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src/sql/engine/expr/ob_expr_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 SRC_SQL_ENGINE_EXPR_OB_EXPR_TIME_H_
+#define SRC_SQL_ENGINE_EXPR_OB_EXPR_TIME_H_
+
+#include "sql/engine/expr/ob_expr_operator.h"
+
+namespace oceanbase {
+namespace sql {
+class ObExprTime : public ObFuncExprOperator {
+  public:
+  explicit ObExprTime(common::ObIAllocator& alloc);
+  virtual ~ObExprTime();
+  virtual int calc_result_type1(ObExprResType& type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const;
+  virtual int calc_result1(common::ObObj& result, const common::ObObj& time, common::ObExprCtx& expr_ctx) const;
+  virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
+  static int calc_time(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
+
+  private:
+  // disallow copy
+  DISALLOW_COPY_AND_ASSIGN(ObExprTime);
+};
+
+class ObExprTimeBase : public ObFuncExprOperator {
+  public:
+  explicit ObExprTimeBase(common::ObIAllocator& alloc, int32_t date_type, ObExprOperatorType type, const char* name);
+  virtual ~ObExprTimeBase();
+  virtual int calc_result_type1(ObExprResType& type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const;
+  virtual int calc_result1(common::ObObj& result, const common::ObObj& time, common::ObExprCtx& expr_ctx) const;
+  virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
+  static int calc(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum, int32_t type, bool with_date,
+      bool is_dayofmonth = false);
+
+  private:
+  int32_t dt_type_;
+  // disallow copy
+  DISALLOW_COPY_AND_ASSIGN(ObExprTimeBase);
+};
+inline int ObExprTimeBase::calc_result_type1(
+    ObExprResType& type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const
+{
+  UNUSED(type_ctx);
+  UNUSED(type1);
+  type.set_int32();
+  type.set_precision(4);
+  type.set_scale(0);
+  common::ObObjTypeClass tc1 = ob_obj_type_class(type1.get_type());
+  if (ob_is_enumset_tc(type1.get_type())) {
+    type1.set_calc_type(common::ObVarcharType);
+  } else if ((common::ObFloatTC == tc1) || (common::ObDoubleTC == tc1)) {
+    type1.set_calc_type(common::ObIntType);
+  }
+  return common::OB_SUCCESS;
+}
+
+class ObExprHour : public ObExprTimeBase {
+  public:
+  explicit ObExprHour(common::ObIAllocator& alloc);
+  virtual ~ObExprHour();
+  static int calc_hour(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
+
+  private:
+  // disallow copy
+  DISALLOW_COPY_AND_ASSIGN(ObExprHour);
+};
+
+class ObExprMinute : public ObExprTimeBase {
+  public:
+  ObExprMinute();
+  explicit ObExprMinute(common::ObIAllocator& alloc);
+  virtual ~ObExprMinute();
+  static int calc_minute(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
+
+  private:
+  DISALLOW_COPY_AND_ASSIGN(ObExprMinute);
+};
+
+class ObExprSecond : public ObExprTimeBase {
+  public:
+  ObExprSecond();
+  explicit ObExprSecond(common::ObIAllocator& alloc);
+  virtual ~ObExprSecond();
+  static int calc_second(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
+
+  private:
+  DISALLOW_COPY_AND_ASSIGN(ObExprSecond);
+};
+
+class ObExprMicrosecond : public ObExprTimeBase {
+  public:
+  ObExprMicrosecond();
+  explicit ObExprMicrosecond(common::ObIAllocator& alloc);
+  virtual ~ObExprMicrosecond();
+  static int calc_microsecond(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
+
+  private:
+  DISALLOW_COPY_AND_ASSIGN(ObExprMicrosecond);
+};
+
+class ObExprYear : public ObExprTimeBase {
+  public:
+  ObExprYear();
+  explicit ObExprYear(common::ObIAllocator& alloc);
+  virtual ~ObExprYear();
+  static int calc_year(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
+
+  private:
+  DISALLOW_COPY_AND_ASSIGN(ObExprYear);
+};
+
+class ObExprMonth : public ObExprTimeBase {
+  public:
+  ObExprMonth();
+  explicit ObExprMonth(common::ObIAllocator& alloc);
+  virtual ~ObExprMonth();
+  static int calc_month(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
+
+  private:
+  DISALLOW_COPY_AND_ASSIGN(ObExprMonth);
+};
+
+class ObExprMonthName : public ObExprTimeBase {
+  public:
+  ObExprMonthName();
+  explicit ObExprMonthName(common::ObIAllocator& alloc);
+  virtual ~ObExprMonthName();
+  virtual int calc_result_type1(ObExprResType& type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const;
+  static int calc_month_name(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
+  static const char* get_month_name(int month);
+
+  private:
+  DISALLOW_COPY_AND_ASSIGN(ObExprMonthName);
+  typedef struct {
+    int32_t int_val;
+    const char* str_val;
+  } ObSqlMonthNameMap;
+  static const ObSqlMonthNameMap MONTH_NAME_MAP[12];
+};
+
+}  // namespace sql
+}  // namespace oceanbase
+
+#endif /* SRC_SQL_ENGINE_EXPR_OB_EXPR_TIME_H_ */