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src/sql/engine/expr/ob_expr_oracle_nullif.cpp
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258
src/sql/engine/expr/ob_expr_oracle_nullif.cpp
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/**
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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 "lib/charset/ob_charset.h"
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#include "share/object/ob_obj_cast.h"
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#include "sql/engine/expr/ob_expr_equal.h"
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#include "sql/engine/expr/ob_expr_oracle_nullif.h"
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#include "sql/session/ob_sql_session_info.h"
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namespace oceanbase {
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using namespace oceanbase::common;
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namespace sql {
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ObExprOracleNullif::ObExprOracleNullif(ObIAllocator& alloc) : ObExprNullif(alloc)
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{}
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int ObExprOracleNullif::calc_result_typeN(
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ObExprResType& type, ObExprResType* types, int64_t param_num, ObExprTypeCtx& type_ctx) const
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{
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int ret = OB_SUCCESS;
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const ObSQLSessionInfo* session = type_ctx.get_session();
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CK(OB_NOT_NULL(session));
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CK(2 == param_num);
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if (OB_SUCC(ret)) {
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ObExprResType& type1 = types[0];
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ObExprResType& type2 = types[1];
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if (type1.is_null() || type1.is_lob()) {
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ret = OB_ERR_INVALID_TYPE_FOR_OP;
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LOG_USER_ERROR(OB_ERR_INVALID_TYPE_FOR_OP, "-", ob_obj_type_str(type2.get_type()));
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LOG_WARN("invalid type of parameter", K(ret), K(type1));
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} else if (is_same_type(type1, type2)) {
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if (is_numberic_type(type1.get_oracle_type(), type2.get_oracle_type())) {
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calc_numberic_type(type, type1, type2);
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} else if (ob_is_raw(type1.get_type())) {
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type.set_raw();
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} else {
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ObExprResType cmp_type;
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if (OB_FAIL(calc_cmp_type2(cmp_type, type1, type2, type_ctx.get_coll_type()))) {
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LOG_WARN("failed to calc cmp type", K(ret), K(type1), K(type2));
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} else {
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type.set_type(type1.get_type());
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type.set_accuracy(type1.get_accuracy());
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if (ob_is_string_type(type.get_type())) {
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const ObSQLSessionInfo* session = type_ctx.get_session();
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ObSEArray<ObExprResType*, 2, ObNullAllocator> params;
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CK(OB_NOT_NULL(session));
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OZ(params.push_back(&type1));
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OZ(params.push_back(&type2));
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OZ(aggregate_string_type_and_charset_oracle(*session, params, type));
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OZ(deduce_string_param_calc_type_and_charset(*session, type, params));
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if (OB_SUCC(ret)) {
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// deduce length
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if (type.get_collation_type() == CS_TYPE_BINARY) {
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ObLength len_in_byte = -1;
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if (OB_FAIL(type1.get_length_for_meta_in_bytes(len_in_byte))) {
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LOG_WARN("get length in bytes failed", K(ret), K(type1));
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} else {
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type.set_length(len_in_byte);
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}
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} else {
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type.set_length(type1.get_length());
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}
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}
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}
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type.set_calc_type(cmp_type.get_calc_type());
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type.set_calc_collation(cmp_type);
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}
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}
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} else {
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if (type2.is_null()) {
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if (type1.is_number()) {
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type.set_number();
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type.set_precision(PRECISION_UNKNOWN_YET);
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type.set_scale(ORA_NUMBER_SCALE_UNKNOWN_YET);
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} else {
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type.set_meta(type1.get_obj_meta());
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type.set_accuracy(type1.get_accuracy());
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}
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} else {
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ret = OB_ERR_INVALID_TYPE_FOR_OP;
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LOG_USER_ERROR(
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OB_ERR_INVALID_TYPE_FOR_OP, ob_obj_type_str(type1.get_type()), ob_obj_type_str(type2.get_type()));
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LOG_WARN("diff type of parameters", K(ret), K(type1), K(type2));
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}
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}
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if (OB_SUCC(ret) && session->use_static_typing_engine()) {
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type1.set_calc_meta(type.get_obj_meta());
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type2.set_calc_meta(type.get_obj_meta());
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}
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}
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return ret;
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}
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bool ObExprOracleNullif::is_same_type(const ObExprResType& type1, const ObExprResType& type2) const
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{
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bool ret = false;
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ObObjOType oracleType1 = type1.get_oracle_type();
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ObObjOType oracleType2 = type2.get_oracle_type();
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if (oracleType1 == oracleType2 || is_numberic_type(oracleType1, oracleType2) ||
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is_string_type(oracleType1, oracleType2) || is_time_type(oracleType1, oracleType2)) {
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ret = true;
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}
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return ret;
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}
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bool ObExprOracleNullif::is_numberic_type(const ObObjOType& otype1, const ObObjOType& otype2) const
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{
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bool ret = false;
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if ((otype1 >= ObOSmallIntType && otype1 <= ObONumberType) &&
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(otype2 >= ObOSmallIntType && otype2 <= ObONumberType)) {
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ret = true;
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}
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return ret;
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}
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void ObExprOracleNullif::calc_numberic_type(ObExprResType& type, ObExprResType& type1, ObExprResType& type2) const
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{
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int ret = OB_SUCCESS;
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ObObjOType oracleType1 = type1.get_oracle_type();
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ObObjOType oracleType2 = type2.get_oracle_type();
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ObObjOType result = ObONumberType;
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if (oracleType1 == ObOBinFloatType || oracleType1 == ObOBinDoubleType) {
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result = oracleType1;
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}
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// enum id: binary float(5), binary double(6), number(7)
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if (oracleType2 == ObOBinFloatType || oracleType2 == ObOBinDoubleType) {
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if (result == ObONumberType) {
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result = oracleType2;
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} else {
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result = (result > oracleType2) ? result : oracleType2;
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}
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}
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if (result == ObONumberType) {
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type.set_number();
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type.set_precision(PRECISION_UNKNOWN_YET);
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type.set_scale(ORA_NUMBER_SCALE_UNKNOWN_YET);
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} else if (result == ObOBinFloatType) {
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type.set_float();
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type.set_precision(PRECISION_UNKNOWN_YET);
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type.set_scale(ORA_NUMBER_SCALE_UNKNOWN_YET);
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} else {
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type.set_double();
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type.set_precision(PRECISION_UNKNOWN_YET);
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type.set_scale(ORA_NUMBER_SCALE_UNKNOWN_YET);
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}
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if (OB_SUCC(ret)) {
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type1.set_calc_type(type.get_type());
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type2.set_calc_type(type.get_type());
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}
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}
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bool ObExprOracleNullif::is_string_type(const ObObjOType& otype1, const ObObjOType& otype2) const
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{
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bool ret = false;
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if (((otype1 >= ObOCharType && otype1 <= ObOVarcharType) && (otype2 >= ObOCharType && otype2 <= ObOVarcharType)) ||
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((otype1 >= ObONVarchar2Type && otype1 <= ObONCharType) &&
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(otype2 >= ObONVarchar2Type && otype2 <= ObONCharType))) {
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ret = true;
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}
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return ret;
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}
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bool ObExprOracleNullif::is_time_type(const ObObjOType& otype1, const ObObjOType& otype2) const
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{
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bool ret = false;
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if ((otype1 >= ObODateType && otype1 <= ObOTimestampType) && (otype2 >= ObODateType && otype2 <= ObOTimestampType)) {
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ret = true;
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}
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return ret;
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}
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int ObExprOracleNullif::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(raw_expr);
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CK(2 == rt_expr.arg_cnt_);
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OV(OB_NOT_NULL(
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rt_expr.inner_functions_ = reinterpret_cast<void**>(expr_cg_ctx.allocator_->alloc(sizeof(DatumCmpFunc) * 1))),
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OB_ALLOCATE_MEMORY_FAILED);
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if (OB_SUCC(ret)) {
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DatumCmpFunc cmp_func = NULL;
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const ObDatumMeta& left_meta = rt_expr.args_[0]->datum_meta_;
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const ObDatumMeta& right_meta = rt_expr.args_[1]->datum_meta_;
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const ObCollationType cmp_cs_type = left_meta.cs_type_;
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CK(left_meta.cs_type_ == right_meta.cs_type_);
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CK(OB_NOT_NULL(cmp_func = ObExprCmpFuncsHelper::get_datum_expr_cmp_func(
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left_meta.type_, right_meta.type_, lib::is_oracle_mode(), cmp_cs_type)));
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OX(rt_expr.inner_func_cnt_ = 1);
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OX(rt_expr.inner_functions_[0] = reinterpret_cast<void*>(cmp_func));
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OX(rt_expr.eval_func_ = first_param_can_be_null_ ? eval_nullif : eval_nullif_not_null);
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}
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return ret;
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}
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int ObExprOracleNullif::eval_nullif(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res)
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{
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int ret = OB_SUCCESS;
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ObDatum* l = NULL;
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ObDatum* r = NULL;
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if (OB_FAIL(expr.eval_param_value(ctx, l, r))) {
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LOG_WARN("eval param failed", K(ret));
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} else if (l->is_null()) {
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res.set_null();
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} else if (r->is_null()) {
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// left is not null, right is null, not equal
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res.set_datum(*l);
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} else {
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bool equal = (0 == reinterpret_cast<DatumCmpFunc>(expr.inner_functions_[0])(*l, *r));
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if (equal) {
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res.set_null();
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} else {
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res.set_datum(*l);
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}
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}
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return ret;
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}
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int ObExprOracleNullif::eval_nullif_not_null(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res)
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{
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int ret = OB_SUCCESS;
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ObDatum* l = NULL;
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ObDatum* r = NULL;
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if (OB_FAIL(expr.eval_param_value(ctx, l, r))) {
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LOG_WARN("eval param failed", K(ret));
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} else if (l->is_null()) {
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ObObjType type2 = expr.args_[1]->obj_meta_.get_type();
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ret = OB_ERR_INVALID_TYPE_FOR_OP;
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LOG_USER_ERROR(OB_ERR_INVALID_TYPE_FOR_OP, "-", ob_obj_type_str(type2));
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} else if (r->is_null()) {
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// left is not null, right is null, not equal
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res.set_datum(*l);
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} else {
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bool equal = (0 == reinterpret_cast<DatumCmpFunc>(expr.inner_functions_[0])(*l, *r));
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if (equal) {
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res.set_null();
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} else {
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res.set_datum(*l);
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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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