Commit | Line | Data |
c443438f |
1 | package #hide from PAUSE |
2 | DBIx::Class::Storage::DBIHacks; |
d28bb90d |
3 | |
4 | # |
5 | # This module contains code that should never have seen the light of day, |
6 | # does not belong in the Storage, or is otherwise unfit for public |
7eb76996 |
7 | # display. The arrival of SQLA2 should immediately oboslete 90% of this |
d28bb90d |
8 | # |
9 | |
10 | use strict; |
11 | use warnings; |
12 | |
13 | use base 'DBIx::Class::Storage'; |
14 | use mro 'c3'; |
15 | |
6298a324 |
16 | use List::Util 'first'; |
17 | use Scalar::Util 'blessed'; |
18 | use namespace::clean; |
d28bb90d |
19 | |
20 | # |
052e8431 |
21 | # This code will remove non-selecting/non-restricting joins from |
4b1b5ea3 |
22 | # {from} specs, aiding the RDBMS query optimizer |
052e8431 |
23 | # |
24 | sub _prune_unused_joins { |
ea95892e |
25 | my $self = shift; |
4b1b5ea3 |
26 | my ($from, $select, $where, $attrs) = @_; |
052e8431 |
27 | |
ea95892e |
28 | return $from unless $self->_use_join_optimizer; |
29 | |
052e8431 |
30 | if (ref $from ne 'ARRAY' || ref $from->[0] ne 'HASH' || ref $from->[1] ne 'ARRAY') { |
31 | return $from; # only standard {from} specs are supported |
32 | } |
33 | |
4b1b5ea3 |
34 | my $aliastypes = $self->_resolve_aliastypes_from_select_args(@_); |
35 | |
36 | # a grouped set will not be affected by amount of rows. Thus any |
37 | # {multiplying} joins can go |
38 | delete $aliastypes->{multiplying} if $attrs->{group_by}; |
39 | |
052e8431 |
40 | my @newfrom = $from->[0]; # FROM head is always present |
41 | |
a4812caa |
42 | my %need_joins; |
43 | for (values %$aliastypes) { |
44 | # add all requested aliases |
45 | $need_joins{$_} = 1 for keys %$_; |
46 | |
47 | # add all their parents (as per joinpath which is an AoH { table => alias }) |
48 | $need_joins{$_} = 1 for map { values %$_ } map { @$_ } values %$_; |
49 | } |
052e8431 |
50 | for my $j (@{$from}[1..$#$from]) { |
539ffe87 |
51 | push @newfrom, $j if ( |
4b1b5ea3 |
52 | (! $j->[0]{-alias}) # legacy crap |
539ffe87 |
53 | || |
54 | $need_joins{$j->[0]{-alias}} |
55 | ); |
052e8431 |
56 | } |
57 | |
58 | return \@newfrom; |
59 | } |
60 | |
052e8431 |
61 | # |
d28bb90d |
62 | # This is the code producing joined subqueries like: |
63 | # SELECT me.*, other.* FROM ( SELECT me.* FROM ... ) JOIN other ON ... |
64 | # |
65 | sub _adjust_select_args_for_complex_prefetch { |
66 | my ($self, $from, $select, $where, $attrs) = @_; |
67 | |
68 | $self->throw_exception ('Nothing to prefetch... how did we get here?!') |
36fd7f07 |
69 | if not @{$attrs->{_prefetch_selector_range}}; |
d28bb90d |
70 | |
71 | $self->throw_exception ('Complex prefetches are not supported on resultsets with a custom from attribute') |
72 | if (ref $from ne 'ARRAY' || ref $from->[0] ne 'HASH' || ref $from->[1] ne 'ARRAY'); |
73 | |
74 | |
75 | # generate inner/outer attribute lists, remove stuff that doesn't apply |
76 | my $outer_attrs = { %$attrs }; |
77 | delete $outer_attrs->{$_} for qw/where bind rows offset group_by having/; |
78 | |
79 | my $inner_attrs = { %$attrs }; |
36fd7f07 |
80 | delete $inner_attrs->{$_} for qw/for collapse _prefetch_selector_range _collapse_order_by select as/; |
d28bb90d |
81 | |
82 | |
83 | # bring over all non-collapse-induced order_by into the inner query (if any) |
84 | # the outer one will have to keep them all |
85 | delete $inner_attrs->{order_by}; |
86 | if (my $ord_cnt = @{$outer_attrs->{order_by}} - @{$outer_attrs->{_collapse_order_by}} ) { |
87 | $inner_attrs->{order_by} = [ |
88 | @{$outer_attrs->{order_by}}[ 0 .. $ord_cnt - 1] |
89 | ]; |
90 | } |
91 | |
d28bb90d |
92 | # generate the inner/outer select lists |
93 | # for inside we consider only stuff *not* brought in by the prefetch |
94 | # on the outside we substitute any function for its alias |
95 | my $outer_select = [ @$select ]; |
96 | my $inner_select = []; |
36fd7f07 |
97 | |
98 | my ($p_start, $p_end) = @{$outer_attrs->{_prefetch_selector_range}}; |
99 | for my $i (0 .. $p_start - 1, $p_end + 1 .. $#$outer_select) { |
d28bb90d |
100 | my $sel = $outer_select->[$i]; |
101 | |
102 | if (ref $sel eq 'HASH' ) { |
103 | $sel->{-as} ||= $attrs->{as}[$i]; |
104 | $outer_select->[$i] = join ('.', $attrs->{alias}, ($sel->{-as} || "inner_column_$i") ); |
105 | } |
106 | |
107 | push @$inner_select, $sel; |
bb9bffea |
108 | |
109 | push @{$inner_attrs->{as}}, $attrs->{as}[$i]; |
d28bb90d |
110 | } |
111 | |
ea95892e |
112 | # construct the inner $from and lock it in a subquery |
48580715 |
113 | # we need to prune first, because this will determine if we need a group_by below |
53c29913 |
114 | # the fake group_by is so that the pruner throws away all non-selecting, non-restricting |
115 | # multijoins (since we def. do not care about those inside the subquery) |
ea95892e |
116 | |
6395604e |
117 | my $inner_subq = do { |
ea95892e |
118 | |
119 | # must use it here regardless of user requests |
120 | local $self->{_use_join_optimizer} = 1; |
121 | |
122 | my $inner_from = $self->_prune_unused_joins ($from, $inner_select, $where, { |
123 | group_by => ['dummy'], %$inner_attrs, |
124 | }); |
125 | |
887a0aef |
126 | my $inner_aliastypes = |
127 | $self->_resolve_aliastypes_from_select_args( $inner_from, $inner_select, $where, $inner_attrs ); |
128 | |
a4812caa |
129 | # we need to simulate collapse in the subq if a multiplying join is pulled |
130 | # by being a non-selecting restrictor |
0a3441ee |
131 | if ( |
132 | ! $inner_attrs->{group_by} |
133 | and |
887a0aef |
134 | first { |
135 | $inner_aliastypes->{restricting}{$_} |
136 | and |
137 | ! $inner_aliastypes->{selecting}{$_} |
138 | } ( keys %{$inner_aliastypes->{multiplying}||{}} ) |
0a3441ee |
139 | ) { |
14e26c5f |
140 | my $unprocessed_order_chunks; |
141 | ($inner_attrs->{group_by}, $unprocessed_order_chunks) = $self->_group_over_selection ( |
0a3441ee |
142 | $inner_from, $inner_select, $inner_attrs->{order_by} |
143 | ); |
14e26c5f |
144 | |
145 | $self->throw_exception ( |
146 | 'A required group_by clause could not be constructed automatically due to a complex ' |
147 | . 'order_by criteria. Either order_by columns only (no functions) or construct a suitable ' |
148 | . 'group_by by hand' |
149 | ) if $unprocessed_order_chunks; |
0a3441ee |
150 | } |
ea95892e |
151 | |
152 | # we already optimized $inner_from above |
153 | local $self->{_use_join_optimizer} = 0; |
154 | |
155 | # generate the subquery |
6395604e |
156 | $self->_select_args_to_query ( |
ea95892e |
157 | $inner_from, |
158 | $inner_select, |
159 | $where, |
160 | $inner_attrs, |
161 | ); |
d28bb90d |
162 | }; |
163 | |
164 | # Generate the outer from - this is relatively easy (really just replace |
165 | # the join slot with the subquery), with a major caveat - we can not |
166 | # join anything that is non-selecting (not part of the prefetch), but at |
167 | # the same time is a multi-type relationship, as it will explode the result. |
168 | # |
169 | # There are two possibilities here |
170 | # - either the join is non-restricting, in which case we simply throw it away |
171 | # - it is part of the restrictions, in which case we need to collapse the outer |
172 | # result by tackling yet another group_by to the outside of the query |
173 | |
052e8431 |
174 | $from = [ @$from ]; |
052e8431 |
175 | |
d28bb90d |
176 | # so first generate the outer_from, up to the substitution point |
177 | my @outer_from; |
178 | while (my $j = shift @$from) { |
53c29913 |
179 | $j = [ $j ] unless ref $j eq 'ARRAY'; # promote the head-from to an AoH |
180 | |
d28bb90d |
181 | if ($j->[0]{-alias} eq $attrs->{alias}) { # time to swap |
6395604e |
182 | |
d28bb90d |
183 | push @outer_from, [ |
6395604e |
184 | { |
185 | -alias => $attrs->{alias}, |
186 | -rsrc => $j->[0]{-rsrc}, |
187 | $attrs->{alias} => $inner_subq, |
188 | }, |
d28bb90d |
189 | @{$j}[1 .. $#$j], |
190 | ]; |
191 | last; # we'll take care of what's left in $from below |
192 | } |
193 | else { |
194 | push @outer_from, $j; |
195 | } |
196 | } |
197 | |
ea95892e |
198 | # scan the *remaining* from spec against different attributes, and see which joins are needed |
052e8431 |
199 | # in what role |
200 | my $outer_aliastypes = |
539ffe87 |
201 | $self->_resolve_aliastypes_from_select_args( $from, $outer_select, $where, $outer_attrs ); |
052e8431 |
202 | |
a4812caa |
203 | # unroll parents |
204 | my ($outer_select_chain, $outer_restrict_chain) = map { +{ |
205 | map { $_ => 1 } map { values %$_} map { @$_ } values %{ $outer_aliastypes->{$_} || {} } |
206 | } } qw/selecting restricting/; |
207 | |
d28bb90d |
208 | # see what's left - throw away if not selecting/restricting |
a4812caa |
209 | # also throw in a group_by if a non-selecting multiplier, |
210 | # to guard against cross-join explosions |
36fd7f07 |
211 | my $need_outer_group_by; |
d28bb90d |
212 | while (my $j = shift @$from) { |
213 | my $alias = $j->[0]{-alias}; |
214 | |
a4812caa |
215 | if ( |
216 | $outer_select_chain->{$alias} |
217 | ) { |
218 | push @outer_from, $j |
d28bb90d |
219 | } |
a4812caa |
220 | elsif ($outer_restrict_chain->{$alias}) { |
d28bb90d |
221 | push @outer_from, $j; |
a4812caa |
222 | $need_outer_group_by ||= $outer_aliastypes->{multiplying}{$alias} ? 1 : 0; |
d28bb90d |
223 | } |
224 | } |
225 | |
226 | # demote the outer_from head |
227 | $outer_from[0] = $outer_from[0][0]; |
228 | |
36fd7f07 |
229 | if ($need_outer_group_by and ! $outer_attrs->{group_by}) { |
230 | |
231 | my $unprocessed_order_chunks; |
232 | ($outer_attrs->{group_by}, $unprocessed_order_chunks) = $self->_group_over_selection ( |
233 | \@outer_from, $outer_select, $outer_attrs->{order_by} |
234 | ); |
235 | |
236 | $self->throw_exception ( |
237 | 'A required group_by clause could not be constructed automatically due to a complex ' |
238 | . 'order_by criteria. Either order_by columns only (no functions) or construct a suitable ' |
239 | . 'group_by by hand' |
240 | ) if $unprocessed_order_chunks; |
241 | |
242 | } |
243 | |
d28bb90d |
244 | # This is totally horrific - the $where ends up in both the inner and outer query |
245 | # Unfortunately not much can be done until SQLA2 introspection arrives, and even |
246 | # then if where conditions apply to the *right* side of the prefetch, you may have |
247 | # to both filter the inner select (e.g. to apply a limit) and then have to re-filter |
248 | # the outer select to exclude joins you didin't want in the first place |
249 | # |
250 | # OTOH it can be seen as a plus: <ash> (notes that this query would make a DBA cry ;) |
251 | return (\@outer_from, $outer_select, $where, $outer_attrs); |
252 | } |
253 | |
1a736efb |
254 | # |
255 | # I KNOW THIS SUCKS! GET SQLA2 OUT THE DOOR SO THIS CAN DIE! |
256 | # |
ad630f4b |
257 | # Due to a lack of SQLA2 we fall back to crude scans of all the |
258 | # select/where/order/group attributes, in order to determine what |
259 | # aliases are neded to fulfill the query. This information is used |
260 | # throughout the code to prune unnecessary JOINs from the queries |
261 | # in an attempt to reduce the execution time. |
262 | # Although the method is pretty horrific, the worst thing that can |
1a736efb |
263 | # happen is for it to fail due to some scalar SQL, which in turn will |
264 | # result in a vocal exception. |
539ffe87 |
265 | sub _resolve_aliastypes_from_select_args { |
052e8431 |
266 | my ( $self, $from, $select, $where, $attrs ) = @_; |
546f1cd9 |
267 | |
ad630f4b |
268 | $self->throw_exception ('Unable to analyze custom {from}') |
269 | if ref $from ne 'ARRAY'; |
546f1cd9 |
270 | |
ad630f4b |
271 | # what we will return |
964a3c71 |
272 | my $aliases_by_type; |
546f1cd9 |
273 | |
ad630f4b |
274 | # see what aliases are there to work with |
275 | my $alias_list; |
539ffe87 |
276 | for (@$from) { |
277 | my $j = $_; |
ad630f4b |
278 | $j = $j->[0] if ref $j eq 'ARRAY'; |
539ffe87 |
279 | my $al = $j->{-alias} |
280 | or next; |
281 | |
282 | $alias_list->{$al} = $j; |
a4812caa |
283 | $aliases_by_type->{multiplying}{$al} ||= $j->{-join_path}||[] if ( |
284 | # not array == {from} head == can't be multiplying |
285 | ( ref($_) eq 'ARRAY' and ! $j->{-is_single} ) |
286 | or |
287 | # a parent of ours is already a multiplier |
288 | ( grep { $aliases_by_type->{multiplying}{$_} } @{ $j->{-join_path}||[] } ) |
289 | ); |
546f1cd9 |
290 | } |
546f1cd9 |
291 | |
1a736efb |
292 | # get a column to source/alias map (including unqualified ones) |
293 | my $colinfo = $self->_resolve_column_info ($from); |
294 | |
ad630f4b |
295 | # set up a botched SQLA |
296 | my $sql_maker = $self->sql_maker; |
07f31d19 |
297 | |
4c2b30d6 |
298 | # these are throw away results, do not pollute the bind stack |
4c2b30d6 |
299 | local $sql_maker->{select_bind}; |
0542ec57 |
300 | local $sql_maker->{where_bind}; |
301 | local $sql_maker->{group_bind}; |
302 | local $sql_maker->{having_bind}; |
3f5b99fe |
303 | |
304 | # we can't scan properly without any quoting (\b doesn't cut it |
305 | # everywhere), so unless there is proper quoting set - use our |
306 | # own weird impossible character. |
307 | # Also in the case of no quoting, we need to explicitly disable |
308 | # name_sep, otherwise sorry nasty legacy syntax like |
309 | # { 'count(foo.id)' => { '>' => 3 } } will stop working >:( |
310 | local $sql_maker->{quote_char} = $sql_maker->{quote_char}; |
311 | local $sql_maker->{name_sep} = $sql_maker->{name_sep}; |
312 | |
313 | unless (defined $sql_maker->{quote_char} and length $sql_maker->{quote_char}) { |
e493ecb2 |
314 | $sql_maker->{quote_char} = ["\x00", "\xFF"]; |
315 | # if we don't unset it we screw up retarded but unfortunately working |
316 | # 'MAX(foo.bar)' => { '>', 3 } |
3f5b99fe |
317 | $sql_maker->{name_sep} = ''; |
318 | } |
319 | |
320 | my ($lquote, $rquote, $sep) = map { quotemeta $_ } ($sql_maker->_quote_chars, $sql_maker->name_sep); |
07f31d19 |
321 | |
1a736efb |
322 | # generate sql chunks |
323 | my $to_scan = { |
324 | restricting => [ |
325 | $sql_maker->_recurse_where ($where), |
a7e643b1 |
326 | $sql_maker->_parse_rs_attrs ({ |
1a736efb |
327 | map { $_ => $attrs->{$_} } (qw/group_by having/) |
328 | }), |
329 | ], |
330 | selecting => [ |
1a736efb |
331 | $sql_maker->_recurse_fields ($select), |
bac358c9 |
332 | ( map { $_->[0] } $self->_extract_order_criteria ($attrs->{order_by}, $sql_maker) ), |
1a736efb |
333 | ], |
334 | }; |
335 | |
336 | # throw away empty chunks |
337 | $_ = [ map { $_ || () } @$_ ] for values %$to_scan; |
338 | |
339 | # first loop through all fully qualified columns and get the corresponding |
340 | # alias (should work even if they are in scalarrefs) |
ad630f4b |
341 | for my $alias (keys %$alias_list) { |
1a736efb |
342 | my $al_re = qr/ |
3f5b99fe |
343 | $lquote $alias $rquote $sep |
1a736efb |
344 | | |
3f5b99fe |
345 | \b $alias \. |
1a736efb |
346 | /x; |
347 | |
1a736efb |
348 | for my $type (keys %$to_scan) { |
349 | for my $piece (@{$to_scan->{$type}}) { |
a4812caa |
350 | $aliases_by_type->{$type}{$alias} ||= $alias_list->{$alias}{-join_path}||[] |
351 | if ($piece =~ $al_re); |
1a736efb |
352 | } |
ad630f4b |
353 | } |
1a736efb |
354 | } |
355 | |
356 | # now loop through unqualified column names, and try to locate them within |
357 | # the chunks |
358 | for my $col (keys %$colinfo) { |
3f5b99fe |
359 | next if $col =~ / \. /x; # if column is qualified it was caught by the above |
1a736efb |
360 | |
3f5b99fe |
361 | my $col_re = qr/ $lquote $col $rquote /x; |
1a736efb |
362 | |
363 | for my $type (keys %$to_scan) { |
364 | for my $piece (@{$to_scan->{$type}}) { |
a4812caa |
365 | if ($piece =~ $col_re) { |
366 | my $alias = $colinfo->{$col}{-source_alias}; |
367 | $aliases_by_type->{$type}{$alias} ||= $alias_list->{$alias}{-join_path}||[]; |
368 | } |
1a736efb |
369 | } |
07f31d19 |
370 | } |
371 | } |
372 | |
373 | # Add any non-left joins to the restriction list (such joins are indeed restrictions) |
ad630f4b |
374 | for my $j (values %$alias_list) { |
07f31d19 |
375 | my $alias = $j->{-alias} or next; |
a4812caa |
376 | $aliases_by_type->{restricting}{$alias} ||= $j->{-join_path}||[] if ( |
07f31d19 |
377 | (not $j->{-join_type}) |
378 | or |
379 | ($j->{-join_type} !~ /^left (?: \s+ outer)? $/xi) |
380 | ); |
381 | } |
382 | |
964a3c71 |
383 | return $aliases_by_type; |
07f31d19 |
384 | } |
385 | |
bac358c9 |
386 | # This is the engine behind { distinct => 1 } |
0a3441ee |
387 | sub _group_over_selection { |
388 | my ($self, $from, $select, $order_by) = @_; |
389 | |
390 | my $rs_column_list = $self->_resolve_column_info ($from); |
391 | |
392 | my (@group_by, %group_index); |
393 | |
36fd7f07 |
394 | # the logic is: if it is a { func => val } we assume an aggregate, |
395 | # otherwise if \'...' or \[...] we assume the user knows what is |
396 | # going on thus group over it |
0a3441ee |
397 | for (@$select) { |
398 | if (! ref($_) or ref ($_) ne 'HASH' ) { |
399 | push @group_by, $_; |
400 | $group_index{$_}++; |
401 | if ($rs_column_list->{$_} and $_ !~ /\./ ) { |
402 | # add a fully qualified version as well |
403 | $group_index{"$rs_column_list->{$_}{-source_alias}.$_"}++; |
404 | } |
405 | } |
406 | } |
407 | |
408 | # add any order_by parts that are not already present in the group_by |
409 | # we need to be careful not to add any named functions/aggregates |
bac358c9 |
410 | # i.e. order_by => [ ... { count => 'foo' } ... ] |
14e26c5f |
411 | my @leftovers; |
bac358c9 |
412 | for ($self->_extract_order_criteria($order_by)) { |
0a3441ee |
413 | # only consider real columns (for functions the user got to do an explicit group_by) |
14e26c5f |
414 | if (@$_ != 1) { |
415 | push @leftovers, $_; |
416 | next; |
417 | } |
bac358c9 |
418 | my $chunk = $_->[0]; |
14e26c5f |
419 | my $colinfo = $rs_column_list->{$chunk} or do { |
420 | push @leftovers, $_; |
421 | next; |
422 | }; |
0a3441ee |
423 | |
424 | $chunk = "$colinfo->{-source_alias}.$chunk" if $chunk !~ /\./; |
425 | push @group_by, $chunk unless $group_index{$chunk}++; |
426 | } |
427 | |
14e26c5f |
428 | return wantarray |
429 | ? (\@group_by, (@leftovers ? \@leftovers : undef) ) |
430 | : \@group_by |
431 | ; |
0a3441ee |
432 | } |
433 | |
d28bb90d |
434 | sub _resolve_ident_sources { |
435 | my ($self, $ident) = @_; |
436 | |
437 | my $alias2source = {}; |
438 | my $rs_alias; |
439 | |
440 | # the reason this is so contrived is that $ident may be a {from} |
441 | # structure, specifying multiple tables to join |
6298a324 |
442 | if ( blessed $ident && $ident->isa("DBIx::Class::ResultSource") ) { |
d28bb90d |
443 | # this is compat mode for insert/update/delete which do not deal with aliases |
444 | $alias2source->{me} = $ident; |
445 | $rs_alias = 'me'; |
446 | } |
447 | elsif (ref $ident eq 'ARRAY') { |
448 | |
449 | for (@$ident) { |
450 | my $tabinfo; |
451 | if (ref $_ eq 'HASH') { |
452 | $tabinfo = $_; |
453 | $rs_alias = $tabinfo->{-alias}; |
454 | } |
455 | if (ref $_ eq 'ARRAY' and ref $_->[0] eq 'HASH') { |
456 | $tabinfo = $_->[0]; |
457 | } |
458 | |
4376a157 |
459 | $alias2source->{$tabinfo->{-alias}} = $tabinfo->{-rsrc} |
460 | if ($tabinfo->{-rsrc}); |
d28bb90d |
461 | } |
462 | } |
463 | |
464 | return ($alias2source, $rs_alias); |
465 | } |
466 | |
467 | # Takes $ident, \@column_names |
468 | # |
469 | # returns { $column_name => \%column_info, ... } |
470 | # also note: this adds -result_source => $rsrc to the column info |
471 | # |
09e14fdc |
472 | # If no columns_names are supplied returns info about *all* columns |
473 | # for all sources |
d28bb90d |
474 | sub _resolve_column_info { |
475 | my ($self, $ident, $colnames) = @_; |
476 | my ($alias2src, $root_alias) = $self->_resolve_ident_sources($ident); |
477 | |
52416317 |
478 | my (%seen_cols, @auto_colnames); |
d28bb90d |
479 | |
480 | # compile a global list of column names, to be able to properly |
481 | # disambiguate unqualified column names (if at all possible) |
482 | for my $alias (keys %$alias2src) { |
483 | my $rsrc = $alias2src->{$alias}; |
484 | for my $colname ($rsrc->columns) { |
485 | push @{$seen_cols{$colname}}, $alias; |
3f5b99fe |
486 | push @auto_colnames, "$alias.$colname" unless $colnames; |
d28bb90d |
487 | } |
488 | } |
489 | |
09e14fdc |
490 | $colnames ||= [ |
491 | @auto_colnames, |
492 | grep { @{$seen_cols{$_}} == 1 } (keys %seen_cols), |
493 | ]; |
494 | |
52416317 |
495 | my (%return, $colinfos); |
d28bb90d |
496 | foreach my $col (@$colnames) { |
52416317 |
497 | my ($source_alias, $colname) = $col =~ m/^ (?: ([^\.]+) \. )? (.+) $/x; |
d28bb90d |
498 | |
52416317 |
499 | # if the column was seen exactly once - we know which rsrc it came from |
500 | $source_alias ||= $seen_cols{$colname}[0] |
501 | if ($seen_cols{$colname} and @{$seen_cols{$colname}} == 1); |
d28bb90d |
502 | |
52416317 |
503 | next unless $source_alias; |
504 | |
505 | my $rsrc = $alias2src->{$source_alias} |
506 | or next; |
507 | |
508 | $return{$col} = { |
6395604e |
509 | %{ |
510 | ( $colinfos->{$source_alias} ||= $rsrc->columns_info )->{$colname} |
511 | || |
512 | $self->throw_exception( |
513 | "No such column '$colname' on source " . $rsrc->source_name |
514 | ); |
515 | }, |
d28bb90d |
516 | -result_source => $rsrc, |
52416317 |
517 | -source_alias => $source_alias, |
d28bb90d |
518 | }; |
519 | } |
520 | |
521 | return \%return; |
522 | } |
523 | |
289ac713 |
524 | # The DBIC relationship chaining implementation is pretty simple - every |
525 | # new related_relationship is pushed onto the {from} stack, and the {select} |
526 | # window simply slides further in. This means that when we count somewhere |
527 | # in the middle, we got to make sure that everything in the join chain is an |
528 | # actual inner join, otherwise the count will come back with unpredictable |
529 | # results (a resultset may be generated with _some_ rows regardless of if |
530 | # the relation which the $rs currently selects has rows or not). E.g. |
531 | # $artist_rs->cds->count - normally generates: |
532 | # SELECT COUNT( * ) FROM artist me LEFT JOIN cd cds ON cds.artist = me.artistid |
533 | # which actually returns the number of artists * (number of cds || 1) |
534 | # |
535 | # So what we do here is crawl {from}, determine if the current alias is at |
536 | # the top of the stack, and if not - make sure the chain is inner-joined down |
537 | # to the root. |
538 | # |
31a8aaaf |
539 | sub _inner_join_to_node { |
289ac713 |
540 | my ($self, $from, $alias) = @_; |
541 | |
542 | # subqueries and other oddness are naturally not supported |
543 | return $from if ( |
544 | ref $from ne 'ARRAY' |
545 | || |
546 | @$from <= 1 |
547 | || |
548 | ref $from->[0] ne 'HASH' |
549 | || |
550 | ! $from->[0]{-alias} |
551 | || |
7eb76996 |
552 | $from->[0]{-alias} eq $alias # this last bit means $alias is the head of $from - nothing to do |
289ac713 |
553 | ); |
554 | |
555 | # find the current $alias in the $from structure |
556 | my $switch_branch; |
557 | JOINSCAN: |
558 | for my $j (@{$from}[1 .. $#$from]) { |
559 | if ($j->[0]{-alias} eq $alias) { |
560 | $switch_branch = $j->[0]{-join_path}; |
561 | last JOINSCAN; |
562 | } |
563 | } |
564 | |
7eb76996 |
565 | # something else went quite wrong |
289ac713 |
566 | return $from unless $switch_branch; |
567 | |
568 | # So it looks like we will have to switch some stuff around. |
569 | # local() is useless here as we will be leaving the scope |
570 | # anyway, and deep cloning is just too fucking expensive |
7eb76996 |
571 | # So replace the first hashref in the node arrayref manually |
289ac713 |
572 | my @new_from = ($from->[0]); |
faeb2407 |
573 | my $sw_idx = { map { (values %$_), 1 } @$switch_branch }; #there's one k/v per join-path |
289ac713 |
574 | |
575 | for my $j (@{$from}[1 .. $#$from]) { |
576 | my $jalias = $j->[0]{-alias}; |
577 | |
578 | if ($sw_idx->{$jalias}) { |
579 | my %attrs = %{$j->[0]}; |
580 | delete $attrs{-join_type}; |
581 | push @new_from, [ |
582 | \%attrs, |
583 | @{$j}[ 1 .. $#$j ], |
584 | ]; |
585 | } |
586 | else { |
587 | push @new_from, $j; |
588 | } |
589 | } |
590 | |
591 | return \@new_from; |
592 | } |
593 | |
bac358c9 |
594 | sub _extract_order_criteria { |
1a736efb |
595 | my ($self, $order_by, $sql_maker) = @_; |
c0748280 |
596 | |
1a736efb |
597 | my $parser = sub { |
598 | my ($sql_maker, $order_by) = @_; |
c0748280 |
599 | |
1a736efb |
600 | return scalar $sql_maker->_order_by_chunks ($order_by) |
601 | unless wantarray; |
c0748280 |
602 | |
1a736efb |
603 | my @chunks; |
bac358c9 |
604 | for ($sql_maker->_order_by_chunks ($order_by) ) { |
605 | my $chunk = ref $_ ? $_ : [ $_ ]; |
606 | $chunk->[0] =~ s/\s+ (?: ASC|DESC ) \s* $//ix; |
1a736efb |
607 | push @chunks, $chunk; |
608 | } |
609 | |
610 | return @chunks; |
611 | }; |
612 | |
613 | if ($sql_maker) { |
614 | return $parser->($sql_maker, $order_by); |
615 | } |
616 | else { |
617 | $sql_maker = $self->sql_maker; |
618 | local $sql_maker->{quote_char}; |
619 | return $parser->($sql_maker, $order_by); |
620 | } |
c0748280 |
621 | } |
bac6c4fb |
622 | |
d28bb90d |
623 | 1; |