init push

src/sql/engine/expr/ob_expr_fun_values.cpp

@@ -0,0 +1,88 @@
+/**
+ * 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_fun_values.h"
+#include "sql/engine/ob_physical_plan_ctx.h"
+#include "sql/engine/ob_physical_plan.h"
+#include "sql/ob_sql_utils.h"
+using namespace oceanbase::common;
+
+namespace oceanbase {
+namespace sql {
+
+ObExprFunValues::ObExprFunValues(ObIAllocator& alloc)
+    : ObFuncExprOperator(alloc, T_FUN_SYS_VALUES, N_VALUES, 1, NOT_ROW_DIMENSION)
+{}
+
+ObExprFunValues::~ObExprFunValues()
+{}
+
+int ObExprFunValues::calc_result_type1(ObExprResType& type, ObExprResType& text, common::ObExprTypeCtx& type_ctx) const
+{
+  UNUSED(type_ctx);
+  type.set_type(text.get_type());
+  type.set_collation_level(text.get_collation_level());
+  type.set_collation_type(text.get_collation_type());
+  type.set_accuracy(text.get_accuracy());
+  return OB_SUCCESS;
+}
+
+int ObExprFunValues::calc_result1(ObObj& result, const ObObj& text, ObExprCtx& expr_ctx) const
+{
+  int ret = OB_SUCCESS;
+
+  if (OB_ISNULL(expr_ctx.phy_plan_ctx_) || OB_ISNULL(expr_ctx.phy_plan_ctx_->get_phy_plan())) {
+    ret = OB_ERR_UNEXPECTED;
+    SQL_ENG_LOG(WARN, "invalid phy plan ctx", K(expr_ctx.phy_plan_ctx_));
+  } else if (OB_FAIL(ObSQLUtils::set_compatible_cast_mode((expr_ctx).my_session_, (expr_ctx).cast_mode_))) {
+    SQL_ENG_LOG(WARN, "set_compatible_cast_mode failed", K(ret));
+  } else {
+    if (ObSQLUtils::is_insert_update_scope(expr_ctx.cast_mode_)) {
+      result = text;
+    } else {
+      result.set_null();
+    }
+  }
+  return ret;
+}
+
+int ObExprFunValues::cg_expr(ObExprCGCtx&, const ObRawExpr&, ObExpr& rt_expr) const
+{
+  int ret = OB_SUCCESS;
+  CK(1 == rt_expr.arg_cnt_);
+  rt_expr.eval_func_ = &ObExprFunValues::eval_values;
+  return ret;
+}
+
+int ObExprFunValues::eval_values(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
+{
+  // values() meaningful only in insert on duplicate update clause (extra_ set to 1),
+  // return NULL otherwise.
+  int ret = OB_SUCCESS;
+  if (expr.extra_) {
+    // in insert update scope
+    ObDatum* arg = NULL;
+    if (OB_FAIL(expr.eval_param_value(ctx, arg))) {
+      LOG_WARN("evaluate parameter value failed", K(ret));
+    } else {
+      expr_datum.set_datum(*arg);
+    }
+  } else {
+    expr_datum.set_null();
+  }
+
+  return ret;
+}
+
+}  // namespace sql
+}  // namespace oceanbase