my %proto = (
ref($args) eq 'HASH'
? %$args
- : (to => $args->[0], @{$args}[1..$#$args])
+ : (to => @$args)
);
if (my $as = delete $proto{as}) {
- $proto{to} = $self->expand_expr({ -as => [ $proto{to}, $as ] });
+ $proto{to} = $self->expand_expr(
+ { -as => [ { -from_list => $proto{to} }, $as ] }
+ );
}
if (defined($proto{using}) and ref(my $using = $proto{using}) ne 'HASH') {
$proto{using} = [
ref($using) eq 'ARRAY' ? @$using: $using
];
}
- my %ret = map +($_ => $self->expand_expr($proto{$_}, -ident)),
- sort keys %proto;
+ my %ret = (
+ type => delete $proto{type},
+ to => $self->expand_expr({ -from_list => delete $proto{to} }, -ident)
+ ->{-from_list}[0]
+ );
+ %ret = (%ret,
+ map +($_ => $self->expand_expr($proto{$_}, -ident)),
+ sort keys %proto
+ );
return +{ -join => \%ret };
}
my @parts = (
$args->{from},
{ -keyword => join '_', ($args->{type}||()), 'join' },
- (map +($_->{-ident} || $_->{-as} ? $_ : ('(', $_, ')')), $args->{to}),
+ (map +($_->{-ident} || $_->{-as}
+ ? $_
+ : ('(', $self->render_aqt($_, 1), ')')),
+ $args->{to}
+ ),
($args->{on} ? (
{ -keyword => 'on' },
$args->{on},
CAST(birthday AS date)
[]
+=head2 join
+
+If given an arrayref, pretends it was given a hashref with the first
+element of the arrayref as the value for 'to' and the remaining pairs copied.
+
+Given a hashref, the 'as' key is if presented expanded to wrap the 'to'.
+
+If present the 'using' key is expanded as a list of idents.
+
+Known keys are: 'from' (the left hand side), 'type' ('left', 'right', or
+nothing), 'to' (the right hand side), 'on' and 'using'.
+
+ # expr
+ { -join => {
+ from => 'lft',
+ on => { 'lft.bloo' => { '>' => 'rgt.blee' } },
+ to => 'rgt',
+ type => 'left',
+ } }
+
+ # aqt
+ { -join => {
+ from => { -ident => [ 'lft' ] },
+ on => { -op => [
+ '>', { -ident => [ 'lft', 'bloo' ] },
+ { -ident => [ 'rgt', 'blee' ] },
+ ] },
+ to => { -ident => [ 'rgt' ] },
+ type => 'left',
+ } }
+
+ # query
+ lft LEFT JOIN rgt ON lft.bloo > rgt.blee
+ []
+
+=head2 from_list
+
+List of components of the FROM clause; -foo type elements indicate a pair
+with the next element; this is easiest if I show you:
+
+ # expr
+ { -from_list => [
+ 't1', -as => 'table_one', -join =>
+ [ 't2', 'on', { 'table_one.x' => 't2.x' } ],
+ ] }
+
+ # aqt
+ { -from_list => [ { -join => {
+ from => { -as => [
+ { -ident => [ 't1' ] },
+ { -alias => [ { -ident => [ 'table_one' ] } ] },
+ ] },
+ on => { -op => [
+ '=', { -ident => [ 'table_one', 'x' ] },
+ { -ident => [ 't2', 'x' ] },
+ ] },
+ to => { -ident => [ 't2' ] },
+ type => undef,
+ } } ] }
+
+ # query
+ t1 AS table_one JOIN t2 ON table_one.x = t2.x
+ []
+
+Or with using:
+
+ # expr
+ { -from_list =>
+ [ 't1', -as => 'table_one', -join => [ 't2', 'using', [ 'x' ] ] ]
+ }
+
+ # aqt
+ { -from_list => [ { -join => {
+ from => { -as => [
+ { -ident => [ 't1' ] },
+ { -alias => [ { -ident => [ 'table_one' ] } ] },
+ ] },
+ to => { -ident => [ 't2' ] },
+ type => undef,
+ using =>
+ {
+ -op => [ 'or', { -op => [ 'or', { -ident => [ 'x' ] } ] } ]
+ },
+ } } ] }
+
+ # query
+ t1 AS table_one JOIN t2 USING ( x )
+ []
+
+With oddities:
+
+ # expr
+ { -from_list => [
+ 'x', -join =>
+ [ [ 'y', -join => [ 'z', 'type', 'left' ] ], 'type', 'left' ],
+ ] }
+
+ # aqt
+ { -from_list => [ { -join => {
+ from => { -ident => [ 'x' ] },
+ to => { -join => {
+ from => { -ident => [ 'y' ] },
+ to => { -ident => [ 'z' ] },
+ type => 'left',
+ } },
+ type => 'left',
+ } } ] }
+
+ # query
+ x LEFT JOIN ( y LEFT JOIN z )
+ []
+
=cut