misc refinement

src/sql/engine/expr/ob_expr_eval_functions.cpp

@@ -338,6 +338,7 @@
 #include "ob_expr_between.h"
 #include "ob_expr_align_date4cmp.h"
 #include "ob_expr_extract_cert_expired_time.h"
+#include "ob_expr_transaction_id.h"
 
 namespace oceanbase
 {
@@ -1109,7 +1110,8 @@ static ObExpr::EvalFunc g_expr_eval_functions[] = {
   NULL, // ObExprDocID::generate_doc_id,                              /* 667 */
   NULL, // ObExprWordSegment::generate_fulltext_column,               /* 668 */
   NULL, // ObExprWordCount::generate_word_count,                      /* 669 */
-  NULL, // ObExprBM25::eval_bm25_relevance_expr,                      /* 690 */
+  NULL, // ObExprBM25::eval_bm25_relevance_expr,                      /* 670 */
+  ObExprTransactionId::eval_transaction_id,                           /* 671 */
 };
 
 static ObExpr::EvalBatchFunc g_expr_eval_batch_functions[] = {

src/sql/engine/expr/ob_expr_operator_factory.cpp

@@ -404,6 +404,7 @@
 #include "sql/engine/expr/ob_expr_temp_table_ssid.h"
 #include "sql/engine/expr/ob_expr_align_date4cmp.h"
 #include "sql/engine/expr/ob_expr_extract_cert_expired_time.h"
+#include "sql/engine/expr/ob_expr_transaction_id.h"
 
 using namespace oceanbase::common;
 namespace oceanbase
@@ -1001,6 +1002,7 @@ void ObExprOperatorFactory::register_expr_operators()
     REG_OP(ObExprPrefixPattern);
     REG_OP(ObExprAlignDate4Cmp);
     REG_OP(ObExprExtractExpiredTime);
+    REG_OP(ObExprTransactionId);
   }();
 // 注册oracle系统函数
   REG_OP_ORCL(ObExprSysConnectByPath);
@@ -1312,6 +1314,7 @@ void ObExprOperatorFactory::register_expr_operators()
   REG_OP_ORCL(ObExprUpdateXml);
   REG_OP_ORCL(ObExprTempTableSSID);
   REG_OP_ORCL(ObExprJsonObjectStar);
+  REG_OP_ORCL(ObExprTransactionId);
 }
 
 bool ObExprOperatorFactory::is_expr_op_type_valid(ObExprOperatorType type)

src/sql/engine/expr/ob_expr_transaction_id.cpp

@@ -0,0 +1,91 @@
+/**
+ * Copyright (c) 2021 OceanBase
+ * OceanBase CE is licensed under Mulan PubL v2.
+ * You can use this software according to the terms and conditions of the Mulan PubL v2.
+ * You may obtain a copy of Mulan PubL v2 at:
+ *          http://license.coscl.org.cn/MulanPubL-2.0
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PubL v2 for more details.
+ */
+
+#define USING_LOG_PREFIX SQL_ENG
+#include "sql/engine/expr/ob_expr_transaction_id.h"
+#include "sql/engine/ob_exec_context.h"
+#include "sql/session/ob_sql_session_info.h"
+#include "sql/engine/ob_exec_context.h"
+
+using namespace oceanbase::common;
+namespace oceanbase
+{
+namespace sql
+{
+
+
+ObExprTransactionId::ObExprTransactionId(ObIAllocator &alloc)
+  : ObFuncExprOperator(alloc, T_FUN_SYS_TRANSACTION_ID, N_TRANSACTION_ID, 0, NOT_VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
+{
+}
+
+ObExprTransactionId::~ObExprTransactionId()
+{
+}
+
+int ObExprTransactionId::calc_result_type0(ObExprResType &type, ObExprTypeCtx &type_ctx) const
+{
+  UNUSED(type_ctx);
+  if (is_oracle_mode()) {
+    const ObAccuracy &acc = ObAccuracy::DDL_DEFAULT_ACCURACY2[common::ORACLE_MODE][common::ObNumberType];
+    type.set_number();
+    type.set_scale(acc.get_scale());
+    type.set_precision(acc.get_precision());
+  } else {
+    const ObAccuracy &acc = common::ObAccuracy::DDL_DEFAULT_ACCURACY[common::ObUInt64Type];
+    type.set_uint64();
+    type.set_scale(acc.get_scale());
+    type.set_precision(acc.get_precision());
+    type.set_result_flag(NOT_NULL_FLAG);
+  }
+  return OB_SUCCESS;
+}
+
+int ObExprTransactionId::eval_transaction_id(const ObExpr &expr, ObEvalCtx &ctx,
+    ObDatum &expr_datum)
+{
+  int ret = OB_SUCCESS;
+  UNUSED(expr);
+  const ObSQLSessionInfo *session_info = NULL;
+  if (OB_ISNULL(session_info = ctx.exec_ctx_.get_my_session())) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("session info is null", K(ret));
+  } else {
+    const transaction::ObTxDesc *txdesc = session_info->get_tx_desc();
+    const int64_t tx_id = txdesc ? txdesc->get_tx_id().get_id() : 0;
+    if (ObUInt64Type == expr.datum_meta_.type_) { // mysql mode
+      expr_datum.set_uint(tx_id);
+    } else { // oracle mode
+      ObNumStackOnceAlloc tmp_alloc;
+      number::ObNumber num;
+      if (OB_FAIL(num.from(tx_id, tmp_alloc))) {
+        LOG_WARN("copy number fail", K(ret));
+      } else {
+        expr_datum.set_number(num);
+      }
+    }
+  }
+  return ret;
+}
+
+int ObExprTransactionId::cg_expr(ObExprCGCtx &op_cg_ctx, const ObRawExpr &raw_expr,
+    ObExpr &rt_expr) const
+{
+  UNUSED(raw_expr);
+  UNUSED(op_cg_ctx);
+  rt_expr.eval_func_ = ObExprTransactionId::eval_transaction_id;
+  return OB_SUCCESS;
+}
+
+
+}/* ns sql*/
+}/* ns oceanbase */

src/sql/engine/expr/ob_expr_transaction_id.h

@@ -0,0 +1,38 @@
+/**
+ * Copyright (c) 2021 OceanBase
+ * OceanBase CE is licensed under Mulan PubL v2.
+ * You can use this software according to the terms and conditions of the Mulan PubL v2.
+ * You may obtain a copy of Mulan PubL v2 at:
+ *          http://license.coscl.org.cn/MulanPubL-2.0
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PubL v2 for more details.
+ */
+
+#ifndef OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_TRANSACTION_ID_
+#define OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_TRANSACTION_ID_
+
+#include "sql/engine/expr/ob_expr_operator.h"
+
+namespace oceanbase
+{
+namespace sql
+{
+class ObExprTransactionId : public ObFuncExprOperator
+{
+public:
+  explicit  ObExprTransactionId(common::ObIAllocator &alloc);
+  virtual ~ObExprTransactionId();
+  virtual int calc_result_type0(ObExprResType &type, common::ObExprTypeCtx &type_ctx) const;
+  static int eval_transaction_id(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum);
+  virtual int cg_expr(ObExprCGCtx &op_cg_ctx,
+                      const ObRawExpr &raw_expr,
+                      ObExpr &rt_expr) const override;
+
+private:
+  DISALLOW_COPY_AND_ASSIGN(ObExprTransactionId);
+};
+}//sql
+}//oceanbase
+#endif /* OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_TRANSACTION_ID_ */