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src/sql/engine/expr/ob_expr_timestamp_nvl.cpp

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+/**
+ * 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_timestamp_nvl.h"
+#include "share/object/ob_obj_cast.h"
+#include "sql/session/ob_sql_session_info.h"
+using namespace oceanbase::common;
+
+namespace oceanbase {
+namespace sql {
+
+ObExprTimestampNvl::ObExprTimestampNvl(ObIAllocator& alloc)
+    : ObStringExprOperator(alloc, T_FUN_SYS_TIMESTAMP_NVL, N_TIMESTAMP_NVL, 2)
+{}
+
+ObExprTimestampNvl::~ObExprTimestampNvl()
+{}
+
+int ObExprTimestampNvl::calc_result_type2(
+    ObExprResType& type, ObExprResType& type1, ObExprResType& type2, common::ObExprTypeCtx& type_ctx) const
+{
+  int ret = OB_SUCCESS;
+  UNUSED(type_ctx);
+  UNUSED(type2);
+  if (is_oracle_mode()) {
+    type.set_type(ObTimestampNanoType);
+  } else {
+    type.set_type(ObTimestampType);
+  }
+  type.set_accuracy(type1.get_accuracy());
+  type.set_collation_level(type1.get_collation_level());
+  type.set_collation_type(type1.get_collation_type());
+
+  const ObSQLSessionInfo* session = static_cast<const ObSQLSessionInfo*>(type_ctx.get_session());
+  if (OB_ISNULL(session)) {
+    ret = OB_NOT_INIT;
+    LOG_WARN("session is null", K(ret));
+  } else if (session->use_static_typing_engine()) {
+    type1.set_calc_meta(type.get_obj_meta());
+    type2.set_calc_meta(type.get_obj_meta());
+  }
+  return ret;
+}
+
+int ObExprTimestampNvl::calc_result2(ObObj& result, const ObObj& obj1, const ObObj& obj2, ObExprCtx& expr_ctx) const
+{
+  int ret = OB_SUCCESS;
+  if (obj1.is_null()) {
+    result = obj2;
+  } else {
+    result = obj1;
+  }
+
+  if (false == result.is_null()) {
+    ObObjType res_type = get_result_type().get_type();
+    EXPR_DEFINE_CAST_CTX(expr_ctx, expr_ctx.cast_mode_);
+    if (OB_FAIL(ObObjCaster::to_type(res_type, cast_ctx, result, result))) {
+      LOG_WARN("convert result to timestamp failed", K(res_type), K(result), K(ret));
+    }
+  }
+  return ret;
+}
+
+int ObExprTimestampNvl::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;
+  if (rt_expr.arg_cnt_ != 2) {
+    ret = OB_INVALID_ARGUMENT;
+    LOG_WARN("timestampnvl expr should have two params", K(ret), K(rt_expr.arg_cnt_));
+  } else if (OB_ISNULL(rt_expr.args_) || OB_ISNULL(rt_expr.args_[0]) || OB_ISNULL(rt_expr.args_[1])) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("children of timestampnvl expr is null", K(ret), K(rt_expr.args_));
+  } else {
+    rt_expr.eval_func_ = ObExprTimestampNvl::calc_timestampnvl;
+  }
+  return ret;
+}
+
+int ObExprTimestampNvl::calc_timestampnvl(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
+{
+  int ret = OB_SUCCESS;
+  ObDatum* param_datum1 = NULL;
+  ObDatum* param_datum2 = NULL;
+  bool oracle_mode = is_oracle_mode();
+  if (OB_FAIL(expr.eval_param_value(ctx, param_datum1, param_datum2))) {
+    LOG_WARN("eval param value failed", K(ret));
+  } else if (param_datum1->is_null()) {
+    if (param_datum2->is_null()) {
+      expr_datum.set_null();
+    } else if (oracle_mode) {
+      expr_datum.set_otimestamp_tiny(param_datum2->get_otimestamp_tiny());
+    } else {
+      expr_datum.set_timestamp(param_datum2->get_timestamp());
+    }
+  } else if (oracle_mode) {
+    expr_datum.set_otimestamp_tiny(param_datum1->get_otimestamp_tiny());
+  } else {
+    expr_datum.set_timestamp(param_datum1->get_timestamp());
+  }
+  return ret;
+}
+
+}  // namespace sql
+}  // namespace oceanbase