X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FSQL%2FAbstract%2FReference.pm;h=b030f39b9d387811c4f0cb26c5d6830997c84501;hb=3c700ca3444b64dccee80083cb0970d63eb7d338;hp=67567ccf178971f5eab3c9b4da20ca20930f0ade;hpb=cc230faadb608351c7b6149b2b906687f8c23687;p=scpubgit%2FQ-Branch.git

diff --git a/lib/SQL/Abstract/Reference.pm b/lib/SQL/Abstract/Reference.pm
index 67567cc..b030f39 100644
--- a/lib/SQL/Abstract/Reference.pm
+++ b/lib/SQL/Abstract/Reference.pm
@@ -670,4 +670,46 @@ Expands the elements of the value arrayref:
   (?, foo, ?, ?)
   [ 1, 2, 3 ]
 
+=head2 op
+
+If an expander is registered for the op name, delegates to the expander; if
+not, expands the argument values:
+
+  # expr
+  { -op => [ 'ident', 'foo.bar' ] }
+
+  # aqt
+  { -ident => [ 'foo', 'bar' ] }
+
+  # query
+  foo.bar
+  []
+
+  # expr
+  { -op => [ '=', { -ident => 'foo' }, 3 ] }
+
+  # aqt
+  { -op => [ '=', { -ident => [ 'foo' ] }, { -bind => [ undef, 3 ] } ] }
+
+  # query
+  foo = ?
+  [ 3 ]
+
+=head2 func
+
+Expands the argument values:
+
+  # expr
+  { -func => [ 'coalesce', { -ident => 'thing' }, 'fallback' ] }
+
+  # aqt
+  { -func => [
+      'coalesce', { -ident => [ 'thing' ] },
+      { -bind => [ undef, 'fallback' ] },
+  ] }
+
+  # query
+  COALESCE(thing, ?)
+  [ 'fallback' ]
+
 =cut