[CP] enhance GTT

src/sql/engine/expr/ob_expr_eval_functions.cpp

@@ -332,6 +332,7 @@
 #include "ob_expr_uniform.h"
 #include "ob_expr_prefix_pattern.h"
 #include "ob_expr_initcap.h"
+#include "ob_expr_temp_table_ssid.h"
 
 namespace oceanbase
 {
@@ -1033,8 +1034,8 @@ static ObExpr::EvalFunc g_expr_eval_functions[] = {
   ObExprUpdateXml::eval_update_xml,                                   /* 603 */
   ObExprJoinFilter::eval_range_filter,                                /* 604 */
   ObExprJoinFilter::eval_in_filter,                                   /* 605 */
-  ObExprCurrentScn::eval_current_scn                                  /* 606 */
-  //ObExprTempTableSSID::calc_temp_table_ssid,                          /* 607 */
+  ObExprCurrentScn::eval_current_scn,                                 /* 606 */
+  ObExprTempTableSSID::calc_temp_table_ssid,                          /* 607 */
 };
 
 static ObExpr::EvalBatchFunc g_expr_eval_batch_functions[] = {

src/sql/engine/expr/ob_expr_operator_factory.cpp

@@ -401,6 +401,7 @@
 #include "sql/engine/expr/ob_expr_xml_serialize.h"
 #include "sql/engine/expr/ob_expr_xmlcast.h"
 #include "sql/engine/expr/ob_expr_update_xml.h"
+#include "sql/engine/expr/ob_expr_temp_table_ssid.h"
 
 using namespace oceanbase::common;
 namespace oceanbase
@@ -1305,6 +1306,7 @@ void ObExprOperatorFactory::register_expr_operators()
   REG_OP_ORCL(ObExprXmlSerialize);
   REG_OP_ORCL(ObExprXmlcast);
   REG_OP_ORCL(ObExprUpdateXml);
+  REG_OP_ORCL(ObExprTempTableSSID);
 }
 
 bool ObExprOperatorFactory::is_expr_op_type_valid(ObExprOperatorType type)

src/sql/engine/expr/ob_expr_temp_table_ssid.cpp

@@ -0,0 +1,92 @@
+/**
+ * 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.
+ */
+
+// (C) Copyright 2011-2023 Alibaba Inc. All Rights Reserved.
+//  Authors:
+//    jim.wjh <>
+//
+#define USING_LOG_PREFIX SQL_ENG
+#include "ob_expr_temp_table_ssid.h"
+#include "sql/session/ob_sql_session_info.h"
+#include "sql/engine/ob_exec_context.h"
+
+using namespace oceanbase::common;
+using namespace oceanbase::sql;
+
+namespace oceanbase
+{
+namespace sql
+{
+
+ObExprTempTableSSID::ObExprTempTableSSID(ObIAllocator &alloc)
+    : ObFuncExprOperator(alloc, T_FUN_GET_TEMP_TABLE_SESSID, N_TEMP_TABLE_SSID, 1, NOT_VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
+{
+}
+
+ObExprTempTableSSID::~ObExprTempTableSSID()
+{
+}
+
+int ObExprTempTableSSID::calc_result_type1(ObExprResType &type, ObExprResType &type1, ObExprTypeCtx &type_ctx) const
+{
+  UNUSED(type1);
+  UNUSED(type_ctx);
+  int ret = OB_SUCCESS;
+  type.set_int();
+  type.set_precision(ObAccuracy::DDL_DEFAULT_ACCURACY[ObIntType].precision_);
+  type.set_scale(DEFAULT_SCALE_FOR_INTEGER);
+  type1.set_calc_type(ObIntType);
+  return ret;
+}
+
+int ObExprTempTableSSID::calc_temp_table_ssid(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res)
+{
+  int ret = OB_SUCCESS;
+  ObDatum *param = NULL;
+  if (OB_ISNULL(ctx.exec_ctx_.get_my_session())) {
+    ret = OB_ERR_UNDEFINED;
+  } else if (OB_FAIL(expr.args_[0]->eval(ctx, param))) {
+    LOG_WARN("fail to eval param", K(ret));
+  } else if (expr.args_[0]->datum_meta_.type_ != ObIntType) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("invalid object", K(ret));
+  } else {
+    switch (param->get_int()) {
+      case GTT_SESSION_SCOPE:
+        res.set_int(ctx.exec_ctx_.get_my_session()->get_gtt_session_scope_unique_id());
+        break;
+      case GTT_TRANS_SCOPE:
+        res.set_int(ctx.exec_ctx_.get_my_session()->get_gtt_trans_scope_unique_id());
+        break;
+      default:
+        ret = OB_ERR_UNEXPECTED;
+        LOG_WARN("invalid object", K(ret), KPC(param));
+    }
+    LOG_DEBUG("get result", K(res.get_int()));
+  }
+  return ret;
+}
+
+int ObExprTempTableSSID::cg_expr(
+    ObExprCGCtx &op_cg_ctx,
+    const ObRawExpr &raw_expr,
+    ObExpr &rt_expr) const
+{
+  UNUSED(op_cg_ctx);
+  UNUSED(raw_expr);
+  int ret = OB_SUCCESS;
+  rt_expr.eval_func_ = calc_temp_table_ssid;
+  return ret;
+}
+
+}
+}

src/sql/engine/expr/ob_expr_temp_table_ssid.h

@@ -0,0 +1,45 @@
+/**
+ * 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.
+ */
+
+// Copyright (c) 2011-2023 Alibaba Inc. All Rights Reserved.
+// Author:
+//    jim.wjh <>
+
+
+#ifndef _OB_EXPR_TEMP_TABLE_SSID_H
+#define _OB_EXPR_TEMP_TABLE_SSID_H
+#include "sql/engine/expr/ob_expr_operator.h"
+
+namespace oceanbase
+{
+namespace sql
+{
+
+class ObExprTempTableSSID : public ObFuncExprOperator
+{
+public:
+  enum {GTT_SESSION_SCOPE, GTT_TRANS_SCOPE, MAX_GTT_SCOPTE};
+public:
+  explicit  ObExprTempTableSSID(common::ObIAllocator &alloc);
+  virtual ~ObExprTempTableSSID();
+  int calc_result_type1(ObExprResType &type, ObExprResType &type1, common::ObExprTypeCtx &type_ctx) const override;
+  int cg_expr(ObExprCGCtx &op_cg_ctx, const ObRawExpr &raw_expr, ObExpr &rt_expr) const override;
+  static int calc_temp_table_ssid(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res);
+
+private:
+  DISALLOW_COPY_AND_ASSIGN(ObExprTempTableSSID);
+};
+
+}
+}
+
+#endif // _OB_EXPR_TEMP_TABLE_SSID_H