1 package Data::Query::Renderer::SQL::Slice::GenericSubquery;
3 use Data::Query::ExprHelpers;
6 with 'Data::Query::Renderer::SQL::Slice::SubqueryRemap';
10 die "Slice's inner is not a Select"
11 unless is_Select my $orig_select = $dq->{from};
12 my %remapped = $self->_subquery_remap($orig_select);
13 my $first_from = $remapped{inner_body};
14 $first_from = $first_from->{from} if is_Where($first_from);
15 while (is_Join $first_from) {
16 $first_from = $first_from->{left};
18 $first_from = $first_from->{from} if is_Alias($first_from);
19 my $first_order = $remapped{inside_order}[0]{by};
20 my $count_col = $first_order->{elements}[-1];
21 my $count_alias = 'rownum__emulation';
22 my $count_sel = Select(
23 [ Operator({ 'SQL.Naive' => 'apply' }, [ Identifier('COUNT'), Identifier('*') ]) ],
26 { 'SQL.Naive' => ($remapped{inside_order}[0]{reverse} ? '>' : '<') },
28 Identifier($count_alias, $count_col),
29 $remapped{outside_order}[0]{by}
32 Alias($count_alias, $first_from)
35 my $count_where = Operator(
36 { 'SQL.Naive' => ($dq->{offset} ? 'BETWEEN' : '<') },
43 value => $dq->{limit}{value}+$dq->{offset}{value}-1
52 $remapped{outside_select_list},
53 (compose { no warnings 'once'; Order($b->{by}, $b->{reverse}, $a) }
54 @{$remapped{outside_order}},
58 $remapped{default_inside_alias},
60 $remapped{inside_select_list},
61 $remapped{inner_body},