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src/sql/engine/expr/ob_expr_lower.h Normal file
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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 OCEANBASE_SQL_ENGINE_EXPR_LOWER_
#define OCEANBASE_SQL_ENGINE_EXPR_LOWER_
#include "sql/engine/expr/ob_expr_operator.h"
namespace oceanbase {
namespace sql {
class ObExprLowerUpper : public ObStringExprOperator {
public:
static const char SEPARATOR_IN_NLS_SORT_PARAM = '=';
ObExprLowerUpper(common::ObIAllocator& alloc, ObExprOperatorType type, const char* name, int32_t param_num);
virtual ~ObExprLowerUpper()
{}
// For lower/upper of mysql and oracle
virtual int calc_result_type1(ObExprResType& type, ObExprResType& text, common::ObExprTypeCtx& type_ctx) const;
virtual int calc_result1(common::ObObj& result, const common::ObObj& text, common::ObExprCtx& expr_ctx) const;
// For oracle only nls_lower/nls_upper
virtual int calc_result_typeN(
ObExprResType& type, ObExprResType* texts, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;
virtual int calc_resultN(
common::ObObj& result, const common::ObObj* objs, int64_t param_num, common::ObExprCtx& expr_ctx) const;
static int calc_common(
const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum, bool lower, common::ObCollationType cs_type);
static int calc_nls_common(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum, bool lower);
int cg_expr_common(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const;
int cg_expr_nls_common(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const;
protected:
virtual int calc(const common::ObCollationType cs_type, char* src, int32_t src_len, char* dest, int32_t det_len,
int32_t& out_len) const = 0;
virtual int32_t get_case_mutiply(const common::ObCollationType cs_type) const = 0;
private:
int calc(common::ObObj& result, const common::ObString& text, common::ObCollationType cs_type,
common::ObIAllocator& calc_buf) const;
DISALLOW_COPY_AND_ASSIGN(ObExprLowerUpper);
};
class ObExprLower : public ObExprLowerUpper {
public:
explicit ObExprLower(common::ObIAllocator& alloc);
virtual ~ObExprLower()
{}
virtual int calc(const common::ObCollationType cs_type, char* src, int32_t src_len, char* dest, int32_t det_len,
int32_t& out_len) const;
virtual int32_t get_case_mutiply(const common::ObCollationType cs_type) const;
virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
static int calc_lower(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
private:
DISALLOW_COPY_AND_ASSIGN(ObExprLower);
};
class ObExprUpper : public ObExprLowerUpper {
public:
explicit ObExprUpper(common::ObIAllocator& alloc);
virtual ~ObExprUpper()
{}
virtual int calc(const common::ObCollationType cs_type, char* src, int32_t src_len, char* dest, int32_t det_len,
int32_t& out_len) const;
virtual int32_t get_case_mutiply(const common::ObCollationType cs_type) const;
virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
static int calc_upper(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
private:
DISALLOW_COPY_AND_ASSIGN(ObExprUpper);
};
class ObExprNlsLower : public ObExprLowerUpper {
public:
explicit ObExprNlsLower(common::ObIAllocator& alloc);
virtual ~ObExprNlsLower()
{}
virtual int calc(const common::ObCollationType cs_type, char* src, int32_t src_len, char* dest, int32_t det_len,
int32_t& out_len) const;
virtual int32_t get_case_mutiply(const common::ObCollationType cs_type) const;
virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
static int calc_lower(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
private:
DISALLOW_COPY_AND_ASSIGN(ObExprNlsLower);
};
class ObExprNlsUpper : public ObExprLowerUpper {
public:
explicit ObExprNlsUpper(common::ObIAllocator& alloc);
virtual ~ObExprNlsUpper()
{}
virtual int calc(const common::ObCollationType cs_type, char* src, int32_t src_len, char* dest, int32_t det_len,
int32_t& out_len) const;
virtual int32_t get_case_mutiply(const common::ObCollationType cs_type) const;
virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
static int calc_upper(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
private:
DISALLOW_COPY_AND_ASSIGN(ObExprNlsUpper);
};
} // namespace sql
} // namespace oceanbase
#endif /* OCEANBASE_SQL_ENGINE_EXPR_LOWER_ */