1 package DBIx::Class::Storage::DBI::AmbiguousGlob;
6 use base 'DBIx::Class::Storage::DBI';
11 DBIx::Class::Storage::DBI::AmbiguousGlob - Storage component for RDBMS choking on count(*)
15 Some servers choke on things like:
17 COUNT(*) FROM (SELECT tab1.col, tab2.col FROM tab1 JOIN tab2 ... )
19 claiming that col is a duplicate column (it loses the table specifiers by
20 the time it gets to the *). Thus for any subquery count we select only the
21 primary keys of the main table in the inner query. This hopefully still
22 hits the indexes and keeps the server happy.
24 At this point the only overriden method is C<_subq_count_select()>
28 sub _subq_count_select {
29 my ($self, $source, $rs_attrs) = @_;
30 my @pcols = map { join '.', $rs_attrs->{alias}, $_ } ($source->primary_columns);
31 return @pcols ? \@pcols : [ 1 ];
36 See L<DBIx::Class/CONTRIBUTORS>
40 You may distribute this code under the same terms as Perl itself.