[FEAT MERGE] 4.2 add trans_debug_info for 4377

Co-authored-by: Handora <qcdsr970209@gmail.com>

src/sql/engine/basic/ob_pushdown_filter.cpp

@@ -1435,7 +1435,8 @@ ObPushdownExprSpec::ObPushdownExprSpec(ObIAllocator &alloc)
     pd_storage_filters_(alloc),
     pd_storage_aggregate_output_(alloc),
     ext_file_column_exprs_(alloc),
-    ext_column_convert_exprs_(alloc)
+    ext_column_convert_exprs_(alloc),
+    trans_info_expr_(nullptr)
 {
 }
 
@@ -1455,7 +1456,8 @@ OB_DEF_SERIALIZE(ObPushdownExprSpec)
               fake_pd_storage_index_back_filters, //mock a fake filters to compatible with 4.0
               pd_storage_aggregate_output_,
               ext_file_column_exprs_,
-              ext_column_convert_exprs_);
+              ext_column_convert_exprs_,
+              trans_info_expr_);
   return ret;
 }
 
@@ -1475,7 +1477,8 @@ OB_DEF_DESERIALIZE(ObPushdownExprSpec)
               fake_pd_storage_index_back_filters, //mock a fake filters to compatible with 4.0
               pd_storage_aggregate_output_,
               ext_file_column_exprs_,
-              ext_column_convert_exprs_);
+              ext_column_convert_exprs_,
+              trans_info_expr_);
   return ret;
 }
 
@@ -1495,7 +1498,8 @@ OB_DEF_SERIALIZE_SIZE(ObPushdownExprSpec)
               fake_pd_storage_index_back_filters, //mock a fake filters to compatible with 4.0
               pd_storage_aggregate_output_,
               ext_file_column_exprs_,
-              ext_column_convert_exprs_);
+              ext_column_convert_exprs_,
+              trans_info_expr_);
   return len;
 }
 
@@ -1525,6 +1529,49 @@ int ObPushdownOperator::init_pushdown_storage_filter()
   return ret;
 }
 
+int ObPushdownOperator::reset_trans_info_datum()
+{
+  int ret = OB_SUCCESS;
+  if (OB_NOT_NULL(expr_spec_.trans_info_expr_)) {
+    if (expr_spec_.trans_info_expr_->is_batch_result()) {
+      ObDatum *datums = expr_spec_.trans_info_expr_->locate_datums_for_update(eval_ctx_, expr_spec_.max_batch_size_);
+      for (int64_t i = 0; i < expr_spec_.max_batch_size_; i++) {
+        datums[i].set_null();
+      }
+    } else {
+      ObDatum &datum = expr_spec_.trans_info_expr_->locate_datum_for_write(eval_ctx_);
+      datum.set_null();
+    }
+  }
+  return ret;
+}
+
+int ObPushdownOperator::write_trans_info_datum(blocksstable::ObDatumRow &out_row)
+{
+  int ret = OB_SUCCESS;
+  if (OB_NOT_NULL(expr_spec_.trans_info_expr_) &&
+      OB_NOT_NULL(out_row.trans_info_)) {
+    ObDatum &datum = expr_spec_.trans_info_expr_->locate_datum_for_write(eval_ctx_);
+    char *dst_ptr = const_cast<char *>(datum.ptr_);
+    int64_t pos = 0;
+    if (OB_ISNULL(dst_ptr)) {
+      ret = OB_ERR_UNEXPECTED;
+      LOG_WARN("unexpected nullptr", K(ret));
+    } else if (OB_FAIL(databuff_memcpy(dst_ptr,
+                                       ObDASWriteBuffer::DAS_ROW_TRANS_STRING_SIZE,
+                                       pos,
+                                       strlen(out_row.trans_info_),
+                                       out_row.trans_info_))) {
+      LOG_WARN("fail to copy trans info to datum", K(ret));
+    } else {
+      datum.pack_ = pos;
+      // out_row.trans_info_ must be reset to nullptr to prevent affecting the next row
+      out_row.trans_info_ = nullptr;
+    }
+  }
+  return ret;
+}
+
 int ObPushdownOperator::clear_datum_eval_flag()
 {
   int ret = OB_SUCCESS;

src/sql/engine/basic/ob_pushdown_filter.h

@@ -40,6 +40,7 @@ struct ObTableAccessContext;
 namespace blocksstable
 {
 struct ObStorageDatum;
+struct ObDatumRow;
 };
 namespace sql
 {
@@ -532,7 +533,8 @@ public:
                K_(ext_column_convert_exprs),
                K_(max_batch_size),
                K_(pushdown_filters),
-               K_(pd_storage_flag));
+               K_(pd_storage_flag),
+               KPC_(trans_info_expr));
 
   int set_calc_exprs(const ExprFixedArray &calc_exprs, int64_t max_batch_size)
   {
@@ -554,6 +556,7 @@ public:
   // used by external table
   ExprFixedArray ext_file_column_exprs_;
   ExprFixedArray ext_column_convert_exprs_;
+  ObExpr *trans_info_expr_;
 };
 
 //下压到存储层的表达式执行依赖的op ctx
@@ -577,10 +580,13 @@ public:
   // clear eval flag of all datums within a batch
   int clear_evaluated_flag();
   int deep_copy(const sql::ObExprPtrIArray *exprs, const int64_t batch_idx);
+  int reset_trans_info_datum();
+  int write_trans_info_datum(blocksstable::ObDatumRow &out_row);
 public:
   ObPushdownFilterExecutor *pd_storage_filters_;
   ObEvalCtx &eval_ctx_;
   const ObPushdownExprSpec &expr_spec_;
+  // The datum of the trans_info expression that records transaction information
 };
 
 // filter row for storage callback.