110 lines
3.1 KiB
C++
110 lines
3.1 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_exp.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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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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ObExprExp::ObExprExp(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_EXP, N_EXP, 1, VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
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{
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}
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ObExprExp::~ObExprExp()
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{
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}
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int ObExprExp::calc_result_type1(ObExprResType &type,
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ObExprResType &type1,
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common::ObExprTypeCtx &type_ctx) const
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{
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return calc_trig_function_result_type1(type, type1, type_ctx);
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}
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int calc_exp_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 *arg = NULL;
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if (OB_FAIL(expr.args_[0]->eval(ctx, arg))) {
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LOG_WARN("eval arg failed", K(ret), K(expr));
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} else if (arg->is_null()) {
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res_datum.set_null();
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} else {
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double value = arg->get_double();
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value = std::exp(value);
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if (isinf(value) || isnan(value)) {
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ret = OB_OPERATE_OVERFLOW;
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} else {
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res_datum.set_double(value);
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}
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}
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return ret;
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}
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int calc_exp_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 *arg = NULL;
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if (OB_FAIL(expr.args_[0]->eval(ctx, arg))) {
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LOG_WARN("eval arg failed", K(ret), K(expr));
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} else if (arg->is_null()) {
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res_datum.set_null();
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} else {
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number::ObNumber arg_nmb(arg->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(arg_nmb.e_power(res_nmb, alloc_guard.get_allocator()))) {
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LOG_WARN("e_power failed", K(ret));
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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 ObExprExp::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(1 != rt_expr.arg_cnt_)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("invalid arg_cnt_ of expr", K(ret), K(rt_expr));
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} else {
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ObObjType arg_res_type = rt_expr.args_[0]->datum_meta_.type_;
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if (ObDoubleType == arg_res_type) {
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rt_expr.eval_func_ = calc_exp_expr_double;
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} else if (ObNumberType == arg_res_type) {
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rt_expr.eval_func_ = calc_exp_expr_number;
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} else {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("arg type must be double or number", K(ret), K(arg_res_type));
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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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