237 lines
7.8 KiB
C++
237 lines
7.8 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_concat_ws.h"
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#include <string.h>
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#include "sql/engine/expr/ob_expr_add.h"
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#include "lib/oblog/ob_log.h"
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#include "objit/common/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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{
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namespace sql
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{
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ObExprConcatWs::ObExprConcatWs(ObIAllocator &alloc)
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:ObStringExprOperator(alloc, T_FUN_CNN_WS, N_CONCAT_WS, PARAM_NUM_UNKNOWN, VALID_FOR_GENERATED_COL)
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{
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need_charset_convert_ = false;
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}
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ObExprConcatWs::~ObExprConcatWs() {}
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int ObExprConcatWs::calc_result_typeN(ObExprResType &type,
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ObExprResType *types,
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int64_t param_num,
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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 (!is_mysql_mode()) {
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ret = OB_ERR_FUNCTION_UNKNOWN;
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LOG_WARN("concat_ws only support on mysql mode", K(ret));
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} else if (param_num <= 1) {
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ret = OB_INVALID_ARGUMENT;
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OB_LOG(WARN, "invalid argument number, param should not less than 1", K(ret), K(param_num));
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} else {
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ObLength len = 0;
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for (int64_t i = 1; i < param_num; ++i) {
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len += types[i].get_length();
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types[i].set_calc_type(ObVarcharType);
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}
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len += static_cast<ObLength>(types[0].get_length() * (param_num - 1));
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types[0].set_calc_type(ObVarcharType);
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type.set_length(len);
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type.set_varchar();
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if (OB_FAIL(aggregate_charsets_for_string_result(type, types, param_num, type_ctx.get_coll_type()))) {
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LOG_WARN("aggregate_charsets_for_string_result failed", K(ret));
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} else {
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for (int64_t i = 0; i < param_num; i++) {
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types[i].set_calc_collation_type(type.get_collation_type());
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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 ObExprConcatWs::concat_ws(const ObString obj1,//separator
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const ObString obj2,//next string to connect
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const int64_t buf_len,
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char **buf,
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int64_t &buf_pos)// writing position of buf now
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{
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int ret = OB_SUCCESS;
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int32_t len1 = obj1.length();
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int32_t len2 = obj2.length();
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if (buf_pos + len1 > buf_len) {
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ret = OB_SIZE_OVERFLOW;
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LOG_WARN("extend length limit.", K(ret), K(buf_pos), K(len1));
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} else {
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MEMCPY(*buf + buf_pos, obj1.ptr(), len1);//separator
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buf_pos += len1;
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}
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if (OB_SUCC(ret)) {
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if (buf_pos + len2 > buf_len) {
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ret = OB_SIZE_OVERFLOW;
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LOG_WARN("extend length limit.", K(ret), K(buf_pos), K(len2));
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} else {
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MEMCPY(*buf + buf_pos, obj2.ptr(), len2);//next string to connect
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buf_pos += len2;
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}
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}
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return ret;
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}
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// for engine 3.0
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// make sure alloc.alloc() is called only once
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int ObExprConcatWs::calc(const ObString &sep_str, const ObIArray<ObString> &words,
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ObIAllocator &alloc, ObString &res_str)
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{
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int ret = OB_SUCCESS;
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res_str.reset();
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int64_t tmp_alloc_len = 0;
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int64_t alloc_len = 0;
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if (OB_UNLIKELY(0 >= words.count())) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("invalid num of words", K(ret), K(words.count()));
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}
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// calc total len of all words
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for (int64_t i = 0; OB_SUCC(ret) && i < words.count(); ++i) {
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const ObString &word = words.at(i);
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tmp_alloc_len = alloc_len + word.length();
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if (ObExprAdd::is_int_int_out_of_range(alloc_len, word.length(), tmp_alloc_len)) {
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ret = OB_OPERATE_OVERFLOW;
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LOG_WARN("add is overflow.", K(ret), K(word.length()), K(alloc_len));
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} else {
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alloc_len = tmp_alloc_len;
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}
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}
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if (OB_SUCC(ret)) {
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// calc total len with sep_str
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if (is_multi_overflow64(words.count()-1, sep_str.length())) {
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ret = OB_OPERATE_OVERFLOW;
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LOG_WARN("string is too long for concat ws", K(ret), K(sep_str.length()), K(words.count()-1));
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} else {
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int64_t all_sep_str_len = (words.count()-1) * sep_str.length();
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tmp_alloc_len += all_sep_str_len;
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if (ObExprAdd::is_int_int_out_of_range(alloc_len, all_sep_str_len, tmp_alloc_len)) {
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ret = OB_OPERATE_OVERFLOW;
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LOG_WARN("string is too long for concat ws", K(ret), K(alloc_len), K(all_sep_str_len));
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} else {
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alloc_len = tmp_alloc_len;
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}
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}
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if (OB_FAIL(ret)) {
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} else if (alloc_len > OB_MAX_VARCHAR_LENGTH) {
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ret = OB_SIZE_OVERFLOW;
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LOG_WARN("extend len limit", K(ret), K(alloc_len));
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} else if (0 == alloc_len) {
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res_str.reset();
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} else if (alloc_len < 0) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("alloc_len is less than zero", K(ret), K(alloc_len));
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} else if (1 == words.count()) {
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res_str = words.at(0);
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} else if (1 < words.count()) {
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char *res_buf = NULL;
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const ObString &word = words.at(0);
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if (OB_ISNULL(res_buf = reinterpret_cast<char*>(alloc.alloc(alloc_len)))) {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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LOG_WARN("alloc mem failed", K(ret), K(alloc_len));
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} else if (word.length() > alloc_len) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("unexpected alloc_len", K(ret), K(word), K(alloc_len));
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} else {
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MEMCPY(res_buf, word.ptr(), word.length());
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int64_t buf_pos = word.length();
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for (int64_t i = 1; OB_SUCC(ret) && i < words.count(); ++i) {
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const ObString &word = words.at(i);
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if (OB_FAIL(concat_ws(sep_str, word, alloc_len, &res_buf, buf_pos))) {
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LOG_WARN("concat ws failed", K(ret), K(sep_str), K(word), K(i));
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}
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}
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if (OB_SUCC(ret)) {
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if (buf_pos > OB_MAX_VARCHAR_LENGTH) {
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ret = OB_SIZE_OVERFLOW;
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LOG_WARN("extend len limit", K(ret), K(alloc_len));
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} else {
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res_str.assign_ptr(res_buf, buf_pos);
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}
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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 ObExprConcatWs::calc_concat_ws_expr(const ObExpr &expr, ObEvalCtx &ctx,
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ObDatum &res)
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{
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int ret = OB_SUCCESS;
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ObDatum *sep = NULL;
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if (OB_UNLIKELY(1 >= expr.arg_cnt_)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("invalid arg cnt", K(ret), K(expr.arg_cnt_));
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} else if (OB_FAIL(expr.eval_param_value(ctx, sep))) {
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LOG_WARN("eval param failed", K(ret));
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} else if (sep->is_null()) {
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res.set_null();
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} else {
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ObSEArray<ObString, 32> words;
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for (int64_t i = 1; OB_SUCC(ret) && i < expr.arg_cnt_; ++i) {
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const ObDatum &dat = expr.locate_param_datum(ctx, i);
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if (!dat.is_null() && OB_FAIL(words.push_back(dat.get_string()))) {
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LOG_WARN("push back string failed", K(ret), K(i));
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}
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}
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if (OB_SUCC(ret)) {
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ObString res_str;
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if (0 == words.count()) {
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res.set_string(res_str);
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} else {
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const ObString &sep_str = expr.locate_param_datum(ctx, 0).get_string();
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ObExprStrResAlloc res_alloc(expr, ctx);
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if (OB_FAIL(calc(sep_str, words, res_alloc, res_str))) {
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LOG_WARN("calc concat ws failed", K(ret));
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} else {
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res.set_string(res_str);
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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 ObExprConcatWs::cg_expr(ObExprCGCtx &expr_cg_ctx, 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(expr_cg_ctx);
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UNUSED(raw_expr);
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rt_expr.eval_func_ = calc_concat_ws_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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