120 lines
3.5 KiB
C++
120 lines
3.5 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_pow.h"
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//#include "sql/engine/expr/ob_expr_promotion_util.h"
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#include "sql/session/ob_sql_session_info.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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ObExprPow::ObExprPow(ObIAllocator &alloc)
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: ObExprOperator(alloc, T_OP_POW, N_POW, 2, VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
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{
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}
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int ObExprPow::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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UNUSED(type_ctx);
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int ret = OB_SUCCESS;
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UNUSED(type2);
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if (!lib::is_mysql_mode()) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("pow is only for mysql mode", K(ret));
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} else if (NOT_ROW_DIMENSION == row_dimension_) {
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if (ObMaxType == type1.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(ObDoubleType);
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type2.set_calc_type(ObDoubleType);
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// pow donot return error code in mysql mode
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// eg: insert into t1 select pow('a', 2);
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type_ctx.set_cast_mode(type_ctx.get_cast_mode() | CM_WARN_ON_FAIL);
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}
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ObExprOperator::calc_result_flag2(type, type1, type2);
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//just keep enumset as origin
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} else {
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ret = OB_ERR_INVALID_TYPE_FOR_OP; // arithmetic not support row
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}
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return ret;
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}
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int ObExprPow::safe_set_double(ObObj &result, double value)
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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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(isinfl(value) || isnan(static_cast<float>(value)))) {
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ret = OB_OPERATE_OVERFLOW;
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} else {
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result.set_double(value);
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}
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return ret;
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}
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int ObExprPow::safe_set_double(ObDatum &datum, double value)
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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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(isinfl(value) || isnan(static_cast<float>(value)))) {
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ret = OB_OPERATE_OVERFLOW;
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} else {
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datum.set_double(value);
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}
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return ret;
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}
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int ObExprPow::calc_pow_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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// pow(base, exp)
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ObDatum *base = NULL;
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ObDatum *exp = NULL;
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// 验证了下第一个参数是NULL时，MySQL依然会计算第二个参数
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int ret_base = expr.args_[0]->eval(ctx, base);
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int ret_exp = expr.args_[1]->eval(ctx, exp);
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if (OB_SUCCESS == ret_base && OB_SUCCESS == ret_exp) {
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if (base->is_null() || exp->is_null()) {
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res_datum.set_null();
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} else {
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ret = ObExprPow::safe_set_double(res_datum,
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std::pow(base->get_double(), exp->get_double()));
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}
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} else {
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ret = (OB_SUCCESS == ret_base) ? ret_exp : ret_base;
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}
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return ret;
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}
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int ObExprPow::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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CK (2 == raw_expr.get_param_count());
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OX (rt_expr.eval_func_ = calc_pow_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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