88 lines
3.1 KiB
C++
88 lines
3.1 KiB
C++
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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*/
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#ifndef OCEANBASE_SQL_EXPR_FUNC_REVERSE_
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#define OCEANBASE_SQL_EXPR_FUNC_REVERSE_
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#include "sql/engine/expr/ob_expr_operator.h"
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namespace oceanbase
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{
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namespace sql
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{
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class ObExprReverse : public ObStringExprOperator
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{
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public:
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explicit ObExprReverse(common::ObIAllocator &alloc);
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virtual ~ObExprReverse();
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virtual int calc_result_type1(ObExprResType &type,
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ObExprResType &type1,
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common::ObExprTypeCtx &type_ctx) const;
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virtual int cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const;
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static int do_reverse(const common::ObString &input_str,
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const common::ObCollationType &cs_type,
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common::ObIAllocator *allocator,
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common::ObString &res_str);
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private:
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DISALLOW_COPY_AND_ASSIGN(ObExprReverse);
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};
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inline int ObExprReverse::calc_result_type1(ObExprResType &type,
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ObExprResType &type1,
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common::ObExprTypeCtx &type_ctx) const
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{
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UNUSED(type_ctx);
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int ret = OB_SUCCESS;
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type1.set_calc_type(common::ObVarcharType);
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type1.set_calc_collation_type(type1.get_collation_type());
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if (lib::is_mysql_mode()) {
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if (ObTextType == type1.get_type()
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|| ObMediumTextType == type1.get_type()
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|| ObLongTextType == type1.get_type()) {
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type.set_type(ObLongTextType);
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const int32_t mbmaxlen = 4;
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const int32_t default_text_length =
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ObAccuracy::DDL_DEFAULT_ACCURACY[ObLongTextType].get_length() / mbmaxlen;
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type.set_length(default_text_length);
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} else {
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type.set_varchar();
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if (ObTinyTextType == type1.get_type()) {
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type.set_length(OB_MAX_TINYTEXT_LENGTH - 1);
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} else {
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type.set_length(type1.get_length());
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}
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}
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ret = aggregate_charsets_for_string_result(type, &type1, 1, type_ctx.get_coll_type());
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} else {
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if (ob_is_character_type(type1.get_type(), type1.get_collation_type())
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|| ob_is_varbinary_or_binary(type1.get_type(), type1.get_collation_type())
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|| ObNullType == type1.get_type()) {
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type.set_type(type1.get_type());
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type.set_collation_type(type1.get_collation_type());
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type.set_collation_level(type1.get_collation_level());
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type.set_length(type1.get_length());
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} else {
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ret = OB_ERR_INVALID_TYPE_FOR_OP;
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LOG_USER_ERROR(OB_ERR_INVALID_TYPE_FOR_OP,
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ob_obj_type_str(ObCharType),
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ob_obj_type_str(type1.get_type()));
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}
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}
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return ret;
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}
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}
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}
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#endif /* OCEANBASE_SQL_EXPR_FUNC_REVERSE_ */
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