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src/sql/engine/expr/ob_expr_instrb.cpp
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259
src/sql/engine/expr/ob_expr_instrb.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 "sql/engine/expr/ob_expr_instrb.h"
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#include "sql/engine/expr/ob_expr_instr.h"
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#include "sql/engine/expr/ob_expr_util.h"
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#include "lib/oblog/ob_log.h"
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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/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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ObExprInstrb::ObExprInstrb(ObIAllocator& alloc)
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: ObLocationExprOperator(alloc, T_FUN_SYS_INSTRB, N_INSTRB, MORE_THAN_ONE, NOT_ROW_DIMENSION)
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{}
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ObExprInstrb::~ObExprInstrb()
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{}
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int ObExprInstrb::calc_result_type2(
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ObExprResType& type, ObExprResType& type1, ObExprResType& type2, common::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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if (OB_ISNULL(session)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("session is NULL", K(ret));
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} else {
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ObExprOperator::calc_result_flag2(type, type1, type2);
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type.set_number();
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type.set_precision(PRECISION_UNKNOWN_YET);
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type.set_scale(NUMBER_SCALE_UNKNOWN_YET);
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ObSEArray<ObExprResType*, 2, ObNullAllocator> params;
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OZ(params.push_back(&type1));
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ObExprResType tmp_type;
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OZ(aggregate_string_type_and_charset_oracle(*session, params, tmp_type));
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OZ(params.push_back(&type2));
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OZ(deduce_string_param_calc_type_and_charset(*session, tmp_type, params));
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}
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return ret;
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}
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int ObExprInstrb::calc_result_typeN(
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ObExprResType& type, ObExprResType* type_array, int64_t param_num, ObExprTypeCtx& type_ctx) const
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{
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int ret = OB_SUCCESS;
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if (OB_UNLIKELY(param_num < 2 || param_num > 4)) {
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ret = OB_ERR_PARAM_SIZE;
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LOG_WARN("param num is invalid", K(ret), K(param_num));
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} else if (OB_ISNULL(type_array)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("type array is null", K(ret));
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} else if (OB_FAIL(calc_result_type2(type, type_array[0], type_array[1], type_ctx))) {
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LOG_WARN("fail calc result type", K(param_num), K(ret));
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} else {
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if (3 == param_num) {
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type_array[2].set_calc_type(ObNumberType); // position
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} else if (4 == param_num) {
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type_array[2].set_calc_type(ObNumberType); // position
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type_array[3].set_calc_type(ObNumberType); // occurrence
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}
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}
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return ret;
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}
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int ObExprInstrb::calc_resultN(
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ObObj& result, const common::ObObj* param_array, int64_t param_num, common::ObExprCtx& expr_ctx) const
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{
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int ret = OB_SUCCESS;
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if (OB_ISNULL(param_array)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("param_array is null", K(ret));
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} else if (OB_UNLIKELY(param_num < 2 || param_num > 4)) {
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ret = OB_ERR_PARAM_SIZE;
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LOG_WARN("invalid param count", K(param_num), K(ret));
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} else if (param_array[0].is_null() || param_array[1].is_null()) {
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result.set_null();
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} else if (param_array[0].is_clob() && (0 == param_array[0].get_string().length())) {
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result.set_lob_value(ObLongTextType, param_array[0].get_string().ptr(), param_array[0].get_string().length());
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result.set_meta_type(result_type_);
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} else if (2 == param_num) {
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ObObj position(static_cast<int64_t>(1));
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ObObj occurrence(static_cast<int64_t>(1));
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ret = calc(result, param_array[0], param_array[1], position, occurrence, expr_ctx);
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} else if (3 == param_num) {
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ObObj occurrence(static_cast<int64_t>(1));
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ret = calc(result, param_array[0], param_array[1], param_array[2], occurrence, expr_ctx);
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} else {
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ret = calc(result, param_array[0], param_array[1], param_array[2], param_array[3], expr_ctx);
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}
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return ret;
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}
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int ObExprInstrb::calc(ObObj& result, const ObObj& haystack, const ObObj& needle, const ObObj& position,
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const ObObj& occurrence, ObExprCtx& expr_ctx) const
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{
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int ret = OB_SUCCESS;
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int64_t pos_val = -1;
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int64_t occ_val = -1;
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int64_t ret_idx = -1;
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number::ObNumber ret_num;
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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("expr_ctx.calc_buf_ is null", K(ret));
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} else if (OB_UNLIKELY(haystack.is_null_oracle() || needle.is_null_oracle() || position.is_null_oracle() ||
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occurrence.is_null_oracle())) {
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result.set_null();
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} else if (OB_UNLIKELY(!is_type_valid(haystack.get_type()) || !is_type_valid(needle.get_type()) ||
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!is_type_valid(position.get_type()) || !is_type_valid(occurrence.get_type()))) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("param is not castable", K(haystack), K(needle), K(position), K(occurrence), K(ret));
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} else if (OB_FAIL(ObExprUtil::get_trunc_int64(position, expr_ctx, pos_val))) {
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LOG_WARN("get position failed", K(position), K(ret));
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} else if (OB_FAIL(ObExprUtil::get_trunc_int64(occurrence, expr_ctx, occ_val))) {
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LOG_WARN("get occurrence failed", K(occurrence), K(ret));
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} else if (OB_UNLIKELY(0 >= occ_val)) {
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ret = OB_ERR_ARGUMENT_OUT_OF_RANGE;
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LOG_USER_ERROR(OB_ERR_ARGUMENT_OUT_OF_RANGE, occ_val);
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} else if (OB_UNLIKELY(0 == pos_val)) {
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ret_num.set_zero();
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result.set_number(ret_num);
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} else {
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const ObString& haystack_str = haystack.get_string();
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const ObString& needle_str = needle.get_string();
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if (OB_SUCC(ret)) {
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if (OB_FAIL(search(haystack_str, needle_str, pos_val, occ_val, ret_idx))) {
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LOG_WARN("search needle in haystack failed", K(ret), K(haystack_str), K(needle_str));
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} else if (OB_FAIL(ret_num.from(ret_idx, *(expr_ctx.calc_buf_)))) {
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LOG_WARN("int64_t to ObNumber failed", K(ret), K(ret_idx));
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} else {
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result.set_number(ret_num);
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}
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}
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}
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return ret;
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}
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int ObExprInstrb::search(const ObString& haystack, const ObString& needle, int64_t start, int64_t occ, int64_t& ret_idx)
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{
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int ret = OB_SUCCESS;
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if (OB_ISNULL(haystack.ptr())) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("ptr is null", K(haystack));
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} else if (OB_ISNULL(needle.ptr())) {
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ret = OB_CLOB_ONLY_SUPPORT_WITH_MULTIBYTE_FUN;
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LOG_WARN("ptr is null", K(needle));
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} else if (haystack.length() < needle.length()) {
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ret_idx = 0;
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} else {
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if (0 < start) {
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start = start - 1;
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if (start > haystack.length() || start + needle.length() > haystack.length()) {
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ret_idx = 0;
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} else if (OB_FAIL(ObExprUtil::kmp(
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needle.ptr(), needle.length(), haystack.ptr() + start, haystack.length() - start, occ, ret_idx))) {
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LOG_WARN("ObExprInstrb kmp failed", K(occ), K(start), K(needle), K(haystack));
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} else if (-1 < ret_idx) {
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ret_idx = ret_idx + 1 + start;
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} else {
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ret_idx = 0;
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}
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} else { // start < 0
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occ = -occ;
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int64_t compare_len = min(haystack.length(), haystack.length() + start + needle.length());
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if ((-start) > haystack.length()) {
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ret_idx = 0;
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} else {
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if (OB_FAIL(
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ObExprUtil::kmp_reverse(needle.ptr(), needle.length(), haystack.ptr(), compare_len, occ, ret_idx))) {
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LOG_WARN("ObExprInstrb kmp_reverse failed", K(occ), K(compare_len), K(needle), K(haystack));
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} else if (-1 < ret_idx) {
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ret_idx = ret_idx + 1;
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} else {
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ret_idx = 0;
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}
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}
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}
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}
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return ret;
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}
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int calc_instrb_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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bool is_null = false;
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ObDatum* haystack = NULL;
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ObDatum* needle = NULL;
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int64_t pos_int = 0;
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int64_t occ_int = 0;
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number::ObNumber res_nmb;
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ObCollationType calc_cs_type = CS_TYPE_INVALID;
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if (OB_FAIL(ObExprOracleInstr::calc_oracle_instr_arg(
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expr, ctx, is_null, haystack, needle, pos_int, occ_int, calc_cs_type))) {
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LOG_WARN("calc_instrb_arg failed", K(ret));
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} else if (is_null) {
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res_datum.set_null();
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} else if (0 == haystack->get_string().length()) {
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number::ObNumber res_nmb;
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ObNumStackOnceAlloc tmp_alloc;
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if (OB_FAIL(res_nmb.from((uint64_t)(0), tmp_alloc))) {
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LOG_WARN("get number from int failed", K(ret));
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} else {
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res_datum.set_number(res_nmb);
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}
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} else if (OB_ISNULL(haystack) || OB_ISNULL(needle)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("haystack or needle is NULL", K(ret), KP(haystack), KP(needle));
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} else if (0 >= occ_int) {
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ret = OB_ERR_ARGUMENT_OUT_OF_RANGE;
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LOG_USER_ERROR(OB_ERR_ARGUMENT_OUT_OF_RANGE, occ_int);
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} else if (OB_UNLIKELY(0 == pos_int)) {
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res_nmb.set_zero();
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res_datum.set_number(res_nmb);
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} else {
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const ObString& haystack_str = haystack->get_string();
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const ObString& needle_str = needle->get_string();
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int64_t ret_idx = -1;
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if (OB_SUCC(ret)) {
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ObNumStackOnceAlloc tmp_alloc;
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if (OB_FAIL(ObExprInstrb::search(haystack_str, needle_str, pos_int, occ_int, ret_idx))) {
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LOG_WARN("search needle in haystack failed", K(ret), K(haystack_str), K(needle_str));
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} else if (OB_FAIL(res_nmb.from(ret_idx, tmp_alloc))) {
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LOG_WARN("int64_t to ObNumber failed", K(ret), K(ret_idx));
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} else {
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res_datum.set_number(res_nmb);
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}
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}
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}
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return ret;
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}
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int ObExprInstrb::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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rt_expr.eval_func_ = calc_instrb_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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