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2021-05-31 22:56:52 +08:00
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src/sql/engine/expr/ob_expr_neg.cpp 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.
*/
#define USING_LOG_PREFIX SQL_ENG
#include "sql/engine/expr/ob_expr_neg.h"
#include "share/object/ob_obj_cast.h"
#include "share/datum/ob_datum_util.h"
#include "sql/engine/expr/ob_expr_result_type_util.h"
#include "sql/session/ob_sql_session_info.h"
namespace oceanbase {
using namespace common;
namespace sql {
template <ObObjTypeClass>
static int eval_neg_func(const ObExpr& expr, ObEvalCtx& eval_ctx, ObDatum& expr_datum)
{
UNUSED(expr);
UNUSED(eval_ctx);
UNUSED(expr_datum);
int ret = OB_ERR_INVALID_TYPE_FOR_OP;
return ret;
}
static int check_expr_and_eval_param(const ObExpr& expr, ObEvalCtx& eval_ctx, ObDatum*& param_datum, bool& found_null)
{
int ret = OB_SUCCESS;
param_datum = NULL;
found_null = false;
if (OB_UNLIKELY(expr.type_ != T_OP_NEG) || OB_ISNULL(expr.args_) || OB_UNLIKELY(expr.arg_cnt_ != 1) ||
OB_ISNULL(expr.args_[0])) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("invalid argument", K(ret));
} else if (OB_FAIL(expr.args_[0]->eval(eval_ctx, param_datum))) {
LOG_WARN("failed to eval", K(ret));
} else if (param_datum->is_null()) {
found_null = true;
} else {
LOG_DEBUG("succeed to check expr and eval param", K(ret));
}
return ret;
}
#define DEF_EVAL_NEG_FUNC(obj_tc) \
template <> \
int eval_neg_func<obj_tc>(const ObExpr& expr, ObEvalCtx& eval_ctx, ObDatum& expr_datum)
DEF_EVAL_NEG_FUNC(ObNullTC)
{
int ret = OB_SUCCESS;
UNUSED(expr);
UNUSED(eval_ctx);
expr_datum.set_null();
return ret;
}
DEF_EVAL_NEG_FUNC(ObIntTC)
{
int ret = OB_SUCCESS;
ObDatum* param = NULL;
bool found_null = false;
if (OB_FAIL(check_expr_and_eval_param(expr, eval_ctx, param, found_null))) {
LOG_WARN("failed to check expr and eval", K(ret));
} else if (found_null) {
expr_datum.set_null();
} else if (param->get_int() == INT64_MIN) {
// following is compatiable with mysql:
// 1. select -c1 from t1; will give error if c1 is INT64_MIN
// 2. select --9223372036854775808 from dual; will return 9223372036854775808;
// will be handled in eval func of ObNumberTC. see ObExprNeg::calc_param_type(),
// type of -9223372036854775808 will be decimal.
ret = OB_OPERATE_OVERFLOW;
} else {
expr_datum.set_int(-param->get_int());
}
return ret;
}
DEF_EVAL_NEG_FUNC(ObUIntTC)
{
int ret = OB_SUCCESS;
ObDatum* param = NULL;
bool found_null = false;
if (OB_FAIL(check_expr_and_eval_param(expr, eval_ctx, param, found_null))) {
LOG_WARN("failed to check expr and eval", K(ret));
} else if (found_null) {
expr_datum.set_null();
} else {
if (param->get_uint64() > (1UL + INT64_MAX)) {
ret = OB_OPERATE_OVERFLOW;
} else {
expr_datum.set_int(-param->get_uint64());
}
}
return ret;
}
DEF_EVAL_NEG_FUNC(ObFloatTC)
{
int ret = OB_SUCCESS;
ObDatum* param = NULL;
bool found_null = false;
if (OB_FAIL(check_expr_and_eval_param(expr, eval_ctx, param, found_null))) {
LOG_WARN("failed to check expr and eval", K(ret));
} else if (found_null) {
expr_datum.set_null();
} else {
expr_datum.set_float(-param->get_float());
}
return ret;
}
DEF_EVAL_NEG_FUNC(ObDoubleTC)
{
int ret = OB_SUCCESS;
ObDatum* param = NULL;
bool found_null = false;
if (OB_FAIL(check_expr_and_eval_param(expr, eval_ctx, param, found_null))) {
LOG_WARN("failed to check expr and eval", K(ret));
} else if (found_null) {
expr_datum.set_null();
} else {
expr_datum.set_double(-param->get_double());
}
return ret;
}
DEF_EVAL_NEG_FUNC(ObNumberTC)
{
int ret = OB_SUCCESS;
ObDatum* param = NULL;
bool found_null = false;
if (OB_FAIL(check_expr_and_eval_param(expr, eval_ctx, param, found_null))) {
LOG_WARN("failed to check expr and eval", K(ret));
} else if (found_null) {
expr_datum.set_null();
} else {
number::ObNumber param_nmb(param->get_number());
expr_datum.set_number(param_nmb.negate());
}
return ret;
}
static ObExpr::EvalFunc eval_neg_funcs[ObMaxTC];
template <int N>
struct ObEvalNegFuncIniter {
static int init_array()
{
eval_neg_funcs[N] = &eval_neg_func<static_cast<ObObjTypeClass>(N)>;
return 0;
}
};
static bool init_ret = ObArrayConstIniter<ObMaxTC, ObEvalNegFuncIniter>::init();
static_assert(ObMaxTC == sizeof(eval_neg_funcs) / sizeof(void*), "unexpected size");
REG_SER_FUNC_ARRAY(OB_SFA_SQL_EXPR_NEG_EVAL, eval_neg_funcs, ARRAYSIZEOF(eval_neg_funcs));
ObExprNeg::ObExprNeg(ObIAllocator& alloc) : ObExprOperator(alloc, T_OP_NEG, N_NEG, 1, NOT_ROW_DIMENSION){};
int ObExprNeg::calc_result_type1(ObExprResType& type, ObExprResType& type1, ObExprTypeCtx& type_ctx) const
{
UNUSED(type_ctx);
int ret = OB_SUCCESS;
static const int16_t NEG_PRECISION_OFFSET = 1;
const ObSQLSessionInfo* session = dynamic_cast<const ObSQLSessionInfo*>(type_ctx.get_session());
if (OB_ISNULL(session)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("invalid argument", K(ret));
} else if (OB_LIKELY(NOT_ROW_DIMENSION == row_dimension_)) {
// result type
ObObjType itype = ObMaxType;
if (OB_SUCC(ObExprResultTypeUtil::get_neg_result_type(itype, type1.get_type()))) {
if (ObMaxType == itype) {
ret = OB_ERR_INVALID_TYPE_FOR_OP;
LOG_WARN("unsupported type for neg", K(ret), K(type1), K(itype));
} else {
type.set_type(itype);
}
}
if (OB_SUCC(ret)) {
// collation
// null flag
ObExprOperator::calc_result_flag1(type, type1);
if (lib::is_oracle_mode()) {
type.set_scale(ObAccuracy::DDL_DEFAULT_ACCURACY2[ORACLE_MODE][type.get_type()].get_scale());
type.set_precision(ObAccuracy::DDL_DEFAULT_ACCURACY2[ORACLE_MODE][type.get_type()].get_precision());
} else {
// scale
type.set_scale(type1.get_scale());
if (OB_LIKELY(0 < type1.get_precision())) {
if (type1.get_type() == ObUNumberType) {
type.set_precision(static_cast<int16_t>(type1.get_precision()));
} else {
type.set_precision(static_cast<int16_t>(type1.get_precision() + NEG_PRECISION_OFFSET));
}
}
}
if (session->use_static_typing_engine()) {
ObObjType res_param_type = ObMaxType;
ObObjType result_type = ObMaxType;
if (OB_FAIL(calc_param_type(type1, res_param_type, result_type))) {
LOG_WARN("failed to calc param type", K(ret));
} else {
LOG_DEBUG("calc reuslt type", K(res_param_type), K(result_type));
type.set_type(result_type);
type1.set_calc_type(res_param_type);
}
} else {
if (type1.is_literal()) {
// Set type to ObNumberType to make sure no overflow for literal.
if (ObUInt64Type == type1.get_type() ||
(ObIntType == type1.get_type() && INT64_MIN == type1.get_param().get_int())) {
type.set_type(ObNumberType);
type1.set_calc_type(ObNumberType);
}
}
}
}
} else {
ret = OB_ERR_INVALID_TYPE_FOR_OP;
}
return ret;
}
int ObExprNeg::calc_result1(ObObj& result, const ObObj& obj, ObExprCtx& expr_ctx) const
{
int ret = OB_SUCCESS;
if (OB_ISNULL(expr_ctx.calc_buf_)) {
ret = OB_ALLOCATE_MEMORY_FAILED;
LOG_ERROR("allocator null pointer", K(ret), K(expr_ctx.calc_buf_));
} else {
EXPR_DEFINE_CAST_CTX(expr_ctx, CM_NONE);
ret = calc_(obj, result, cast_ctx);
}
return ret;
}
int ObExprNeg::calc_(const ObObj& param, ObObj& res, ObCastCtx& cast_ctx)
{
int ret = OB_SUCCESS;
res.set_type(param.get_type());
switch (param.get_type_class()) {
case ObUIntTC: {
if (OB_UNLIKELY(param.get_uint64() > INT64_MAX + 1UL)) {
LOG_WARN("BIGINT value is out of range", K(param));
ret = OB_OPERATE_OVERFLOW;
} else {
res.set_int(-param.get_uint64());
}
break;
}
case ObBitTC: {
if (OB_UNLIKELY(param.get_bit() > INT64_MAX + 1UL)) {
LOG_WARN("BIGINT value is out of range", K(param));
ret = OB_OPERATE_OVERFLOW;
} else {
res.set_int(-param.get_bit());
}
break;
}
case ObYearTC: {
int64_t year = 0;
EXPR_GET_INT64_V2(param, year);
if (OB_SUCC(ret)) {
res.set_int(-year);
}
break;
};
case ObIntTC: {
if (OB_UNLIKELY(INT64_MIN == param.get_int())) {
ret = OB_OPERATE_OVERFLOW;
} else {
res.set_int(-param.get_int());
}
break;
}
case ObFloatTC: {
res.set_float(-param.get_float());
break;
}
case ObDoubleTC: {
res.set_double(-param.get_double());
break;
}
case ObNumberTC: {
if (OB_ISNULL(cast_ctx.allocator_v2_)) {
LOG_WARN("allocator null pointer", K(param));
ret = OB_ALLOCATE_MEMORY_FAILED;
} else {
number::ObNumber param_nmb = param.get_number();
number::ObNumber res_nmb;
ret = param_nmb.negate(res_nmb, *cast_ctx.allocator_v2_);
if (OB_SUCC(ret)) {
res.set_number(res_nmb);
}
}
break;
}
case ObDateTC:
case ObDateTimeTC:
case ObTimeTC:
case ObTextTC: // TODO texttc share the stringtc temporarily
case ObStringTC: {
if (OB_ISNULL(cast_ctx.allocator_v2_)) {
LOG_WARN("allocator null pointer", K(param));
ret = OB_ALLOCATE_MEMORY_FAILED;
} else {
if (lib::is_oracle_mode()) {
number::ObNumber number_v1;
EXPR_GET_NUMBER_V2(param, number_v1);
if (OB_FAIL(ret)) {
LOG_WARN("fail to cast object", K(param), K(ret));
} else {
res.set_number(number_v1.negate());
}
} else {
double double_v1 = 0;
EXPR_GET_DOUBLE_V2(param, double_v1);
if (OB_FAIL(ret)) {
LOG_WARN("fail to cast object", K(param), K(ret));
} else {
res.set_double(-double_v1);
}
}
}
break;
}
case ObExtendTC:
case ObRawTC: {
ret = OB_ERR_INVALID_TYPE_FOR_OP;
break;
}
case ObEnumSetTC: {
if (OB_UNLIKELY(param.get_uint64() > INT64_MAX + 1UL)) {
LOG_WARN("BIGINT value is out of range", K(param));
ret = OB_OPERATE_OVERFLOW;
} else {
res.set_int(-param.get_uint64());
}
break;
}
default: {
res.set_null();
break;
}
}
return ret;
}
int ObExprNeg::cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
{
int ret = OB_SUCCESS;
UNUSED(op_cg_ctx);
UNUSED(raw_expr);
if (OB_UNLIKELY(T_OP_NEG != rt_expr.type_) || OB_ISNULL(rt_expr.args_) || OB_UNLIKELY(rt_expr.arg_cnt_ != 1) ||
OB_ISNULL(rt_expr.args_[0])) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("invalid argument", K(ret));
} else {
ObObjTypeClass param_tc = OBJ_TYPE_TO_CLASS[rt_expr.args_[0]->datum_meta_.type_];
rt_expr.eval_func_ = eval_neg_funcs[param_tc];
}
return ret;
}
int ObExprNeg::calc_param_type(const ObExprResType& param_type, ObObjType& calc_type, ObObjType& result_type)
{
int ret = OB_SUCCESS;
switch (OBJ_TYPE_TO_CLASS[param_type.get_type()]) {
case ObUIntTC:
case ObBitTC:
case ObEnumSetTC: {
calc_type = ObUInt64Type;
result_type = ObIntType;
if (ObUInt64Type == param_type.get_type() && param_type.is_literal()) {
result_type = calc_type = ObNumberType;
}
break;
}
case ObYearTC:
case ObIntTC: {
if (ObIntType == param_type.get_type() && param_type.is_literal()) {
const ObObj& obj = param_type.get_param();
if (OB_UNLIKELY(!obj.is_int())) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpected obj type", K(ret), K(obj), K(param_type));
} else if (INT64_MIN == obj.get_int()) {
// select --9223372036854775808;
// -9223372036854775808 is a decimal. otherwise neg will overflow.
result_type = calc_type = ObNumberType;
} else {
result_type = calc_type = ObIntType;
}
} else {
result_type = calc_type = ObIntType;
}
break;
}
case ObFloatTC: {
result_type = calc_type = ObFloatType;
break;
}
case ObDoubleTC: {
result_type = calc_type = ObDoubleType;
break;
}
case ObNumberTC: {
result_type = calc_type = ObNumberType;
break;
}
case ObDateTC:
case ObDateTimeTC:
case ObTimeTC:
case ObTextTC:
case ObStringTC: {
if (lib::is_oracle_mode()) {
result_type = calc_type = ObNumberType;
} else {
result_type = calc_type = ObDoubleType;
}
break;
}
case ObExtendTC:
case ObRawTC: {
ret = OB_ERR_INVALID_TYPE_FOR_OP;
break;
}
default: {
result_type = calc_type = ObNullType;
break;
}
}
return ret;
}
} // end namespace sql
} // end namespace oceanbase