Rank selection supports scanners.

`rank` also doesn't require column selection.

graphique/interface.py

@@ -320,10 +320,10 @@ def sort(
     )
     def rank(self, info: Info, by: list[str], max: int = 1) -> Self:
         """Return table selected by maximum dense rank."""
-        expr, by = T.rank_keys(self.source, max, *by)
+        source = self.to_table(info) if isinstance(self.source, ds.Scanner) else self.source
+        expr, by = T.rank_keys(source, max, *by)
         if expr is not None:
-            self = type(self)(self.source.filter(expr))
-        source = self.select(info)
+            source = source.filter(expr)
         return type(self)(T.rank(source, max, *by) if by else source)
 
     @staticmethod

tests/test_models.py

@@ -12,6 +12,8 @@ def test_camel(aliasclient):
     assert data == {'filter': {'length': 1}}
     data = aliasclient.execute('{ group(by: "camelId") { length } }')
     assert data == {'group': {'length': 2}}
+    data = aliasclient.execute('{ rank(by: "camelId") { length } }')
+    assert data == {'rank': {'length': 1}}
 
 
 def test_snake(executor):