69 lines
2.3 KiB
C++
69 lines
2.3 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_ENGINE_EXPR_OB_EXPR_UNHEX_
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#define OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_UNHEX_
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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 ObExprUnhex : public ObStringExprOperator
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{
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public:
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explicit ObExprUnhex(common::ObIAllocator &alloc);
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virtual ~ObExprUnhex();
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virtual int calc_result_type1(ObExprResType &type,
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ObExprResType &text,
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common::ObExprTypeCtx &type_ctx) const;
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virtual int cg_expr(ObExprCGCtx &op_cg_ctx,
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const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const override;
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static int eval_unhex(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res_datum);
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private:
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DISALLOW_COPY_AND_ASSIGN(ObExprUnhex);
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};
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inline int ObExprUnhex::calc_result_type1(ObExprResType &type,
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ObExprResType &text,
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common::ObExprTypeCtx &type_ctx) const
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{
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int ret = OB_SUCCESS;
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UNUSED(type_ctx);
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if (!ob_is_text_tc(text.get_type())) {
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text.set_calc_type(common::ObVarcharType);
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}
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if (ObTinyTextType == text.get_type()) {
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const int32_t MAX_TINY_TEXT_BUFFER_SIZE = 383;
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type.set_varbinary();
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type.set_length(MAX_TINY_TEXT_BUFFER_SIZE);
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} else if (ObTextType == text.get_type()
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|| ObMediumTextType == text.get_type()
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|| ObLongTextType == text.get_type()) {
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type.set_type(ObLongTextType);
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type.set_length(OB_MAX_LONGTEXT_LENGTH);
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} else {
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type.set_varchar();
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type.set_length(text.get_length() / 2 + (text.get_length() % 2));
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}
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type.set_collation_level(common::CS_LEVEL_COERCIBLE);
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type.set_collation_type(common::CS_TYPE_BINARY);
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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_ENGINE_EXPR_OB_EXPR_UNHEX_ */
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