hcq/MaxScale
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

qc: Do not collect HAVING names

Browse Source 
A HAVING clause can only refer to names that already have been mentioned
or if "SELECT *" is used. Either way, the HAVING names need not be separately
collected.
This commit is contained in:
Johan Wikman
2016-11-05 10:09:03 +02:00
parent 0aaeda0ef1
commit 75509a67d4
2 changed files with 12 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
query_classifier/qc_mysqlembedded/qc_mysqlembedded.cc
View File

@ -2177,12 +2177,16 @@ void qc_get_field_info(GWBUF* buf, const QC_FIELD_INFO** infos, size_t* n_infos)
&lex->current_select->item_list);
}
#if defined(COLLECT_HAVING_AS_WELL)
// A HAVING clause can only refer to fields that already have been
// mentioned. Consequently, they need not be collected.
if (lex->current_select->having)
{
update_field_infos(pi, COLLECT_HAVING,
lex->current_select->having,
&lex->current_select->item_list);
}
#endif
lex->current_select = lex->current_select->next_select_in_list();
}

4
query_classifier/qc_sqlite/qc_sqlite.c
View File

@ -1029,7 +1029,11 @@ static void update_fields_infos_from_select(QC_SQLITE_INFO* info,
if (pSelect->pHaving)
{
info->has_clause = true;
#if defined(COLLECT_HAVING_AS_WELL)
// A HAVING clause can only refer to fields that already have been
// mentioned. Consequently, they need not be collected.
update_fields_infos(info, 0, pSelect->pHaving, QC_TOKEN_MIDDLE, pSelect->pEList);
#endif
}
}