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| -rw-r--r-- | Bugzilla/Search.pm | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Bugzilla/Search.pm b/Bugzilla/Search.pm index 1c008bdfb..75a0fbdb4 100644 --- a/Bugzilla/Search.pm +++ b/Bugzilla/Search.pm @@ -2053,6 +2053,13 @@ sub _quote_unless_numeric { sub build_subselect { my ($outer, $inner, $table, $cond, $negate) = @_; + if ($table =~ /\battach_data\b/) { + # It takes a long time to scan the whole attach_data table + # unconditionally, so we return the subselect and let the DB optimizer + # restrict the search based on other search criteria. + my $not = $negate ? "NOT" : ""; + return "$outer $not IN (SELECT DISTINCT $inner FROM $table WHERE $cond)"; + } # Execute subselects immediately to avoid dependent subqueries, which are # large performance hits on MySql my $q = "SELECT DISTINCT $inner FROM $table WHERE $cond"; |