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!6692 【mysql兼容性】解决group_concat下标计算为负数的问题

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Merge pull request !6692 from 魏文韬/charset_fix
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opengauss_bot
2024-11-20 02:48:12 +00:00
committed by Gitee
parent 12f82d0a2b de0b4bc1c5
commit 922dcdfa25
1 changed files with 1 additions and 1 deletions
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src/common/backend/utils/adt/varlena.cpp
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@ -6434,7 +6434,7 @@ Datum group_concat_finalfn(PG_FUNCTION_ARGS)
StringInfo state = (StringInfo)PG_GETARG_POINTER(0);
int cur_charset = get_valid_charset_by_collation(PG_GET_COLLATION());
int encoding_max_length = pg_wchar_table[cur_charset].maxmblen;
int real_len = state->len - encoding_max_length;
int real_len = state->len - encoding_max_length > 0 ? state->len - encoding_max_length : 0;
char* real_data = state->data + real_len;
while (real_data != NULL) {
int cur_len = pg_wchar_table[cur_charset].mblen((const unsigned char*)real_data);