# {from} specs, aiding the RDBMS query optimizer
#
sub _prune_unused_joins {
- my ($self) = shift;
-
+ my $self = shift;
my ($from, $select, $where, $attrs) = @_;
+ return $from unless $self->_use_join_optimizer;
+
if (ref $from ne 'ARRAY' || ref $from->[0] ne 'HASH' || ref $from->[1] ne 'ARRAY') {
return $from; # only standard {from} specs are supported
}
# {multiplying} joins can go
delete $aliastypes->{multiplying} if $attrs->{group_by};
-
my @newfrom = $from->[0]; # FROM head is always present
my %need_joins = (map { %{$_||{}} } (values %$aliastypes) );
push @{$inner_attrs->{as}}, $attrs->{as}[$i];
}
- # construct the inner $from for the subquery
+ # construct the inner $from and lock it in a subquery
# we need to prune first, because this will determine if we need a group_by below
- my $inner_from = $self->_prune_unused_joins ($from, $inner_select, $where, $inner_attrs);
-
- # if a multi-type join was needed in the subquery - add a group_by to simulate the
- # collapse in the subq
- $inner_attrs->{group_by} ||= $inner_select
- if first { ! $_->[0]{-is_single} } (@{$inner_from}[1 .. $#$inner_from]);
-
- # generate the subquery
- my $subq = $self->_select_args_to_query (
- $inner_from,
- $inner_select,
- $where,
- $inner_attrs,
- );
+ # the fake group_by is so that the pruner throws away all non-selecting, non-restricting
+ # multijoins (since we def. do not care about those inside the subquery)
+
+ my $subq_joinspec = do {
+
+ # must use it here regardless of user requests
+ local $self->{_use_join_optimizer} = 1;
+
+ my $inner_from = $self->_prune_unused_joins ($from, $inner_select, $where, {
+ group_by => ['dummy'], %$inner_attrs,
+ });
- my $subq_joinspec = {
- -alias => $attrs->{alias},
- -source_handle => $inner_from->[0]{-source_handle},
- $attrs->{alias} => $subq,
+ # if a multi-type join was needed in the subquery - add a group_by to simulate the
+ # collapse in the subq
+ $inner_attrs->{group_by} ||= $inner_select
+ if first { ! $_->[0]{-is_single} } (@{$inner_from}[1 .. $#$inner_from]);
+
+ # we already optimized $inner_from above
+ local $self->{_use_join_optimizer} = 0;
+
+ # generate the subquery
+ my $subq = $self->_select_args_to_query (
+ $inner_from,
+ $inner_select,
+ $where,
+ $inner_attrs,
+ );
+
+ +{
+ -alias => $attrs->{alias},
+ -source_handle => $inner_from->[0]{-source_handle},
+ $attrs->{alias} => $subq,
+ };
};
# Generate the outer from - this is relatively easy (really just replace
# - it is part of the restrictions, in which case we need to collapse the outer
# result by tackling yet another group_by to the outside of the query
- # normalize a copy of $from, so it will be easier to work with further
- # down (i.e. promote the initial hashref to an AoH)
$from = [ @$from ];
- $from->[0] = [ $from->[0] ];
# so first generate the outer_from, up to the substitution point
my @outer_from;
while (my $j = shift @$from) {
+ $j = [ $j ] unless ref $j eq 'ARRAY'; # promote the head-from to an AoH
+
if ($j->[0]{-alias} eq $attrs->{alias}) { # time to swap
push @outer_from, [
$subq_joinspec,
}
}
- # scan the from spec against different attributes, and see which joins are needed
+ # scan the *remaining* from spec against different attributes, and see which joins are needed
# in what role
my $outer_aliastypes =
$self->_resolve_aliastypes_from_select_args( $from, $outer_select, $where, $outer_attrs );
$alias_list->{$al} = $j;
$aliases_by_type->{multiplying}{$al} = 1
- unless $j->{-is_single};
+ if ref($_) eq 'ARRAY' and ! $j->{-is_single}; # not array == {from} head == can't be multiplying
}
# get a column to source/alias map (including unqualified ones)
# set up a botched SQLA
my $sql_maker = $self->sql_maker;
- my $sep = quotemeta ($self->_sql_maker_opts->{name_sep} || '.');
- my ($orig_lquote, $orig_rquote) = map { quotemeta $_ } (do {
- if (ref $sql_maker->{quote_char} eq 'ARRAY') {
- @{$sql_maker->{quote_char}}
- }
- else {
- ($sql_maker->{quote_char} || '') x 2;
- }
- });
+ local $sql_maker->{having_bind}; # these are throw away results
- local $sql_maker->{quote_char} = "\x00"; # so that we can regex away
+ # we can't scan properly without any quoting (\b doesn't cut it
+ # everywhere), so unless there is proper quoting set - use our
+ # own weird impossible character.
+ # Also in the case of no quoting, we need to explicitly disable
+ # name_sep, otherwise sorry nasty legacy syntax like
+ # { 'count(foo.id)' => { '>' => 3 } } will stop working >:(
+ local $sql_maker->{quote_char} = $sql_maker->{quote_char};
+ local $sql_maker->{name_sep} = $sql_maker->{name_sep};
+
+ unless (defined $sql_maker->{quote_char} and length $sql_maker->{quote_char}) {
+ $sql_maker->{quote_char} = "\x00";
+ $sql_maker->{name_sep} = '';
+ }
+
+ my ($lquote, $rquote, $sep) = map { quotemeta $_ } ($sql_maker->_quote_chars, $sql_maker->name_sep);
# generate sql chunks
- local $sql_maker->{having_bind}; # these are throw away results
my $to_scan = {
restricting => [
$sql_maker->_recurse_where ($where),
}),
],
selecting => [
- $self->_parse_order_by ($attrs->{order_by}, $sql_maker),
+ $self->_extract_order_columns ($attrs->{order_by}, $sql_maker),
$sql_maker->_recurse_fields ($select),
],
};
# alias (should work even if they are in scalarrefs)
for my $alias (keys %$alias_list) {
my $al_re = qr/
- \x00 $alias \x00 $sep
+ $lquote $alias $rquote $sep
|
- \b $alias $sep
+ \b $alias \.
/x;
- # add matching for possible quoted literal sql
- $al_re = qr/ $al_re | $orig_lquote $alias $orig_rquote /x
- if ($orig_lquote && $orig_rquote);
-
-
for my $type (keys %$to_scan) {
for my $piece (@{$to_scan->{$type}}) {
$aliases_by_type->{$type}{$alias} = 1 if ($piece =~ $al_re);
# now loop through unqualified column names, and try to locate them within
# the chunks
for my $col (keys %$colinfo) {
- next if $col =~ $sep; # if column is qualified it was caught by the above
-
- my $col_re = qr/ \x00 $col \x00 /x;
+ next if $col =~ / \. /x; # if column is qualified it was caught by the above
- $col_re = qr/ $col_re | $orig_lquote $col $orig_rquote /x
- if ($orig_lquote && $orig_rquote);
+ my $col_re = qr/ $lquote $col $rquote /x;
for my $type (keys %$to_scan) {
for my $piece (@{$to_scan->{$type}}) {
);
}
- # mark all join parents as mentioned
+ # mark all restricting/selecting join parents as such
# (e.g. join => { cds => 'tracks' } - tracks will need to bring cds too )
- for my $type (keys %$aliases_by_type) {
- for my $alias (keys %{$aliases_by_type->{$type}}) {
+ for my $type (qw/restricting selecting/) {
+ for my $alias (keys %{$aliases_by_type->{$type}||{}}) {
$aliases_by_type->{$type}{$_} = 1
for (map { values %$_ } @{ $alias_list->{$alias}{-join_path} || [] });
}
my ($self, $ident, $colnames) = @_;
my ($alias2src, $root_alias) = $self->_resolve_ident_sources($ident);
- my $sep = $self->_sql_maker_opts->{name_sep} || '.';
- my $qsep = quotemeta $sep;
-
my (%return, %seen_cols, @auto_colnames);
# compile a global list of column names, to be able to properly
my $rsrc = $alias2src->{$alias};
for my $colname ($rsrc->columns) {
push @{$seen_cols{$colname}}, $alias;
- push @auto_colnames, "$alias$sep$colname" unless $colnames;
+ push @auto_colnames, "$alias.$colname" unless $colnames;
}
}
COLUMN:
foreach my $col (@$colnames) {
- my ($alias, $colname) = $col =~ m/^ (?: ([^$qsep]+) $qsep)? (.+) $/x;
+ my ($alias, $colname) = $col =~ m/^ (?: ([^\.]+) \. )? (.+) $/x;
unless ($alias) {
# see if the column was seen exactly once (so we know which rsrc it came from)
}
else {
foreach my $key (keys %$where) {
- $key =~ /([^.]+)$/;
- $cond->{$1} = $where->{$key};
+ if ($key eq '-or' && ref $where->{$key} eq 'ARRAY') {
+ $cond->{$key} = $self->_strip_cond_qualifiers($where->{$key});
+ }
+ else {
+ $key =~ /([^.]+)$/;
+ $cond->{$1} = $where->{$key};
+ }
}
}
}
return $cond;
}
-sub _parse_order_by {
+sub _extract_order_columns {
my ($self, $order_by, $sql_maker) = @_;
my $parser = sub {
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