAIL(ObTextStringHelper::read_real_string_data(&allocator, origin_obj, full_data))) {
         LOG_WARN("Lob: failed to get full data", K(ret));
       } else {
-        out_datum.set_string(full_data);
+        out_datum->set_string(full_data);
       }
     } else { // origin obj does not have lob header, but meta has, build temp lob header
-      // OB_ASSERT(0); // should not come here?
+      // use by not strict default value add lob header
       ObObj out_obj(origin_obj);
       if (OB_FAIL(ObTextStringResult::ob_convert_obj_temporay_lob(out_obj, allocator))) {
         LOG_WARN("Lob: failed to convert plain lob data to temp lob", K(ret));
-      } else if (OB_FAIL(out_datum.from_obj(out_obj))) {
+      } else if (OB_FAIL(out_datum->from_obj(out_obj))) {
         LOG_WARN("convert lob obj to datum failed", K(ret), K(out_obj));
       }
     }

src/sql/engine/expr/ob_expr_lob_utils.h

@@ -241,6 +241,11 @@ int ob_adjust_lob_datum(const ObObj &origin_obj,
                         ObIAllocator &allocator,
                         ObDatum &out_datum);
 
+int ob_adjust_lob_datum(const ObObj &origin_obj,
+                        const common::ObObjMeta &obj_meta,
+                        ObIAllocator &allocator,
+                        ObDatum *out_datum);
+
 int ob_adjust_lob_datum(ObDatum &datum,
                         const common::ObObjMeta &in_obj_meta,
                         const common::ObObjMeta &out_obj_meta,