my ($self, $op, $args) = @_;
return undef unless @$args;
return $self->join_query_parts('', $args->[0]) if @$args == 1;
+ my $inner = $self->_render_op_multop($op, $args);
+ return undef unless defined($inner->[0]) and length($inner->[0]);
return $self->join_query_parts(' ',
- '(', $self->_render_op_multop($op, $args), ')'
+ '(', $inner, ')'
);
}
: ((ref($_) eq 'ARRAY') ? $_ : [ $_ ])
), @parts;
return [
- $self->{join_sql_parts}->($join, map $_->[0], @final),
+ $self->{join_sql_parts}->($join, grep defined, map $_->[0], @final),
(map @{$_}[1..$#$_], @final),
];
}