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src/sql/engine/expr/ob_expr_date.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 "ob_expr_date.h"
+#include "lib/timezone/ob_time_convert.h"
+
+using namespace oceanbase::common;
+using namespace oceanbase::sql;
+
+namespace oceanbase {
+namespace sql {
+
+ObExprDate::ObExprDate(ObIAllocator& alloc) : ObFuncExprOperator(alloc, T_FUN_SYS_DATE, N_DATE, 1, NOT_ROW_DIMENSION)
+{}
+
+ObExprDate::~ObExprDate()
+{}
+
+int ObExprDate::calc_result1(ObObj& result, const ObObj& date, ObExprCtx& expr_ctx) const
+{
+  int ret = OB_SUCCESS;
+  if (date.is_null()) {
+    result.set_null();
+  } else {
+    TYPE_CHECK(date, ObDateType);
+    result.set_date(date.get_date());
+  }
+  UNUSED(expr_ctx);
+  return ret;
+}
+
+int ObExprDate::cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
+{
+  int ret = OB_SUCCESS;
+  UNUSED(op_cg_ctx);
+  UNUSED(raw_expr);
+  rt_expr.eval_func_ = ObExprDate::eval_date;
+
+  return ret;
+}
+
+int ObExprDate::eval_date(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum)
+{
+  int ret = OB_SUCCESS;
+  ObDatum* param = NULL;
+  if (OB_FAIL(expr.args_[0]->eval(ctx, param))) {
+    LOG_WARN("fail to eval conv", K(ret), K(expr));
+  } else if (param->is_null()) {
+    res_datum.set_null();
+  } else {
+    res_datum.set_date(param->get_date());
+  }
+
+  return ret;
+}
+
+}  // namespace sql
+}  // namespace oceanbase