340 lines
10 KiB
C++
340 lines
10 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 "sql/engine/expr/ob_expr_neg.h"
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#include "share/object/ob_obj_cast.h"
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#include "share/datum/ob_datum_util.h"
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#include "sql/engine/expr/ob_expr_result_type_util.h"
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#include "sql/session/ob_sql_session_info.h"
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#include "lib/json_type/ob_json_base.h"
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namespace oceanbase
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{
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using namespace common;
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namespace sql
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{
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template<ObObjTypeClass>
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static int eval_neg_func(const ObExpr &expr,
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ObEvalCtx &eval_ctx,
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ObDatum &expr_datum)
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{
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UNUSED(expr);
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UNUSED(eval_ctx);
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UNUSED(expr_datum);
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int ret = OB_ERR_INVALID_TYPE_FOR_OP;
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return ret;
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}
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static int check_expr_and_eval_param(const ObExpr &expr,
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ObEvalCtx &eval_ctx,
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ObDatum *¶m_datum,
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bool &found_null)
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{
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int ret = OB_SUCCESS;
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param_datum = NULL;
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found_null = false;
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if (OB_UNLIKELY(expr.type_ != T_OP_NEG) ||
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OB_ISNULL(expr.args_) ||
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OB_UNLIKELY(expr.arg_cnt_ != 1) ||
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OB_ISNULL(expr.args_[0])) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("invalid argument", K(ret));
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} else if (OB_FAIL(expr.args_[0]->eval(eval_ctx, param_datum))) {
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LOG_WARN("failed to eval", K(ret));
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} else if (param_datum->is_null()) {
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found_null = true;
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} else {
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LOG_DEBUG("succeed to check expr and eval param", K(ret));
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}
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return ret;
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}
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#define DEF_EVAL_NEG_FUNC(obj_tc) \
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template <> \
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int eval_neg_func<obj_tc>(const ObExpr &expr, ObEvalCtx &eval_ctx, \
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ObDatum &expr_datum)
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DEF_EVAL_NEG_FUNC(ObNullTC) {
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int ret = OB_SUCCESS;
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UNUSED(expr);
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UNUSED(eval_ctx);
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expr_datum.set_null();
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return ret;
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}
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DEF_EVAL_NEG_FUNC(ObIntTC) {
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int ret = OB_SUCCESS;
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ObDatum *param = NULL;
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bool found_null = false;
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if (OB_FAIL(check_expr_and_eval_param(expr, eval_ctx, param, found_null))) {
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LOG_WARN("failed to check expr and eval", K(ret));
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} else if (found_null) {
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expr_datum.set_null();
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} else if (param->get_int() == INT64_MIN) {
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// following is compatiable with mysql:
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// 1. select -c1 from t1; will give error if c1 is INT64_MIN
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// 2. select --9223372036854775808 from dual; will return 9223372036854775808;
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// will be handled in eval func of ObNumberTC. see ObExprNeg::calc_param_type(),
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// type of -9223372036854775808 will be decimal.
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ret = OB_OPERATE_OVERFLOW;
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} else {
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expr_datum.set_int(-param->get_int());
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}
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return ret;
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}
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DEF_EVAL_NEG_FUNC(ObUIntTC) {
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int ret = OB_SUCCESS;
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ObDatum *param = NULL;
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bool found_null = false;
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if (OB_FAIL(check_expr_and_eval_param(expr, eval_ctx, param, found_null))) {
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LOG_WARN("failed to check expr and eval", K(ret));
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} else if (found_null) {
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expr_datum.set_null();
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} else {
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if (param->get_uint64() > (1UL + INT64_MAX)) {
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ret = OB_OPERATE_OVERFLOW;
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} else {
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expr_datum.set_int(-param->get_uint64());
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}
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}
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return ret;
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}
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DEF_EVAL_NEG_FUNC(ObFloatTC) {
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int ret = OB_SUCCESS;
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ObDatum *param = NULL;
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bool found_null = false;
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if (OB_FAIL(check_expr_and_eval_param(expr, eval_ctx, param, found_null))) {
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LOG_WARN("failed to check expr and eval", K(ret));
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} else if (found_null) {
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expr_datum.set_null();
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} else {
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expr_datum.set_float(-param->get_float());
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}
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return ret;
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}
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DEF_EVAL_NEG_FUNC(ObDoubleTC) {
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int ret = OB_SUCCESS;
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ObDatum *param = NULL;
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bool found_null = false;
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if (OB_FAIL(check_expr_and_eval_param(expr, eval_ctx, param, found_null))) {
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LOG_WARN("failed to check expr and eval", K(ret));
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} else if (found_null) {
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expr_datum.set_null();
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} else {
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expr_datum.set_double(-param->get_double());
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}
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return ret;
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}
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DEF_EVAL_NEG_FUNC(ObNumberTC) {
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int ret = OB_SUCCESS;
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ObDatum *param = NULL;
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bool found_null = false;
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if (OB_FAIL(check_expr_and_eval_param(expr, eval_ctx, param, found_null))) {
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LOG_WARN("failed to check expr and eval", K(ret));
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} else if (found_null) {
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expr_datum.set_null();
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} else {
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number::ObNumber param_nmb(param->get_number());
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expr_datum.set_number(param_nmb.negate());
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}
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return ret;
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}
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static ObExpr::EvalFunc eval_neg_funcs[ObMaxTC];
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template<int N>
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struct ObEvalNegFuncIniter
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{
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static int init_array()
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{
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eval_neg_funcs[N] = &eval_neg_func<static_cast<ObObjTypeClass>(N)>;
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return 0;
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}
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};
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static bool init_ret = ObArrayConstIniter<ObMaxTC, ObEvalNegFuncIniter>::init();
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static_assert(ObMaxTC == sizeof(eval_neg_funcs) / sizeof(void *), "unexpected size");
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REG_SER_FUNC_ARRAY(OB_SFA_SQL_EXPR_NEG_EVAL, eval_neg_funcs, ARRAYSIZEOF(eval_neg_funcs));
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ObExprNeg::ObExprNeg(ObIAllocator &alloc)
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: ObExprOperator(alloc, T_OP_NEG, N_NEG, 1, NOT_ROW_DIMENSION) {};
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int ObExprNeg::calc_result_type1(ObExprResType &type, ObExprResType &type1, 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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static const int16_t NEG_PRECISION_OFFSET = 1;
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const ObSQLSessionInfo *session = dynamic_cast<const ObSQLSessionInfo *>(type_ctx.get_session());
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if (OB_ISNULL(session)) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("invalid argument", K(ret));
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} else if (OB_LIKELY(NOT_ROW_DIMENSION == row_dimension_)) {
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// result type
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ObObjType itype = ObMaxType;
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if (OB_SUCC(ObExprResultTypeUtil::get_neg_result_type(itype, type1.get_type()))) {
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if (ObMaxType == itype) {
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ret = OB_ERR_INVALID_TYPE_FOR_OP;
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LOG_WARN("unsupported type for neg", K(ret), K(type1), K(itype));
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} else {
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type.set_type(itype);
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}
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}
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if (OB_SUCC(ret)) {
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// collation
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// 结果不可能为字符类型，无需专门设置collation
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// null flag
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ObExprOperator::calc_result_flag1(type, type1);
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if (lib::is_oracle_mode()) {
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type.set_scale(ObAccuracy::DDL_DEFAULT_ACCURACY2[ORACLE_MODE][type.get_type()].
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get_scale());
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type.set_precision(ObAccuracy::DDL_DEFAULT_ACCURACY2[ORACLE_MODE][type.get_type()].
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get_precision());
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} else {
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// scale
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type.set_scale(type1.get_scale());
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if (OB_LIKELY(0 < type1.get_precision())) {
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if (type1.get_type() == ObUNumberType) {
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type.set_precision(static_cast<int16_t>(type1.get_precision()));
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} else {
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type.set_precision(static_cast<int16_t>(type1.get_precision() + NEG_PRECISION_OFFSET));
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}
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}
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}
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ObObjType res_param_type = ObMaxType;
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ObObjType result_type = ObMaxType;
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if (type1.get_type() == ObJsonType) {
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type.set_type(ObDoubleType);
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type1.set_calc_type(ObDoubleType);
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} else if (OB_FAIL(calc_param_type(type1, res_param_type, result_type))) {
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LOG_WARN("failed to calc param type", K(ret));
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} else {
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LOG_DEBUG("calc reuslt type", K(res_param_type), K(result_type));
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type.set_type(result_type);
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type1.set_calc_type(res_param_type);
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}
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}
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} else {
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ret = OB_ERR_INVALID_TYPE_FOR_OP;
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}
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return ret;
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}
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int ObExprNeg::cg_expr(ObExprCGCtx &op_cg_ctx,
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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(op_cg_ctx);
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UNUSED(raw_expr);
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if (OB_UNLIKELY(T_OP_NEG != rt_expr.type_) ||
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OB_ISNULL(rt_expr.args_) ||
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OB_UNLIKELY(rt_expr.arg_cnt_ != 1) ||
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OB_ISNULL(rt_expr.args_[0])) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("invalid argument", K(ret));
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} else {
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ObObjTypeClass param_tc = OBJ_TYPE_TO_CLASS[rt_expr.args_[0]->datum_meta_.type_];
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rt_expr.eval_func_ = eval_neg_funcs[param_tc];
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}
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return ret;
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}
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int ObExprNeg::calc_param_type(const ObExprResType ¶m_type,
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ObObjType &calc_type,
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ObObjType &result_type)
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{
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int ret = OB_SUCCESS;
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switch (OBJ_TYPE_TO_CLASS[param_type.get_type()]) {
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case ObUIntTC:
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case ObBitTC:
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case ObEnumSetTC: {
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calc_type = ObUInt64Type;
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result_type = ObIntType;
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if (ObUInt64Type == param_type.get_type() && param_type.is_literal()) {
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result_type = calc_type = ObNumberType;
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}
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break;
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}
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case ObYearTC:
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case ObIntTC: {
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if (ObIntType == param_type.get_type() && param_type.is_literal()) {
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const ObObj &obj = param_type.get_param();
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if (OB_UNLIKELY(!obj.is_int())) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("unexpected obj type", K(ret), K(obj), K(param_type));
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} else if (INT64_MIN == obj.get_int()) {
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// select --9223372036854775808;
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// -9223372036854775808 is a decimal. otherwise neg will overflow.
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result_type = calc_type = ObNumberType;
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} else {
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result_type = calc_type = ObIntType;
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}
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} else {
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result_type = calc_type = ObIntType;
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}
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break;
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}
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case ObFloatTC: {
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result_type = calc_type = is_oracle_mode() ? ObFloatType : ObDoubleType;
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break;
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}
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case ObDoubleTC: {
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result_type = calc_type = ObDoubleType;
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break;
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}
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case ObNumberTC: {
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result_type = calc_type = ObNumberType;
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break;
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}
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case ObDateTC:
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case ObDateTimeTC:
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case ObTimeTC:
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case ObTextTC:
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case ObStringTC: {
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if (lib::is_oracle_mode()) {
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result_type = calc_type = ObNumberType;
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} else {
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result_type = calc_type = ObDoubleType;
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}
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break;
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}
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case ObExtendTC:
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case ObRawTC: {
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ret = OB_ERR_INVALID_TYPE_FOR_OP;
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break;
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}
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case ObJsonTC: {
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result_type = ObDoubleType;
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calc_type = ObDoubleType;
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break;
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}
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default: {
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result_type = calc_type = ObNullType;
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break;
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}
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}
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return ret;
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}
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} // end namespace sql
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} // end namespace oceanbase
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