Merge badness

[dbsrgits/DBIx-Class.git] / lib / DBIx / Class / Storage / DBI / AmbiguousGlob.pm

package DBIx::Class::Storage::DBI::AmbiguousGlob;\r
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use strict;\r
use warnings;\r
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use base 'DBIx::Class::Storage::DBI';\r
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=head1 NAME\r
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DBIx::Class::Storage::DBI::AmbiguousGlob - Storage component for RDBMS supporting multicolumn in clauses\r
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=head1 DESCRIPTION\r
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Some servers choke on things like:\r
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  COUNT(*) FROM (SELECT tab1.col, tab2.col FROM tab1 JOIN tab2 ... )\r
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claiming that col is a duplicate column (it loses the table specifiers by\r
the time it gets to the *). Thus for any subquery count we select only the\r
primary keys of the main table in the inner query. This hopefully still\r
hits the indexes and keeps the server happy.\r
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At this point the only overriden method is C<_grouped_count_select()>\r
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=cut\r
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sub _grouped_count_select {\r
  my ($self, $source, $rs_args) = @_;\r
  my @pcols = map { join '.', $rs_args->{alias}, $_ } ($source->primary_columns);\r
  return @pcols ? \@pcols : $rs_args->{group_by};\r
}\r
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=head1 AUTHORS\r
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See L<DBIx::Class/CONTRIBUTORS>\r
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=head1 LICENSE\r
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You may distribute this code under the same terms as Perl itself.\r
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=cut\r
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1;\r