135 lines
4.6 KiB
C++
135 lines
4.6 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 <math.h>
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#include "share/object/ob_obj_cast.h"
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#include "sql/engine/expr/ob_expr_log.h"
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#include "sql/engine/expr/ob_expr_pow.h"
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#include "sql/session/ob_sql_session_info.h"
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#include "lib/number/ob_number_v2.h"
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#include "sql/engine/expr/ob_expr_ln.h"
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namespace oceanbase
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{
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using namespace oceanbase::common;
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namespace sql
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{
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ObExprLog::ObExprLog(ObIAllocator &alloc)
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: ObExprOperator(alloc, T_FUN_SYS_LOG, N_LOG, 2, NOT_ROW_DIMENSION)
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{
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}
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int ObExprLog::calc_result_type2(ObExprResType &type,
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ObExprResType &type1,
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ObExprResType &type2,
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ObExprTypeCtx &type_ctx) const
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{
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int ret = OB_SUCCESS;
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if (lib::is_mysql_mode()) {
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if (NOT_ROW_DIMENSION != row_dimension_) {
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ret = OB_ERR_INVALID_TYPE_FOR_OP; // arithmetic not support row
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} else if (ObMaxType == type1.get_type() || ObMaxType == type2.get_type()) {
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ret = OB_ERR_INVALID_TYPE_FOR_OP;
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} else {
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type.set_double();
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type1.set_calc_type(type.get_type());
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type2.set_calc_type(type.get_type());
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ObExprOperator::calc_result_flag2(type, type1, type2);
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}
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} else if (OB_FAIL(calc_trig_function_result_type2(type, type1, type2, type_ctx))) {
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LOG_WARN("failed to calc_trig_function_result_type2", K(ret));
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} else {/*do nothing*/}
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return ret;
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}
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int calc_log_expr_double(const ObExpr &expr, ObEvalCtx &ctx,
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ObDatum &res_datum)
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{
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int ret = OB_SUCCESS;
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ObDatum *base = NULL;
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ObDatum *x = NULL;
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if (OB_FAIL(expr.args_[0]->eval(ctx, base)) ||
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OB_FAIL(expr.args_[1]->eval(ctx, x))) {
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LOG_WARN("eval arg failed", K(ret), K(expr));
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} else if (base->is_null() || x->is_null()) {
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res_datum.set_null();
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} else if (lib::is_mysql_mode() && (x->get_double() <= 0 || base->get_double() <= 0)) {
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LOG_USER_WARN(OB_EER_INVALID_ARGUMENT_FOR_LOGARITHM);
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res_datum.set_null();
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} else if (OB_FAIL(ObExprPow::safe_set_double(res_datum,
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std::log(x->get_double()) / std::log(base->get_double())))) {
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if (lib::is_mysql_mode() && OB_OPERATE_OVERFLOW == ret) {
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ret = OB_SUCCESS;
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LOG_USER_WARN(OB_EER_INVALID_ARGUMENT_FOR_LOGARITHM);
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res_datum.set_null();
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} else {
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LOG_WARN("set double failed", K(ret), K(base->get_double()), K(x->get_double()));
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}
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}
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return ret;
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}
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int calc_log_expr_number(const ObExpr &expr, ObEvalCtx &ctx,
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ObDatum &res_datum)
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{
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int ret = OB_SUCCESS;
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ObDatum *base = NULL;
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ObDatum *x = NULL;
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if (OB_FAIL(expr.args_[0]->eval(ctx, base)) ||
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OB_FAIL(expr.args_[1]->eval(ctx, x))) {
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LOG_WARN("eval arg failed", K(ret), K(expr));
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} else if (base->is_null() || x->is_null()) {
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res_datum.set_null();
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} else {
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const number::ObNumber base_nmb(base->get_number());
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const number::ObNumber x_nmb(x->get_number());
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number::ObNumber res_nmb;
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ObEvalCtx::TempAllocGuard alloc_guard(ctx);
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if (OB_FAIL(x_nmb.log(base_nmb, res_nmb, alloc_guard.get_allocator()))) {
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LOG_WARN("calc log failed", K(ret), K(base_nmb), K(x_nmb), K(res_nmb));
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} else {
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res_datum.set_number(res_nmb);
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}
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}
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return ret;
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}
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int ObExprLog::cg_expr(ObExprCGCtx &expr_cg_ctx, 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(expr_cg_ctx);
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UNUSED(raw_expr);
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if (OB_UNLIKELY(2 != raw_expr.get_param_count())) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("raw_expr should got two arg", K(ret), K(raw_expr));
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} else {
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const ObObjType base_res_type = rt_expr.args_[0]->datum_meta_.type_;
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const ObObjType x_res_type = rt_expr.args_[1]->datum_meta_.type_;
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if (ObNumberType == base_res_type && ObNumberType == x_res_type) {
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rt_expr.eval_func_ = calc_log_expr_number;
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} else if (ObDoubleType == base_res_type && ObDoubleType == x_res_type) {
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rt_expr.eval_func_ = calc_log_expr_double;
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} else {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("invalid arg type", K(ret), K(rt_expr));
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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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