143 lines
4.7 KiB
C++
143 lines
4.7 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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#define USING_LOG_PREFIX SQL_ENG
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#include "ob_expr_conv.h"
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//#include <m_string.h>
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//#include "lib/regex/include/m_string.h"
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#include "lib/oblog/ob_log.h"
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#include "objit/common/ob_item_type.h"
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//#include "sql/engine/expr/ob_expr_promotion_util.h"
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#include "sql/session/ob_sql_session_info.h"
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using namespace oceanbase::common;
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using namespace oceanbase::sql;
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namespace oceanbase
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{
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namespace sql
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{
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ObExprConv::ObExprConv(ObIAllocator &alloc)
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: ObStringExprOperator(alloc, T_OP_CONV, N_CONV, 3)
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{
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}
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ObExprConv::~ObExprConv()
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{
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// TODO Auto-generated destructor stub
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}
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/*
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* ObExprConv(str/int, base_from,
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* base_to)的语义是将第一个参数根据base_from的进制转换为base_to的进制，并以字符串的形式输出
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*
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* 框架无法对第一个参数进行转换，但可以对第二第三个参数进行转换
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*/
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inline int ObExprConv::calc_result_type3(ObExprResType &type,
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ObExprResType &type1,
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ObExprResType &type2,
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ObExprResType &type3,
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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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CK (OB_NOT_NULL(type_ctx.get_session()));
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if (OB_SUCC(ret)) {
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type.set_varchar();
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type.set_collation_type(get_default_collation_type(type.get_type(), *type_ctx.get_session()));
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type.set_collation_level(CS_LEVEL_COERCIBLE);
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type.set_length(64);
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}
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// Check ObUInt64Type to prevent repeated implicit cast
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if (type1.get_type() == ObBitType) {
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type1.set_calc_type(ObBitType);
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type_ctx.set_cast_mode(type_ctx.get_cast_mode() | CM_NO_RANGE_CHECK);
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} else {
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type1.set_calc_type_default_varchar();
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}
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type2.set_calc_type(ObInt32Type);
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type3.set_calc_type(ObInt32Type); // 可以是有符号数，表示type1是有符号数
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return ret;
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}
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int ObExprConv::cg_expr(ObExprCGCtx &op_cg_ctx,
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const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const
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{
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int ret = OB_SUCCESS;
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UNUSED(op_cg_ctx);
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UNUSED(raw_expr);
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rt_expr.eval_func_ = ObExprConv::eval_conv;
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return ret;
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}
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int ObExprConv::eval_conv(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res_datum)
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{
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int ret = OB_SUCCESS;
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ObDatum *param_0 = NULL;
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ObDatum *param_1 = NULL;
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ObDatum *param_2 = NULL;
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if (OB_FAIL(expr.args_[0]->eval(ctx, param_0))
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|| OB_FAIL(expr.args_[1]->eval(ctx, param_1))
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|| OB_FAIL(expr.args_[2]->eval(ctx, param_2))) {
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LOG_WARN("fail to eval conv", K(ret), K(expr));
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} else if (param_0->is_null() || param_1->is_null() || param_2->is_null()) {
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res_datum.set_null();
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} else {
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int32_t from_base = param_1->get_int32();
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int32_t to_base = param_2->get_int32();
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int64_t dec = 0;
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if (INT32_MIN == from_base || INT32_MIN == to_base
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|| abs(from_base) < MIN_BASE || abs(from_base) > MAX_BASE
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|| abs(to_base) < MIN_BASE || abs(to_base) > MAX_BASE) {
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res_datum.set_null();
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} else {
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char *res_ptr = expr.get_str_res_mem(ctx, MAX_LENGTH);
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if (NULL != res_ptr) {
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if (ObBitType == expr.args_[0]->datum_meta_.type_) {
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dec = param_0->get_uint();
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} else {
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ObString str = param_0->get_string();
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int err = 0; // though err != 0 , we still use dec as the valid argument of next step.
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if (from_base < 0) {
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dec = ObCharset::strntoll(str.ptr(), str.length(), -from_base, &err);
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} else {
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dec = static_cast<int64_t>(ObCharset::strntoull(str.ptr(),
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str.length(),
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from_base,
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&err));
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}
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}
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char *ptr = NULL;
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if (OB_ISNULL(ptr = ObCharset::lltostr(dec, res_ptr, to_base, 1))) {
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res_datum.set_null();
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} else {
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res_datum.set_string(res_ptr, static_cast<int64_t>(ptr - res_ptr));
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}
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} else {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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LOG_ERROR("alloc memory failed", K(ret));
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}
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}
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}
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return ret;
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}
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} //namespace sql
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} //namespace oceanbase
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