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Copy pathob_expr_chr.cpp
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138 lines (126 loc) · 4.14 KB
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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.
*/
#define USING_LOG_PREFIX SQL_ENG
#include "sql/engine/expr/ob_expr_chr.h"
#include "sql/session/ob_sql_session_info.h"
#include <string.h>
#include "lib/oblog/ob_log.h"
#include "objit/common/ob_item_type.h"
using namespace oceanbase::common;
namespace oceanbase
{
namespace sql
{
ObExprChr::ObExprChr(ObIAllocator &alloc)
: ObStringExprOperator(alloc, T_FUN_SYS_CHR, N_CHR, 1, VALID_FOR_GENERATED_COL)
{
}
ObExprChr::~ObExprChr()
{
}
inline int ObExprChr::calc_result_type1(ObExprResType &type,
ObExprResType &text,
common::ObExprTypeCtx &type_ctx) const
{
int ret = OB_SUCCESS;
const ObSQLSessionInfo *session = type_ctx.get_session();
if (OB_ISNULL(session)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("session is NULL", K(ret));
} else {
int64_t mbmaxlen = 0;
text.set_calc_type(common::ObDoubleType);
type.set_varchar();
type.set_collation_level(common::CS_LEVEL_COERCIBLE);
type.set_collation_type(session->get_nls_collation());
type.set_length_semantics(session->get_actual_nls_length_semantics());
if (LS_BYTE == type.get_length_semantics()) {
OZ(ObCharset::get_mbmaxlen_by_coll(type.get_collation_type(), mbmaxlen));
OX(type.set_length(mbmaxlen));
} else {
type.set_length(1);
}
}
return ret;
}
int ObExprChr::number2varchar(ObString &str_result,
const double double_val,
ObIAllocator &alloc)
{
int ret = OB_SUCCESS;
int64_t int_val = static_cast<int64_t>(double_val);
// 对于chr(n), floor(n) ∈ [0, UINT32_MAX]，如果不在这个范围内会报错numeric overflow。
// 奇怪的是当 0 < n < 1时，n也是满足条件的，但是oracle也报了numeric overflow，可能跟
// oracle的执行框架有关，这里做了兼容。
if (floor(double_val) < 0 ||
floor(double_val) > UINT32_MAX ||
(double_val > 0 && double_val < 1)) {
ret = OB_INTEGER_PRECISION_OVERFLOW;
str_result.reset();
} else {
uint32_t num = static_cast<uint32_t>(int_val);
int length = 0;
if (num & 0xFF000000UL) {
length = 4;
} else if (num & 0xFF0000UL) {
length = 3;
} else if (num & 0xFF00UL) {
length = 2;
} else {
length = 1;
}
char *buf = static_cast<char *>(alloc.alloc(length));
if(OB_ISNULL(buf)) {
ret = OB_ALLOCATE_MEMORY_FAILED;
LOG_ERROR("alloc memory failed", K(ret));
} else {
for (int i = 0; i < length; ++i) {
buf[length - i - 1] = static_cast<char>(num >> (8 * i));
}
str_result.assign_ptr(buf, static_cast<ObString::obstr_size_t>(length));
}
}
return ret;
}
int ObExprChr::calc_chr_expr(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res_datum)
{
int ret = OB_SUCCESS;
ObDatum *arg = NULL;
if (OB_FAIL(expr.args_[0]->eval(ctx, arg))) {
LOG_WARN("eval arg failed", K(ret));
} else if (arg->is_null()) {
res_datum.set_null();
} else {
ObExprStrResAlloc res_alloc(expr, ctx);
double arg_double = arg->get_double();
ObString res_str;
if (OB_FAIL(ObExprChr::number2varchar(res_str, arg_double, res_alloc))) {
LOG_WARN("number2varchar failed", K(ret), K(arg_double));
} else if (res_str.empty()) {
res_datum.set_null();
} else {
res_datum.set_string(res_str);
}
}
return ret;
}
int ObExprChr::cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr,
ObExpr &rt_expr) const
{
int ret = OB_SUCCESS;
UNUSED(expr_cg_ctx);
UNUSED(raw_expr);
rt_expr.eval_func_ = calc_chr_expr;
return ret;
}
} //end namespace sql
} //end namespace oceanbase