init push

src/sql/engine/expr/ob_expr_remove_const.cpp

@@ -0,0 +1,60 @@
+/**
+ * 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 "ob_expr_remove_const.h"
+
+namespace oceanbase {
+using namespace common;
+namespace sql {
+
+ObExprRemoveConst::ObExprRemoveConst(ObIAllocator& alloc)
+    : ObFuncExprOperator(alloc, T_FUN_SYS_REMOVE_CONST, N_REMOVE_CONST, 1, NOT_ROW_DIMENSION)
+{}
+
+int ObExprRemoveConst::calc_result_type1(ObExprResType& type, ObExprResType& arg, common::ObExprTypeCtx&) const
+{
+  int ret = OB_SUCCESS;
+  type = arg;
+  return ret;
+}
+
+int ObExprRemoveConst::calc_result1(common::ObObj& result, const common::ObObj& arg, common::ObExprCtx&) const
+{
+  int ret = OB_SUCCESS;
+  result = arg;
+  return ret;
+}
+
+int ObExprRemoveConst::cg_expr(ObExprCGCtx&, const ObRawExpr&, ObExpr& rt_expr) const
+{
+  int ret = OB_SUCCESS;
+  CK(1 == rt_expr.arg_cnt_);
+  rt_expr.eval_func_ = &ObExprRemoveConst::eval_remove_const;
+  return ret;
+}
+
+int ObExprRemoveConst::eval_remove_const(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
+{
+  int ret = OB_SUCCESS;
+  ObDatum* arg = NULL;
+  if (OB_FAIL(expr.eval_param_value(ctx, arg))) {
+    LOG_WARN("expr evaluate parameter failed", K(ret));
+  } else {
+    expr_datum.set_datum(*arg);
+  }
+  return ret;
+}
+
+}  // namespace sql
+}  // namespace oceanbase