X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=t%2Fresultset%2Frowparser_internals.t;h=146c036a08008ef6978eb9890b074206ff28a765;hb=5e6d06f41642ba24ec94fd9eff7d373fefe24f76;hp=a89897bd6772fd40405d16e988beb2d6c2cd4223;hpb=a0726a33e1c8a66e531a021ffcc2b208afe2a3c8;p=dbsrgits%2FDBIx-Class.git

diff --git a/t/resultset/rowparser_internals.t b/t/resultset/rowparser_internals.t
index a89897b..146c036 100644
--- a/t/resultset/rowparser_internals.t
+++ b/t/resultset/rowparser_internals.t
@@ -15,7 +15,10 @@ use Data::Dumper;
 $Data::Dumper::Sortkeys = 1;
 
 my $schema = DBICTest->init_schema(no_deploy => 1);
-my $infmap = [qw/single_track.cd.artist.name year/];
+my $infmap = [qw/
+  single_track.cd.artist.name
+  year
+/];
 
 is_same_src (
   $schema->source ('CD')->_mk_row_parser({
@@ -23,15 +26,26 @@ is_same_src (
   }),
   '$_ = [
     { year => $_->[1] },
-    { single_track => [
-      undef,
-      { cd => [
+    { single_track => ( ! defined( $_->[0]) )
+      ? bless( [
+        undef,
+        { cd => [
+          undef,
+          { artist => [
+            { name  => $_->[0] },
+          ] },
+        ] },
+      ], __NBC__ )
+      : [
         undef,
-        { artist => [
-          { name  => $_->[0] },
+        { cd => [
+          undef,
+          { artist => [
+            { name  => $_->[0] },
+          ] },
         ] },
-      ]},
-    ]},
+      ]
+    },
   ] for @{$_[0]}',
   'Simple 1:1 descending non-collapsing parser',
 );
@@ -44,31 +58,156 @@ $infmap = [qw/
   title
   artist
 /];
+
 is_same_src (
   $schema->source ('CD')->_mk_row_parser({
     inflate_map => $infmap,
   }),
   '$_ = [
     { artist => $_->[5], title => $_->[4], year => $_->[2] },
-    { single_track => [
-      undef,
-      { cd => [
-        undef,
-        { artist => [
-          { artistid => $_->[1] },
-          { cds => [
-            { cdid => $_->[3] },
-            { tracks => [
-              { title => $_->[0] }
-            ] },
-          ] },
-        ] },
-      ] },
-    ] },
+    {
+      single_track => ( (! defined $_->[0] ) && (! defined $_->[1]) && (! defined $_->[3] ) )
+        ? bless( [
+          undef,
+          {
+            cd => [
+              undef,
+              {
+                artist => [
+                  { artistid => $_->[1] },
+                  {
+                    cds => ( (! defined $_->[0] ) && ( ! defined $_->[3] ) )
+                      ? bless ([
+                        { cdid => $_->[3] },
+                        {
+                          tracks => ( ! defined $_->[0] )
+                            ? bless ( [{ title => $_->[0] }], __NBC__ )
+                            : [{ title => $_->[0] }]
+                        }
+                      ], __NBC__)
+                      : [
+                        { cdid => $_->[3] },
+                        {
+                          tracks => ( ! defined $_->[0] )
+                            ? bless ( [{ title => $_->[0] }], __NBC__ )
+                            : [{ title => $_->[0] }]
+                        }
+                      ]
+                  }
+                ]
+              }
+            ]
+          }
+        ], __NBC__)
+        : [
+          undef,
+          {
+            cd => [
+              undef,
+              {
+                artist => [
+                  { artistid => $_->[1] },
+                  {
+                    cds => ( (! defined $_->[0] ) && ( ! defined $_->[3] ) )
+                      ? bless ([
+                        { cdid => $_->[3] },
+                        {
+                          tracks => ( ! defined $_->[0] )
+                            ? bless ( [{ title => $_->[0] }], __NBC__ )
+                            : [{ title => $_->[0] }]
+                        }
+                      ], __NBC__)
+                      : [
+                        { cdid => $_->[3] },
+                        {
+                          tracks => ( ! defined $_->[0] )
+                            ? bless ( [{ title => $_->[0] }], __NBC__ )
+                            : [{ title => $_->[0] }]
+                        }
+                      ]
+                  }
+                ]
+              }
+            ]
+          }
+        ]
+    }
   ] for @{$_[0]}',
   '1:1 descending non-collapsing parser terminating with chained 1:M:M',
 );
 
+is_same_src (
+  $schema->source ('CD')->_mk_row_parser({
+    prune_null_branches => 1,
+    inflate_map => $infmap,
+  }),
+  '$_ = [
+    { artist => $_->[5], title => $_->[4], year => $_->[2] },
+    {
+      single_track => ( (! defined $_->[0] ) && (! defined $_->[1]) && (! defined $_->[3] ) ) ? undef : [
+        undef,
+        {
+          cd => [
+            undef,
+            {
+              artist => [
+                { artistid => $_->[1] },
+                {
+                  cds => ( (! defined $_->[0] ) && ( ! defined $_->[3] ) ) ? undef : [
+                    { cdid => $_->[3] },
+                    {
+                      tracks => ( ! defined $_->[0] ) ? undef : [
+                        { title => $_->[0] },
+                      ]
+                    }
+                  ]
+                }
+              ]
+            }
+          ]
+        }
+      ]
+    }
+  ] for @{$_[0]}',
+  '1:1 descending non-collapsing pruning parser terminating with chained 1:M:M',
+);
+
+is_same_src (
+  $schema->source ('CD')->_mk_row_parser({
+    hri_style => 1,
+    prune_null_branches => 1,
+    inflate_map => $infmap,
+  }),
+  '$_ = {
+      artist => $_->[5], title => $_->[4], year => $_->[2],
+
+      ( single_track => ( (! defined $_->[0] ) && (! defined $_->[1]) && (! defined $_->[3] ) )
+        ? undef
+        : {
+            cd =>
+              {
+                artist => {
+                    artistid => $_->[1],
+                    ( cds => ( (! defined $_->[0] ) && ( ! defined $_->[3] ) )
+                      ? undef
+                      : {
+                          cdid => $_->[3],
+                          ( tracks => ( ! defined $_->[0] )
+                            ? undef
+                            : { title => $_->[0] }
+                          )
+                        }
+                    )
+                  }
+              }
+          }
+      )
+    } for @{$_[0]}',
+  '1:1 descending non-collapsing HRI-direct parser terminating with chained 1:M:M',
+);
+
+
+
 is_deeply (
   ($schema->source('CD')->_resolve_collapse({ as => {map { $infmap->[$_] => $_ } 0 .. $#$infmap} })),
   {
@@ -108,49 +247,117 @@ is_same_src (
     inflate_map => $infmap,
     collapse => 1,
   }),
-  ' my($rows_pos, $result_pos, $cur_row_data, %cur_row_ids, @collapse_idx, $is_new_res) = (0, 0);
+  ' my $rows_pos = 0;
+    my ($result_pos, @collapse_idx, $cur_row_data, %cur_row_ids);
 
     while ($cur_row_data = (
-      ( $rows_pos >= 0 and $_[0][$rows_pos++] ) or do { $rows_pos = -1; undef } )
+      ( $rows_pos >= 0 and $_[0][$rows_pos++] )
         ||
-      ( $_[1] and $_[1]->() )
-    ) {
+      ( $_[1] and $rows_pos = -1 and $_[1]->() )
+    ) ) {
 
-      $cur_row_ids{$_} = defined $cur_row_data->[$_] ? $cur_row_data->[$_] : "\0NULL\xFF$rows_pos\xFF$_\0"
-        for (0, 1, 3, 4, 5);
+      $cur_row_ids{0} = defined $cur_row_data->[0] ? $cur_row_data->[0] : "\0NULL\xFF$rows_pos\xFF0\0";
+      $cur_row_ids{1} = defined $cur_row_data->[1] ? $cur_row_data->[1] : "\0NULL\xFF$rows_pos\xFF1\0";
+      $cur_row_ids{3} = defined $cur_row_data->[3] ? $cur_row_data->[3] : "\0NULL\xFF$rows_pos\xFF3\0";
+      $cur_row_ids{4} = defined $cur_row_data->[4] ? $cur_row_data->[4] : "\0NULL\xFF$rows_pos\xFF4\0";
+      $cur_row_ids{5} = defined $cur_row_data->[5] ? $cur_row_data->[5] : "\0NULL\xFF$rows_pos\xFF5\0";
 
       # a present cref in $_[1] implies lazy prefetch, implies a supplied stash in $_[2]
-      $_[1] and $result_pos and unshift(@{$_[2]}, $cur_row_data) and last
-        if ( $is_new_res = ! $collapse_idx[0]{$cur_row_ids{4}}{$cur_row_ids{5}} );
+      $_[1] and $result_pos and ! $collapse_idx[0]{$cur_row_ids{4}}{$cur_row_ids{5}} and (unshift @{$_[2]}, $cur_row_data) and last;
 
       # the rowdata itself for root node
-      $collapse_idx[0]{$cur_row_ids{4}}{$cur_row_ids{5}} ||= [{ artist => $cur_row_data->[5], title => $cur_row_data->[4], year => $cur_row_data->[2] }];
+      $collapse_idx[0]{$cur_row_ids{4}}{$cur_row_ids{5}} ||= $_[0][$result_pos++] = [{ artist => $cur_row_data->[5], title => $cur_row_data->[4], year => $cur_row_data->[2] }];
 
       # prefetch data of single_track (placed in root)
-      $collapse_idx[0]{$cur_row_ids{4}}{$cur_row_ids{5}}[1]{single_track} ||= $collapse_idx[1]{$cur_row_ids{1}}{$cur_row_ids{4}}{$cur_row_ids{5}};
+      $collapse_idx[0]{$cur_row_ids{4}}{$cur_row_ids{5}}[1]{single_track} ||= $collapse_idx[1]{$cur_row_ids{1}}{$cur_row_ids{4}}{$cur_row_ids{5}} = [];
+      defined($cur_row_data->[1]) or bless( $collapse_idx[0]{$cur_row_ids{4}}{$cur_row_ids{5}}[1]{single_track}, __NBC__ );
 
       # prefetch data of cd (placed in single_track)
-      $collapse_idx[1]{$cur_row_ids{1}}{$cur_row_ids{4}}{$cur_row_ids{5}}[1]{cd} ||= $collapse_idx[2]{$cur_row_ids{1}}{$cur_row_ids{4}}{$cur_row_ids{5}};
+      $collapse_idx[1]{$cur_row_ids{1}}{$cur_row_ids{4}}{$cur_row_ids{5}}[1]{cd} ||= $collapse_idx[2]{$cur_row_ids{1}}{$cur_row_ids{4}}{$cur_row_ids{5}} = [];
 
       # prefetch data of artist ( placed in single_track->cd)
-      $collapse_idx[2]{$cur_row_ids{1}}{$cur_row_ids{4}}{$cur_row_ids{5}}[1]{artist} ||= $collapse_idx[3]{$cur_row_ids{1}}{$cur_row_ids{4}}{$cur_row_ids{5}} ||= [{ artistid => $cur_row_data->[1] }];
+      $collapse_idx[2]{$cur_row_ids{1}}{$cur_row_ids{4}}{$cur_row_ids{5}}[1]{artist} ||= $collapse_idx[3]{$cur_row_ids{1}}{$cur_row_ids{4}}{$cur_row_ids{5}} = [{ artistid => $cur_row_data->[1] }];
 
       # prefetch data of cds (if available)
-      push @{$collapse_idx[3]{$cur_row_ids{1}}{$cur_row_ids{4}}{$cur_row_ids{5}}[1]{cds}}, $collapse_idx[4]{$cur_row_ids{1}}{$cur_row_ids{3}}{$cur_row_ids{4}}{$cur_row_ids{5}} ||= [{ cdid => $cur_row_data->[3] }]
-        unless $collapse_idx[4]{$cur_row_ids{1}}{$cur_row_ids{3}}{$cur_row_ids{4}}{$cur_row_ids{5}};
+      (! $collapse_idx[4]{$cur_row_ids{1}}{$cur_row_ids{3}}{$cur_row_ids{4}}{$cur_row_ids{5}} )
+        and
+      push @{$collapse_idx[3]{$cur_row_ids{1}}{$cur_row_ids{4}}{$cur_row_ids{5}}[1]{cds}}, (
+        $collapse_idx[4]{$cur_row_ids{1}}{$cur_row_ids{3}}{$cur_row_ids{4}}{$cur_row_ids{5}} = [{ cdid => $cur_row_data->[3] }]
+      );
+      defined($cur_row_data->[3]) or bless( $collapse_idx[3]{$cur_row_ids{1}}{$cur_row_ids{4}}{$cur_row_ids{5}}[1]{cds}, __NBC__ );
 
       # prefetch data of tracks (if available)
-      push @{$collapse_idx[4]{$cur_row_ids{1}}{$cur_row_ids{3}}{$cur_row_ids{4}}{$cur_row_ids{5}}[1]{tracks}}, $collapse_idx[5]{$cur_row_ids{0}}{$cur_row_ids{1}}{$cur_row_ids{3}}{$cur_row_ids{4}}{$cur_row_ids{5}} ||= [{ title => $cur_row_data->[0] }]
-        unless $collapse_idx[5]{$cur_row_ids{0}}{$cur_row_ids{1}}{$cur_row_ids{3}}{$cur_row_ids{4}}{$cur_row_ids{5}};
+      (! $collapse_idx[5]{$cur_row_ids{0}}{$cur_row_ids{1}}{$cur_row_ids{3}}{$cur_row_ids{4}}{$cur_row_ids{5}} )
+        and
+      push @{$collapse_idx[4]{$cur_row_ids{1}}{$cur_row_ids{3}}{$cur_row_ids{4}}{$cur_row_ids{5}}[1]{tracks}}, (
+        $collapse_idx[5]{$cur_row_ids{0}}{$cur_row_ids{1}}{$cur_row_ids{3}}{$cur_row_ids{4}}{$cur_row_ids{5}} = [{ title => $cur_row_data->[0] }]
+      );
+      defined($cur_row_data->[0]) or bless( $collapse_idx[4]{$cur_row_ids{1}}{$cur_row_ids{3}}{$cur_row_ids{4}}{$cur_row_ids{5}}[1]{tracks}, __NBC__ );
 
-      $_[0][$result_pos++] = $collapse_idx[0]{$cur_row_ids{4}}{$cur_row_ids{5}}
-        if $is_new_res;
     }
-    splice @{$_[0]}, $result_pos;
+    $#{$_[0]} = $result_pos - 1;
   ',
   'Same 1:1 descending terminating with chained 1:M:M but with collapse',
 );
 
+is_same_src (
+  $schema->source ('CD')->_mk_row_parser({
+    inflate_map => $infmap,
+    collapse => 1,
+    hri_style => 1,
+    prune_null_branches => 1,
+  }),
+  ' my $rows_pos = 0;
+    my ($result_pos, @collapse_idx, $cur_row_data);
+
+    while ($cur_row_data = (
+      ( $rows_pos >= 0 and $_[0][$rows_pos++] )
+        ||
+      ( $_[1] and $rows_pos = -1 and $_[1]->() )
+    ) ) {
+
+      # a present cref in $_[1] implies lazy prefetch, implies a supplied stash in $_[2]
+      $_[1] and $result_pos and ! $collapse_idx[0]{$cur_row_data->[4]}{$cur_row_data->[5]} and (unshift @{$_[2]}, $cur_row_data) and last;
+
+      # the rowdata itself for root node
+      $collapse_idx[0]{$cur_row_data->[4]}{$cur_row_data->[5]} ||= $_[0][$result_pos++] = { artist => $cur_row_data->[5], title => $cur_row_data->[4], year => $cur_row_data->[2] };
+
+      # prefetch data of single_track (placed in root)
+      (! defined($cur_row_data->[1]) ) ? $collapse_idx[0]{$cur_row_data->[4]}{$cur_row_data->[5]}{single_track} = undef : do {
+        $collapse_idx[0]{$cur_row_data->[4]}{$cur_row_data->[5]}{single_track} ||= $collapse_idx[1]{$cur_row_data->[1]}{$cur_row_data->[4]}{$cur_row_data->[5]};
+
+        # prefetch data of cd (placed in single_track)
+        $collapse_idx[1]{$cur_row_data->[1]}{$cur_row_data->[4]}{$cur_row_data->[5]}{cd} ||= $collapse_idx[2]{$cur_row_data->[1]}{$cur_row_data->[4]}{$cur_row_data->[5]};
+
+        # prefetch data of artist ( placed in single_track->cd)
+        $collapse_idx[2]{$cur_row_data->[1]}{$cur_row_data->[4]}{$cur_row_data->[5]}{artist} ||= $collapse_idx[3]{$cur_row_data->[1]}{$cur_row_data->[4]}{$cur_row_data->[5]} = { artistid => $cur_row_data->[1] };
+
+        # prefetch data of cds (if available)
+        (! defined $cur_row_data->[3] ) ? $collapse_idx[3]{$cur_row_data->[1]}{$cur_row_data->[4]}{$cur_row_data->[5]}{cds} = [] : do {
+
+          (! $collapse_idx[4]{$cur_row_data->[1]}{$cur_row_data->[3]}{$cur_row_data->[4]}{$cur_row_data->[5]} )
+            and
+          push @{$collapse_idx[3]{$cur_row_data->[1]}{$cur_row_data->[4]}{$cur_row_data->[5]}{cds}}, (
+            $collapse_idx[4]{$cur_row_data->[1]}{$cur_row_data->[3]}{$cur_row_data->[4]}{$cur_row_data->[5]} = { cdid => $cur_row_data->[3] }
+          );
+
+          # prefetch data of tracks (if available)
+          ( ! defined $cur_row_data->[0] ) ? $collapse_idx[4]{$cur_row_data->[1]}{$cur_row_data->[3]}{$cur_row_data->[4]}{$cur_row_data->[5]}{tracks} = [] : do {
+
+            (! $collapse_idx[5]{$cur_row_data->[0]}{$cur_row_data->[1]}{$cur_row_data->[3]}{$cur_row_data->[4]}{$cur_row_data->[5]} )
+              and
+            push @{$collapse_idx[4]{$cur_row_data->[1]}{$cur_row_data->[3]}{$cur_row_data->[4]}{$cur_row_data->[5]}{tracks}}, (
+              $collapse_idx[5]{$cur_row_data->[0]}{$cur_row_data->[1]}{$cur_row_data->[3]}{$cur_row_data->[4]}{$cur_row_data->[5]} = { title => $cur_row_data->[0] }
+            );
+          };
+        };
+      };
+    }
+    $#{$_[0]} = $result_pos - 1;
+  ',
+  'Same 1:1 descending terminating with chained 1:M:M but with collapse, HRI-direct',
+);
+
 $infmap = [qw/
   tracks.lyrics.existing_lyric_versions.text
   existing_single_track.cd.artist.artistid
@@ -217,50 +424,134 @@ is_same_src (
     inflate_map => $infmap,
     collapse => 1,
   }),
-  ' my ($rows_pos, $result_pos, $cur_row_data, %cur_row_ids, @collapse_idx, $is_new_res) = (0,0);
+  ' my $rows_pos = 0;
+    my ($result_pos, @collapse_idx, $cur_row_data, %cur_row_ids);
 
     while ($cur_row_data = (
-      ( $rows_pos >= 0 and $_[0][$rows_pos++] ) or do { $rows_pos = -1; undef } )
+      ( $rows_pos >= 0 and $_[0][$rows_pos++] )
         ||
-      ( $_[1] and $_[1]->() )
-    ) {
+      ( $_[1] and $rows_pos = -1 and $_[1]->() )
+    ) ) {
 
-      $cur_row_ids{$_} = defined $cur_row_data->[$_] ? $cur_row_data->[$_] : "\0NULL\xFF$rows_pos\xFF$_\0"
-        for (0, 1, 5, 6, 8, 10);
+      $cur_row_ids{0} = defined $cur_row_data->[0] ? $cur_row_data->[0] : "\0NULL\xFF$rows_pos\xFF0\0";
+      $cur_row_ids{1} = defined $cur_row_data->[1] ? $cur_row_data->[1] : "\0NULL\xFF$rows_pos\xFF1\0";
+      $cur_row_ids{5} = defined $cur_row_data->[5] ? $cur_row_data->[5] : "\0NULL\xFF$rows_pos\xFF5\0";
+      $cur_row_ids{6} = defined $cur_row_data->[6] ? $cur_row_data->[6] : "\0NULL\xFF$rows_pos\xFF6\0";
+      $cur_row_ids{8} = defined $cur_row_data->[8] ? $cur_row_data->[8] : "\0NULL\xFF$rows_pos\xFF8\0";
+      $cur_row_ids{10} = defined $cur_row_data->[10] ? $cur_row_data->[10] : "\0NULL\xFF$rows_pos\xFF10\0";
 
       # a present cref in $_[1] implies lazy prefetch, implies a supplied stash in $_[2]
-      $_[1] and $result_pos and unshift(@{$_[2]}, $cur_row_data) and last
-        if ( $is_new_res = ! $collapse_idx[0]{$cur_row_ids{1}} );
-
-      $collapse_idx[0]{$cur_row_ids{1}} ||= [{ genreid => $cur_row_data->[4], latest_cd => $cur_row_data->[7], year => $cur_row_data->[3] }];
+      $_[1] and $result_pos and ! $collapse_idx[0]{$cur_row_ids{1}} and (unshift @{$_[2]}, $cur_row_data) and last;
 
-      $collapse_idx[0]{$cur_row_ids{1}}[1]{existing_single_track} ||= $collapse_idx[1]{$cur_row_ids{1}};
-      $collapse_idx[1]{$cur_row_ids{1}}[1]{cd} ||= $collapse_idx[2]{$cur_row_ids{1}};
-      $collapse_idx[2]{$cur_row_ids{1}}[1]{artist} ||= $collapse_idx[3]{$cur_row_ids{1}} ||= [{ artistid => $cur_row_data->[1] }];
+      $collapse_idx[0]{$cur_row_ids{1}} ||= $_[0][$result_pos++] = [{ genreid => $cur_row_data->[4], latest_cd => $cur_row_data->[7], year => $cur_row_data->[3] }];
 
-      push @{ $collapse_idx[3]{$cur_row_ids{1}}[1]{cds} }, $collapse_idx[4]{$cur_row_ids{1}}{$cur_row_ids{6}} ||= [{ cdid => $cur_row_data->[6], genreid => $cur_row_data->[9], year => $cur_row_data->[2] }]
-        unless $collapse_idx[4]{$cur_row_ids{1}}{$cur_row_ids{6}};
+      $collapse_idx[0]{$cur_row_ids{1}}[1]{existing_single_track} ||= $collapse_idx[1]{$cur_row_ids{1}} = [];
+      $collapse_idx[1]{$cur_row_ids{1}}[1]{cd} ||= $collapse_idx[2]{$cur_row_ids{1}} = [];
+      $collapse_idx[2]{$cur_row_ids{1}}[1]{artist} ||= $collapse_idx[3]{$cur_row_ids{1}} = [{ artistid => $cur_row_data->[1] }];
 
-      push @{ $collapse_idx[4]{$cur_row_ids{1}}{$cur_row_ids{6}}[1]{tracks} }, $collapse_idx[5]{$cur_row_ids{1}}{$cur_row_ids{6}}{$cur_row_ids{8}} ||= [{ title => $cur_row_data->[8] }]
-        unless $collapse_idx[5]{$cur_row_ids{1}}{$cur_row_ids{6}}{$cur_row_ids{8}};
+      (! $collapse_idx[4]{$cur_row_ids{1}}{$cur_row_ids{6}} )
+        and
+      push @{ $collapse_idx[3]{$cur_row_ids{1}}[1]{cds} }, (
+        $collapse_idx[4]{$cur_row_ids{1}}{$cur_row_ids{6}} = [{ cdid => $cur_row_data->[6], genreid => $cur_row_data->[9], year => $cur_row_data->[2] }]
+      );
+      defined($cur_row_data->[6]) or bless( $collapse_idx[3]{$cur_row_ids{1}}[1]{cds}, __NBC__ );
 
-      push @{ $collapse_idx[0]{$cur_row_ids{1}}[1]{tracks} }, $collapse_idx[6]{$cur_row_ids{1}}{$cur_row_ids{5}} ||= [{ title => $cur_row_data->[5] }]
-        unless $collapse_idx[6]{$cur_row_ids{1}}{$cur_row_ids{5}};
+      (! $collapse_idx[5]{$cur_row_ids{1}}{$cur_row_ids{6}}{$cur_row_ids{8}} )
+        and
+      push @{ $collapse_idx[4]{$cur_row_ids{1}}{$cur_row_ids{6}}[1]{tracks} }, (
+        $collapse_idx[5]{$cur_row_ids{1}}{$cur_row_ids{6}}{$cur_row_ids{8}} = [{ title => $cur_row_data->[8] }]
+      );
+      defined($cur_row_data->[8]) or bless( $collapse_idx[4]{$cur_row_ids{1}}{$cur_row_ids{6}}[1]{tracks}, __NBC__ );
 
-      $collapse_idx[6]{$cur_row_ids{1}}{$cur_row_ids{5}}[1]{lyrics} ||= $collapse_idx[7]{$cur_row_ids{1}}{$cur_row_ids{5}}{$cur_row_ids{10}};
+      (! $collapse_idx[6]{$cur_row_ids{1}}{$cur_row_ids{5}} )
+        and
+      push @{ $collapse_idx[0]{$cur_row_ids{1}}[1]{tracks} }, (
+        $collapse_idx[6]{$cur_row_ids{1}}{$cur_row_ids{5}} = [{ title => $cur_row_data->[5] }]
+      );
+      defined($cur_row_data->[5]) or bless( $collapse_idx[0]{$cur_row_ids{1}}[1]{tracks}, __NBC__ );
 
-      push @{ $collapse_idx[7]{$cur_row_ids{1}}{$cur_row_ids{5}}{$cur_row_ids{10}}[1]{existing_lyric_versions} }, $collapse_idx[8]{$cur_row_ids{0}}{$cur_row_ids{1}}{$cur_row_ids{5}}{$cur_row_ids{10}} ||= [{ lyric_id => $cur_row_data->[10], text => $cur_row_data->[0] }]
-        unless $collapse_idx[8]{$cur_row_ids{0}}{$cur_row_ids{1}}{$cur_row_ids{5}}{$cur_row_ids{10}};
+      $collapse_idx[6]{$cur_row_ids{1}}{$cur_row_ids{5}}[1]{lyrics} ||= $collapse_idx[7]{$cur_row_ids{1}}{$cur_row_ids{5}}{$cur_row_ids{10}} = [];
+      defined($cur_row_data->[10]) or bless( $collapse_idx[6]{$cur_row_ids{1}}{$cur_row_ids{5}}[1]{lyrics}, __NBC__ );
 
-      $_[0][$result_pos++] = $collapse_idx[0]{$cur_row_ids{1}}
-        if $is_new_res;
+      (! $collapse_idx[8]{$cur_row_ids{0}}{$cur_row_ids{1}}{$cur_row_ids{5}}{$cur_row_ids{10}} )
+        and
+      push @{ $collapse_idx[7]{$cur_row_ids{1}}{$cur_row_ids{5}}{$cur_row_ids{10}}[1]{existing_lyric_versions} }, (
+        $collapse_idx[8]{$cur_row_ids{0}}{$cur_row_ids{1}}{$cur_row_ids{5}}{$cur_row_ids{10}} = [{ lyric_id => $cur_row_data->[10], text => $cur_row_data->[0] }]
+      );
     }
 
-    splice @{$_[0]}, $result_pos;
+    $#{$_[0]} = $result_pos - 1;
   ',
   'Multiple has_many on multiple branches torture test',
 );
 
+is_same_src (
+  $schema->source ('CD')->_mk_row_parser({
+    inflate_map => $infmap,
+    collapse => 1,
+    prune_null_branches => 1,
+  }),
+  ' my $rows_pos = 0;
+    my ($result_pos, @collapse_idx, $cur_row_data);
+
+    while ($cur_row_data = (
+      ( $rows_pos >= 0 and $_[0][$rows_pos++] )
+        ||
+      ( $_[1] and $rows_pos = -1 and $_[1]->() )
+    ) ) {
+
+      # a present cref in $_[1] implies lazy prefetch, implies a supplied stash in $_[2]
+      $_[1] and $result_pos and ! $collapse_idx[0]{$cur_row_data->[1]} and (unshift @{$_[2]}, $cur_row_data) and last;
+
+      $collapse_idx[0]{$cur_row_data->[1]} ||= $_[0][$result_pos++] = [{ genreid => $cur_row_data->[4], latest_cd => $cur_row_data->[7], year => $cur_row_data->[3] }];
+
+      $collapse_idx[0]{$cur_row_data->[1]}[1]{existing_single_track} ||= $collapse_idx[1]{$cur_row_data->[1]} = [];
+      $collapse_idx[1]{$cur_row_data->[1]}[1]{cd} ||= $collapse_idx[2]{$cur_row_data->[1]} = [];
+      $collapse_idx[2]{$cur_row_data->[1]}[1]{artist} ||= $collapse_idx[3]{$cur_row_data->[1]} = [{ artistid => $cur_row_data->[1] }];
+
+      (! defined($cur_row_data->[6])) ? $collapse_idx[3]{$cur_row_data->[1]}[1]{cds} = [] : do {
+        (! $collapse_idx[4]{$cur_row_data->[1]}{$cur_row_data->[6]} )
+          and
+        push @{ $collapse_idx[3]{$cur_row_data->[1]}[1]{cds} }, (
+          $collapse_idx[4]{$cur_row_data->[1]}{$cur_row_data->[6]} = [{ cdid => $cur_row_data->[6], genreid => $cur_row_data->[9], year => $cur_row_data->[2] }]
+        );
+
+        (! defined($cur_row_data->[8]) ) ? $collapse_idx[4]{$cur_row_data->[1]}{$cur_row_data->[6]}[1]{tracks} = [] : do {
+
+          (! $collapse_idx[5]{$cur_row_data->[1]}{$cur_row_data->[6]}{$cur_row_data->[8]} )
+            and
+          push @{ $collapse_idx[4]{$cur_row_data->[1]}{$cur_row_data->[6]}[1]{tracks} }, (
+            $collapse_idx[5]{$cur_row_data->[1]}{$cur_row_data->[6]}{$cur_row_data->[8]} = [{ title => $cur_row_data->[8] }]
+          );
+        };
+      };
+
+      (! defined($cur_row_data->[5]) ) ? $collapse_idx[0]{$cur_row_data->[1]}[1]{tracks} = [] : do {
+
+        (! $collapse_idx[6]{$cur_row_data->[1]}{$cur_row_data->[5]} )
+          and
+        push @{ $collapse_idx[0]{$cur_row_data->[1]}[1]{tracks} }, (
+          $collapse_idx[6]{$cur_row_data->[1]}{$cur_row_data->[5]} = [{ title => $cur_row_data->[5] }]
+        );
+
+        (! defined($cur_row_data->[10]) ) ? $collapse_idx[6]{$cur_row_data->[1]}{$cur_row_data->[5]}[1]{lyrics} = [] : do {
+
+          $collapse_idx[6]{$cur_row_data->[1]}{$cur_row_data->[5]}[1]{lyrics} ||= $collapse_idx[7]{$cur_row_data->[1]}{$cur_row_data->[5]}{$cur_row_data->[10]} = [];
+
+          (! $collapse_idx[8]{$cur_row_data->[0]}{$cur_row_data->[1]}{$cur_row_data->[5]}{$cur_row_data->[10]} )
+            and
+          push @{ $collapse_idx[7]{$cur_row_data->[1]}{$cur_row_data->[5]}{$cur_row_data->[10]}[1]{existing_lyric_versions} }, (
+            $collapse_idx[8]{$cur_row_data->[0]}{$cur_row_data->[1]}{$cur_row_data->[5]}{$cur_row_data->[10]} = [{ lyric_id => $cur_row_data->[10], text => $cur_row_data->[0] }]
+          );
+        };
+      };
+    }
+
+    $#{$_[0]} = $result_pos - 1;
+  ',
+  'Multiple has_many on multiple branches with branch pruning torture test',
+);
+
 $infmap = [
   'single_track.trackid',                   # (0) definitive link to root from 1:1:1:1:M:M chain
   'year',                                   # (1) non-unique
@@ -314,16 +605,20 @@ is_same_src (
     inflate_map => $infmap,
     collapse => 1,
   }),
-  ' my($rows_pos, $result_pos, $cur_row_data, %cur_row_ids, @collapse_idx, $is_new_res) = (0, 0);
+  ' my $rows_pos = 0;
+    my ($result_pos, @collapse_idx, $cur_row_data, %cur_row_ids);
 
     while ($cur_row_data = (
-      ( $rows_pos >= 0 and $_[0][$rows_pos++] ) or do { $rows_pos = -1; undef } )
+      ( $rows_pos >= 0 and $_[0][$rows_pos++] )
         ||
-      ( $_[1] and $_[1]->() )
-    ) {
+      ( $_[1] and $rows_pos = -1 and $_[1]->() )
+    ) ) {
 
-      $cur_row_ids{$_} = defined $$cur_row_data[$_] ? $$cur_row_data[$_] : "\0NULL\xFF$rows_pos\xFF$_\0"
-        for (0, 2, 3, 4, 8);
+      $cur_row_ids{0} = defined $cur_row_data->[0] ? $cur_row_data->[0] : "\0NULL\xFF$rows_pos\xFF0\0";
+      $cur_row_ids{2} = defined $cur_row_data->[2] ? $cur_row_data->[2] : "\0NULL\xFF$rows_pos\xFF2\0";
+      $cur_row_ids{3} = defined $cur_row_data->[3] ? $cur_row_data->[3] : "\0NULL\xFF$rows_pos\xFF3\0";
+      $cur_row_ids{4} = defined $cur_row_data->[4] ? $cur_row_data->[4] : "\0NULL\xFF$rows_pos\xFF4\0";
+      $cur_row_ids{8} = defined $cur_row_data->[8] ? $cur_row_data->[8] : "\0NULL\xFF$rows_pos\xFF8\0";
 
       # cache expensive set of ops in a non-existent rowid slot
       $cur_row_ids{10} = (
@@ -335,38 +630,122 @@ is_same_src (
       );
 
       # a present cref in $_[1] implies lazy prefetch, implies a supplied stash in $_[2]
-      $_[1] and $result_pos and unshift(@{$_[2]}, $cur_row_data) and last
-        if ( $is_new_res = ! $collapse_idx[0]{$cur_row_ids{10}} );
-
-      $collapse_idx[0]{$cur_row_ids{10}} ||= [{ year => $$cur_row_data[1] }];
+      $_[1] and $result_pos and ! $collapse_idx[0]{$cur_row_ids{10}} and (unshift @{$_[2]}, $cur_row_data) and last;
 
-      $collapse_idx[0]{$cur_row_ids{10}}[1]{single_track} ||= ($collapse_idx[1]{$cur_row_ids{0}} ||= [{ trackid => $$cur_row_data[0] }]);
+      $collapse_idx[0]{$cur_row_ids{10}} ||= $_[0][$result_pos++] = [{ year => $$cur_row_data[1] }];
 
-      $collapse_idx[1]{$cur_row_ids{0}}[1]{cd} ||= $collapse_idx[2]{$cur_row_ids{0}};
+      $collapse_idx[0]{$cur_row_ids{10}}[1]{single_track} ||= ($collapse_idx[1]{$cur_row_ids{0}} = [{ trackid => $cur_row_data->[0] }]);
+      defined($cur_row_data->[0]) or bless ( $collapse_idx[0]{$cur_row_ids{10}}[1]{single_track}, __NBC__ );
 
-      $collapse_idx[2]{$cur_row_ids{0}}[1]{artist} ||= ($collapse_idx[3]{$cur_row_ids{0}} ||= [{ artistid => $$cur_row_data[6] }]);
+      $collapse_idx[1]{$cur_row_ids{0}}[1]{cd} ||= $collapse_idx[2]{$cur_row_ids{0}} = [];
 
-      push @{$collapse_idx[3]{$cur_row_ids{0}}[1]{cds}},
-          $collapse_idx[4]{$cur_row_ids{0}}{$cur_row_ids{4}} ||= [{ cdid => $$cur_row_data[4], genreid => $$cur_row_data[7], year => $$cur_row_data[5] }]
-        unless $collapse_idx[4]{$cur_row_ids{0}}{$cur_row_ids{4}};
+      $collapse_idx[2]{$cur_row_ids{0}}[1]{artist} ||= ($collapse_idx[3]{$cur_row_ids{0}} = [{ artistid => $cur_row_data->[6] }]);
 
-      push @{$collapse_idx[4]{$cur_row_ids{0}}{$cur_row_ids{4}}[1]{tracks}},
-          $collapse_idx[5]{$cur_row_ids{0}}{$cur_row_ids{4}}{$cur_row_ids{8}} ||= [{ title => $$cur_row_data[8] }]
-        unless $collapse_idx[5]{$cur_row_ids{0}}{$cur_row_ids{4}}{$cur_row_ids{8}};
+      (! $collapse_idx[4]{$cur_row_ids{0}}{$cur_row_ids{4}} )
+        and
+      push @{$collapse_idx[3]{$cur_row_ids{0}}[1]{cds}}, (
+          $collapse_idx[4]{$cur_row_ids{0}}{$cur_row_ids{4}} = [{ cdid => $cur_row_data->[4], genreid => $cur_row_data->[7], year => $cur_row_data->[5] }]
+      );
+      defined($cur_row_data->[4]) or bless ( $collapse_idx[3]{$cur_row_ids{0}}[1]{cds}, __NBC__ );
 
-      push @{$collapse_idx[0]{$cur_row_ids{10}}[1]{tracks}},
-          $collapse_idx[6]{$cur_row_ids{2}}{$cur_row_ids{3}} ||= [{ cd => $$cur_row_data[2], title => $$cur_row_data[3] }]
-        unless $collapse_idx[6]{$cur_row_ids{2}}{$cur_row_ids{3}};
+      (! $collapse_idx[5]{$cur_row_ids{0}}{$cur_row_ids{4}}{$cur_row_ids{8}} )
+        and
+      push @{$collapse_idx[4]{$cur_row_ids{0}}{$cur_row_ids{4}}[1]{tracks}}, (
+          $collapse_idx[5]{$cur_row_ids{0}}{$cur_row_ids{4}}{$cur_row_ids{8}} = [{ title => $cur_row_data->[8] }]
+      );
+      defined($cur_row_data->[8]) or bless ( $collapse_idx[4]{$cur_row_ids{0}}{$cur_row_ids{4}}[1]{tracks}, __NBC__ );
 
-      $_[0][$result_pos++] = $collapse_idx[0]{$cur_row_ids{10}}
-        if $is_new_res;
+      (! $collapse_idx[6]{$cur_row_ids{2}}{$cur_row_ids{3}} )
+        and
+      push @{$collapse_idx[0]{$cur_row_ids{10}}[1]{tracks}}, (
+          $collapse_idx[6]{$cur_row_ids{2}}{$cur_row_ids{3}} = [{ cd => $$cur_row_data[2], title => $cur_row_data->[3] }]
+      );
+      defined($cur_row_data->[2]) or bless ( $collapse_idx[0]{$cur_row_ids{10}}[1]{tracks}, __NBC__ );
     }
 
-    splice @{$_[0]}, $result_pos;
+    $#{$_[0]} = $result_pos - 1;
   ',
   'Multiple has_many on multiple branches with underdefined root torture test',
 );
 
+is_same_src (
+  $schema->source ('CD')->_mk_row_parser({
+    inflate_map => $infmap,
+    collapse => 1,
+    hri_style => 1,
+    prune_null_branches => 1,
+  }),
+  ' my $rows_pos = 0;
+    my ($result_pos, @collapse_idx, $cur_row_data, %cur_row_ids);
+
+    while ($cur_row_data = (
+      ( $rows_pos >= 0 and $_[0][$rows_pos++] )
+        ||
+      ( $_[1] and $rows_pos = -1 and $_[1]->() )
+    ) ) {
+
+      # do not care about nullability here
+      $cur_row_ids{0} = $cur_row_data->[0];
+      $cur_row_ids{2} = $cur_row_data->[2];
+      $cur_row_ids{3} = $cur_row_data->[3];
+      $cur_row_ids{4} = $cur_row_data->[4];
+      $cur_row_ids{8} = $cur_row_data->[8];
+
+      # cache expensive set of ops in a non-existent rowid slot
+      $cur_row_ids{10} = (
+        ( ( defined $cur_row_data->[0] ) && (join "\xFF", q{}, $cur_row_data->[0], q{} ))
+          or
+        ( ( defined $cur_row_data->[2] ) && (join "\xFF", q{}, $cur_row_data->[2], q{} ))
+          or
+        "\0$rows_pos\0"
+      );
+
+      # a present cref in $_[1] implies lazy prefetch, implies a supplied stash in $_[2]
+      $_[1] and $result_pos and ! $collapse_idx[0]{$cur_row_ids{10}} and (unshift @{$_[2]}, $cur_row_data) and last;
+
+      $collapse_idx[0]{$cur_row_ids{10}} ||= $_[0][$result_pos++] = { year => $$cur_row_data[1] };
+
+      (! defined $cur_row_data->[0] ) ? $collapse_idx[0]{$cur_row_ids{10}}{single_track} = undef : do {
+
+        $collapse_idx[0]{$cur_row_ids{10}}{single_track} ||= ($collapse_idx[1]{$cur_row_ids{0}} = { trackid => $$cur_row_data[0] });
+
+        $collapse_idx[1]{$cur_row_ids{0}}{cd} ||= $collapse_idx[2]{$cur_row_ids{0}};
+
+        $collapse_idx[2]{$cur_row_ids{0}}{artist} ||= ($collapse_idx[3]{$cur_row_ids{0}} = { artistid => $$cur_row_data[6] });
+
+        (! defined $cur_row_data->[4] ) ? $collapse_idx[3]{$cur_row_ids{0}}{cds} = [] : do {
+
+          (! $collapse_idx[4]{$cur_row_ids{0}}{$cur_row_ids{4}} )
+            and
+          push @{$collapse_idx[3]{$cur_row_ids{0}}{cds}}, (
+              $collapse_idx[4]{$cur_row_ids{0}}{$cur_row_ids{4}} = { cdid => $$cur_row_data[4], genreid => $$cur_row_data[7], year => $$cur_row_data[5] }
+          );
+
+          (! defined $cur_row_data->[8] ) ? $collapse_idx[4]{$cur_row_ids{0}}{$cur_row_ids{4}}{tracks} = [] : do {
+
+            (! $collapse_idx[5]{$cur_row_ids{0}}{$cur_row_ids{4}}{$cur_row_ids{8}} )
+              and
+            push @{$collapse_idx[4]{$cur_row_ids{0}}{$cur_row_ids{4}}{tracks}}, (
+                $collapse_idx[5]{$cur_row_ids{0}}{$cur_row_ids{4}}{$cur_row_ids{8}} = { title => $$cur_row_data[8] }
+            );
+          };
+        };
+      };
+
+      (! defined $cur_row_data->[2] ) ? $collapse_idx[0]{$cur_row_ids{10}}{tracks} = [] : do {
+        (! $collapse_idx[6]{$cur_row_ids{2}}{$cur_row_ids{3}} )
+          and
+        push @{$collapse_idx[0]{$cur_row_ids{10}}{tracks}}, (
+            $collapse_idx[6]{$cur_row_ids{2}}{$cur_row_ids{3}} = { cd => $$cur_row_data[2], title => $$cur_row_data[3] }
+        );
+      };
+    }
+
+    $#{$_[0]} = $result_pos - 1;
+  ',
+  'Multiple has_many on multiple branches with underdefined root, HRI-direct torture test',
+);
+
 done_testing;
 
 my $deparser;
@@ -374,15 +753,25 @@ sub is_same_src {
   $deparser ||= B::Deparse->new;
   local $Test::Builder::Level = $Test::Builder::Level + 1;
 
-  my ($got, $expect) = map {
+  my ($got, $expect) = @_;
+
+  $expect =~ s/__NBC__/B::perlstring($DBIx::Class::ResultSource::RowParser::Util::null_branch_class)/ge;
+
+  $expect = "  { use strict; use warnings FATAL => 'all';\n$expect\n  }";
+
+  my @normalized = map {
     my $cref = eval "sub { $_ }" or do {
       fail "Coderef does not compile!\n\n$@\n\n$_";
       return undef;
     };
     $deparser->coderef2text($cref);
-  } @_[0,1];
-
-  is ($got, $expect, $_[2]||() )
-    or note ("Originals source:\n\n$_[0]\n\n$_[1]\n");
+  } ($got, $expect);
+
+  &is (@normalized, $_[2]||() ) or do {
+    eval { require Test::Differences }
+      ? &Test::Differences::eq_or_diff( @normalized, $_[2]||() )
+      : note ("Original sources:\n\n$got\n\n$expect\n")
+    ;
+    exit 1;
+  };
 }
-