104 lines
3.0 KiB
C++
104 lines
3.0 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 "ob_expr_log2.h"
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#include <cmath>
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#include "share/object/ob_obj_cast.h"
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#include "sql/parser/ob_item_type.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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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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ObExprLog2::ObExprLog2(ObIAllocator& alloc) : ObFuncExprOperator(alloc, T_FUN_SYS_LOG_TWO, N_LOG2, 1, NOT_ROW_DIMENSION)
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{}
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ObExprLog2::~ObExprLog2()
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{}
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int ObExprLog2::calc_result_type1(ObExprResType& type, ObExprResType& type1, common::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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if (NOT_ROW_DIMENSION != row_dimension_ || 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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ObExprOperator::calc_result_flag1(type, type1);
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}
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return ret;
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}
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int ObExprLog2::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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double val = 0.0;
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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 (obj.is_null()) {
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result.set_null();
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} else if (OB_FAIL(obj.get_double(val))) {
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LOG_WARN("get_double from obj failed", K(ret), K(obj), K(val));
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} else {
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if (val <= 0) {
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LOG_USER_WARN(OB_EER_INVALID_ARGUMENT_FOR_LOGARITHM);
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result.set_null();
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} else {
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result.set_double(std::log(val) / std::log(2));
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}
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}
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return ret;
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}
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int calc_log2_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 = 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 val = arg->get_double();
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if (val <= 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 {
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res_datum.set_double(std::log(val) / std::log(2));
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}
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}
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return ret;
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}
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int ObExprLog2::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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if (OB_UNLIKELY(1 != rt_expr.arg_cnt_) || (ObDoubleType != rt_expr.args_[0]->datum_meta_.type_)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("invalid arg_cnt_ or arg res type is invalid", K(ret), K(rt_expr));
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} else {
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rt_expr.eval_func_ = calc_log2_expr;
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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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