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2021-05-31 22:56:52 +08:00
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src/sql/engine/expr/ob_expr_atan2.cpp Normal file
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/**
* Copyright (c) 2021 OceanBase
* OceanBase CE is licensed under Mulan PubL v2.
* You can use this software according to the terms and conditions of the Mulan PubL v2.
* You may obtain a copy of Mulan PubL v2 at:
* http://license.coscl.org.cn/MulanPubL-2.0
* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
* See the Mulan PubL v2 for more details.
*/
#define USING_LOG_PREFIX SQL_ENG
#include "ob_expr_atan2.h"
#include "sql/engine/expr/ob_expr_util.h"
#include "share/object/ob_obj_cast.h"
#include "sql/parser/ob_item_type.h"
//#include "sql/engine/expr/ob_expr_promotion_util.h"
#include "sql/session/ob_sql_session_info.h"
#include <math.h>
using namespace oceanbase::common;
using namespace oceanbase::sql;
namespace oceanbase {
namespace sql {
ObExprAtan2::ObExprAtan2(ObIAllocator& alloc)
: ObFuncExprOperator(alloc, T_FUN_SYS_ATAN2, N_ATAN2, ONE_OR_TWO, NOT_ROW_DIMENSION)
{}
ObExprAtan2::~ObExprAtan2()
{}
int ObExprAtan2::calc_result_typeN(
ObExprResType& type, ObExprResType* types, int64_t type_num, common::ObExprTypeCtx& type_ctx) const
{
int ret = OB_SUCCESS;
if (share::is_oracle_mode() && OB_UNLIKELY(NULL == types || type_num != 2)) {
ret = OB_ERR_PARAM_SIZE;
LOG_WARN("Invalid argument.", K(ret), K(types), K(type_num));
} else if (share::is_mysql_mode() && OB_UNLIKELY(NULL == types || type_num <= 0 || type_num > 2)) {
ret = OB_ERR_PARAM_SIZE;
LOG_WARN("Invalid argument.", K(ret), K(types), K(type_num));
} else {
if (1 == type_num) {
ret = calc_trig_function_result_type1(type, types[0], type_ctx);
} else {
ret = calc_trig_function_result_type2(type, types[0], types[1], type_ctx);
}
}
return ret;
}
int ObExprAtan2::calc_resultN(
common::ObObj& result, const common::ObObj* objs, int64_t param_num, common::ObExprCtx& expr_ctx) const
{
int ret = OB_SUCCESS;
if (share::is_oracle_mode() && OB_UNLIKELY(NULL == objs || param_num != 2)) {
ret = OB_ERR_PARAM_SIZE;
LOG_WARN("Invalid argument.", K(ret), K(objs), K(param_num));
} else if (share::is_mysql_mode() && OB_UNLIKELY(NULL == objs || param_num <= 0 || param_num > 2)) {
ret = OB_ERR_PARAM_SIZE;
LOG_WARN("Invalid argument.", K(ret), K(objs), K(param_num));
} else if (OB_UNLIKELY(OB_ISNULL(expr_ctx.calc_buf_))) {
ret = OB_NOT_INIT;
LOG_WARN("varchar buffer not init", K(ret));
} else {
if (1 == param_num) {
// only mysql mode
if (OB_UNLIKELY(objs[0].is_null())) {
result.set_null();
} else if (objs[0].is_double()) {
double arg = objs[0].get_double();
double res = atan(arg);
result.set_double(res);
}
} else if (2 == param_num) {
const ObObj& obj1 = objs[0];
const ObObj& obj2 = objs[1];
if (OB_UNLIKELY(ObNullType == obj1.get_type() || ObNullType == obj2.get_type())) {
result.set_null();
} else if (OB_UNLIKELY(obj1.is_zero() && obj2.is_zero())) {
ret = OB_NUMERIC_OVERFLOW;
LOG_WARN("fail to calc atan2(0,0)", K(ret));
} else if (obj1.is_number() && obj2.is_number()) {
number::ObNumber res_nmb;
if (OB_FAIL(obj1.get_number().atan2(obj2.get_number(), res_nmb, *(expr_ctx.calc_buf_)))) {
LOG_WARN("fail to calc atan2", K(ret));
} else {
result.set_number(res_nmb);
}
} else if (obj1.is_double() && obj2.is_double()) {
double arg1 = obj1.get_double();
double arg2 = obj2.get_double();
double res = atan2(arg1, arg2);
result.set_double(res);
}
}
}
return ret;
}
int calc_atan2_expr(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum)
{
int ret = OB_SUCCESS;
if (1 == expr.arg_cnt_) {
// only mysql mode
ObDatum* radian = NULL;
if (OB_FAIL(expr.args_[0]->eval(ctx, radian))) {
LOG_WARN("eval radian arg failed", K(ret), K(expr));
} else if (radian->is_null()) {
res_datum.set_null();
} else if (ObDoubleType == expr.args_[0]->datum_meta_.type_) {
const double arg = radian->get_double();
res_datum.set_double(atan(arg));
}
} else { // 2 == expr.arg_cnt_
// calc atan2(y/x)
ObExpr* arg0 = expr.args_[0];
ObExpr* arg1 = expr.args_[1];
ObDatum* y = NULL;
ObDatum* x = NULL;
if (OB_FAIL(arg0->eval(ctx, y)) || OB_FAIL(arg1->eval(ctx, x))) {
LOG_WARN("eval arg failed", K(ret), K(expr), KP(y), KP(x));
} else if (y->is_null() || x->is_null()) {
/* arg is already be cast to number type, no need to is_null_oracle */
res_datum.set_null();
} else if (ObNumberType == arg0->datum_meta_.type_ && ObNumberType == arg1->datum_meta_.type_) {
number::ObNumber y_nmb(y->get_number());
number::ObNumber x_nmb(x->get_number());
if (y_nmb.is_zero() && x_nmb.is_zero()) {
ret = OB_NUMERIC_OVERFLOW;
LOG_WARN("calc atan2(0,0) failed", K(ret));
} else {
number::ObNumber res_nmb;
if (OB_FAIL(y_nmb.atan2(x_nmb, res_nmb, ctx.get_reset_tmp_alloc()))) {
LOG_WARN("calc atan2 failed", K(ret), K(y_nmb), K(x_nmb), K(expr));
} else {
res_datum.set_number(res_nmb);
}
}
} else if (ObDoubleType == arg0->datum_meta_.type_ && ObDoubleType == arg1->datum_meta_.type_) {
res_datum.set_double(atan2(y->get_double(), x->get_double()));
} else {
ret = OB_ERR_UNEXPECTED;
}
}
return ret;
}
int ObExprAtan2::cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
{
int ret = OB_SUCCESS;
UNUSED(expr_cg_ctx);
UNUSED(raw_expr);
if (share::is_oracle_mode() && OB_UNLIKELY(2 != rt_expr.arg_cnt_)) {
ret = OB_ERR_PARAM_SIZE;
LOG_WARN("invalid arg cnt of expr", K(ret), K(rt_expr));
} else if (share::is_mysql_mode() && OB_UNLIKELY(1 != rt_expr.arg_cnt_ && 2 != rt_expr.arg_cnt_)) {
ret = OB_ERR_PARAM_SIZE;
LOG_WARN("invalid arg cnt of expr", K(ret), K(rt_expr));
} else {
rt_expr.eval_func_ = calc_atan2_expr;
}
return ret;
}
} // namespace sql
} // namespace oceanbase