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src/sql/engine/expr/ob_expr_from_unix_time.h

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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.
+ */
+
+#ifndef ENGINE_EXPR_OB_EXPR_FROM_UNIX_TIME_H_
+#define ENGINE_EXPR_OB_EXPR_FROM_UNIX_TIME_H_
+
+#include "lib/ob_name_def.h"
+#include "share/object/ob_obj_cast.h"
+#include "sql/engine/expr/ob_expr_operator.h"
+
+namespace oceanbase {
+namespace sql {
+class ObExprFromUnixTime : public ObFuncExprOperator {
+  public:
+  explicit ObExprFromUnixTime(common::ObIAllocator& alloc);
+  virtual ~ObExprFromUnixTime();
+  virtual int calc_result_typeN(
+      ObExprResType& type, ObExprResType* params, int64_t params_count, common::ObExprTypeCtx& type_ctx) const;
+  virtual int calc_resultN(
+      common::ObObj& result, const common::ObObj* params, int64_t params_count, common::ObExprCtx& expr_ctx) const;
+
+  virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
+
+  static int eval_one_temporal_fromtime(const ObExpr& expr, ObEvalCtx& eval_ctx, ObDatum& expr_datum);
+
+  static int eval_one_param_fromtime(const ObExpr& expr, ObEvalCtx& eval_ctx, ObDatum& expr_datum);
+
+  static int eval_fromtime_normal(const ObExpr& expr, ObEvalCtx& eval_ctx, ObDatum& expr_datum);
+
+  static int eval_fromtime_special(const ObExpr& expr, ObEvalCtx& eval_ctx, ObDatum& expr_datum);
+
+  private:
+  static int calc(
+      common::ObObj& result, const common::ObObj& param, const common::ObObj& format, common::ObExprCtx& expr_ctx);
+  static int get_usec(const common::ObObj& param, common::ObExprCtx& expr_ctx, int64_t& value);
+  int set_scale_for_single_param(ObExprResType& type, const ObExprResType& type1) const;
+
+  common::ObObjType calc_one_param_type(ObExprResType* params) const;
+
+  static int get_usec_from_datum(const common::ObDatum& param_datum, common::ObIAllocator& alloc, int64_t& value);
+
+  // static int eval_two_
+  // disallow copy
+  DISALLOW_COPY_AND_ASSIGN(ObExprFromUnixTime);
+};
+
+}  // namespace sql
+}  // namespace oceanbase
+
+#endif /* ENGINE_EXPR_OB_EXPR_FROM_UNIX_TIME_H_ */