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src/sql/engine/expr/ob_expr_sign.cpp
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246
src/sql/engine/expr/ob_expr_sign.cpp
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/**
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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_sign.h"
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#include "sql/engine/expr/ob_expr_util.h"
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#include <cmath>
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#include "sql/parser/ob_item_type.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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namespace sql {
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static constexpr double DOUBLE_EPS = 1e-8;
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static constexpr float FLOAT_EPS = 1e-8;
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ObExprSign::ObExprSign(ObIAllocator& alloc) : ObFuncExprOperator(alloc, T_OP_SIGN, N_SIGN, 1, NOT_ROW_DIMENSION)
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{}
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ObExprSign::~ObExprSign()
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{}
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int ObExprSign::calc_result_type1(ObExprResType& type, ObExprResType& text, common::ObExprTypeCtx& type_ctx) const
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{
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int ret = OB_SUCCESS;
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// keep enumset as origin type
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if (lib::is_oracle_mode()) {
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type.set_number();
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type.set_scale(ObAccuracy::DDL_DEFAULT_ACCURACY2[ORACLE_MODE][ObNumberType].get_scale());
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type.set_precision(ObAccuracy::DDL_DEFAULT_ACCURACY2[ORACLE_MODE][ObNumberType].get_precision());
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} else {
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type.set_int();
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type.set_scale(common::ObAccuracy::DDL_DEFAULT_ACCURACY[common::ObIntType].scale_);
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type.set_precision(common::ObAccuracy::DDL_DEFAULT_ACCURACY[common::ObIntType].precision_);
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}
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const ObSQLSessionInfo* session = type_ctx.get_session();
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if (OB_ISNULL(session)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("session is NULL", K(ret));
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} else {
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if (ob_is_numeric_type(text.get_type())) {
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text.set_calc_type(text.get_type());
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} else {
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if (is_oracle_mode()) {
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text.set_calc_type(ObNumberType);
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} else {
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text.set_calc_type(ObDoubleType);
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}
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}
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ObExprOperator::calc_result_flag1(type, text);
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}
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return ret;
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}
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int ObExprSign::calc(ObObj& result, double val)
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{
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if (fabs(val) < FLOAT_EPS) {
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result.set_int(0);
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} else {
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result.set_int(val < 0 ? -1 : 1);
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}
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return OB_SUCCESS;
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}
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int ObExprSign::calc_result1(ObObj& result, const ObObj& obj, ObExprCtx& expr_ctx) const
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{
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int ret = OB_SUCCESS;
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if (OB_ISNULL(expr_ctx.calc_buf_)) {
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ret = OB_NOT_INIT;
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LOG_WARN("varchar buffer not init", K(ret));
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} else if (lib::is_oracle_mode()) {
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ObObjType input_type = input_types_.at(0).get_calc_meta().get_type();
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ObCollationType input_cs_type = input_types_.at(0).get_calc_meta().get_collation_type();
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if (obj.is_null()) {
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if (cast_supported(input_type, input_cs_type, ObNumberType, CS_TYPE_BINARY)) {
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result.set_null();
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} else {
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ret = OB_INVALID_NUMERIC;
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LOG_WARN("invalid type to Number", K(input_type));
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}
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/*
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* The following two branches are used to deal with the problem that
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* floating-point number's precision is too high to result overflow
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* while converting ObNumber, and go directly to floating-point
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* number's comparison
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* */
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} else if (ob_is_double_tc(obj.get_type())) {
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number::ObNumber res_nmb;
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int64_t res_int = (obj.get_double() < 0 ? -1 : 1);
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if (OB_FAIL(res_nmb.from(res_int, *expr_ctx.calc_buf_))) {
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LOG_WARN("fail to get number", K(ret));
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} else {
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result.set_number(res_nmb);
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}
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} else if (ob_is_float_tc(obj.get_type())) {
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number::ObNumber res_nmb;
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int64_t res_int = (obj.get_float() < 0 ? -1 : 1);
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if (OB_FAIL(res_nmb.from(res_int, *expr_ctx.calc_buf_))) {
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LOG_WARN("fail to get number", K(ret));
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} else {
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result.set_number(res_nmb);
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}
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} else {
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number::ObNumber nmb;
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number::ObNumber res_nmb;
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EXPR_DEFINE_CAST_CTX(expr_ctx, CM_NONE);
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EXPR_GET_NUMBER_V2(obj, nmb);
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if (OB_SUCC(ret)) {
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int64_t res_int = nmb.is_negative() ? -1 : (nmb.is_zero() ? 0 : 1);
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if (OB_FAIL(res_nmb.from(res_int, *expr_ctx.calc_buf_))) {
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LOG_WARN("fail to get number", K(ret));
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} else {
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result.set_number(res_nmb);
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}
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}
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}
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} else {
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ObObjType type = obj.get_type();
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if (obj.is_null()) {
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result.set_null();
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} else if (ob_is_int_tc(type)) {
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int64_t value = obj.get_int();
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result.set_int(value < 0 ? -1 : (0 == value ? 0 : 1));
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} else if (ob_is_uint_tc(type)) {
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uint64_t value = obj.get_uint64();
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result.set_int(0 == value ? 0 : 1);
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} else if (ob_is_number_tc(type)) {
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number::ObNumber nmb = obj.get_number();
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result.set_int(nmb.is_negative() ? -1 : (nmb.is_zero() ? 0 : 1));
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} else {
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double value = 0.0;
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EXPR_DEFINE_CAST_CTX(expr_ctx, CM_NONE);
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EXPR_GET_DOUBLE_V2(obj, value);
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if (OB_FAIL(ret)) {
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LOG_WARN("failed to cast to double", K(obj), K(ret));
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} else if (OB_FAIL(calc(result, value))) {
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LOG_WARN("failed to calc for sign", K(obj), K(ret), K(value));
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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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int calc_sign_expr(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* arg_datum = NULL;
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const ObObjType& arg_type = expr.args_[0]->datum_meta_.type_;
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const ObCollationType& arg_cs_type = expr.args_[0]->datum_meta_.cs_type_;
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const ObObjType& res_type = expr.datum_meta_.type_;
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const ObObjTypeClass& arg_tc = ob_obj_type_class(arg_type);
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if (OB_FAIL(expr.args_[0]->eval(ctx, arg_datum))) {
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LOG_WARN("eval arg failed", K(ret));
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} else if (arg_datum->is_null()) {
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if (is_oracle_mode()) {
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if (cast_supported(arg_type, arg_cs_type, ObNumberType, CS_TYPE_BINARY)) {
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res_datum.set_null();
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} else {
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ret = OB_INVALID_NUMERIC;
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LOG_WARN("invalid type to Number", K(arg_type));
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}
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} else {
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res_datum.set_null();
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}
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} else {
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int64_t res_int = 0;
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switch (arg_tc) {
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case ObIntTC: {
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int64_t v = arg_datum->get_int();
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res_int = v < 0 ? -1 : (0 == v ? 0 : 1);
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break;
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}
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case ObUIntTC: {
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res_int = arg_datum->get_uint64() == 0 ? 0 : 1;
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break;
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}
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case ObNumberTC: {
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number::ObNumber nmb(arg_datum->get_number());
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res_int = nmb.is_negative() ? -1 : (nmb.is_zero() ? 0 : 1);
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break;
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}
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case ObFloatTC: {
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float v = arg_datum->get_float();
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if (is_mysql_mode() && fabsf(v) < FLOAT_EPS) {
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res_int = 0;
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} else {
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res_int = v < 0 ? -1 : 1;
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}
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break;
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}
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case ObDoubleTC: {
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double v = arg_datum->get_double();
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if (is_mysql_mode() && fabs(v) < DOUBLE_EPS) {
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res_int = 0;
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} else {
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res_int = v < 0 ? -1 : 1;
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}
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break;
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}
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default: {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("unexpected arg_type", K(ret), K(arg_type));
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break;
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}
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}
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if (ObNumberType == res_type) {
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number::ObNumber res_nmb;
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ObNumStackOnceAlloc tmp_alloc;
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if (OB_FAIL(res_nmb.from(res_int, tmp_alloc))) {
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LOG_WARN("get number from int failed", K(ret), K(res_int));
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} else {
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res_datum.set_number(res_nmb);
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}
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} else if (ObIntType == res_type) {
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res_datum.set_int(res_int);
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} else {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("unexpected res_type", K(ret), K(res_type));
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}
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}
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return ret;
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}
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int ObExprSign::cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
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{
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int ret = OB_SUCCESS;
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UNUSED(expr_cg_ctx);
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UNUSED(raw_expr);
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rt_expr.eval_func_ = calc_sign_expr;
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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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