fix(api): selection using a selector yielding multiple columns (#8215)

ibis/expr/types/relations.py

@@ -764,13 +764,13 @@ def __getitem__(self, what):
             # Projection case
             return self.select(what)
 
-        (what,) = bind(self, what)
-        if isinstance(what, BooleanValue):
+        items = tuple(bind(self, what))
+        if util.all_of(items, BooleanValue):
             # TODO(kszucs): this branch should be removed, .filter should be
             # used instead
-            return self.filter([what])
+            return self.filter(items)
         else:
-            return self.select(what)
+            return self.select(items)
 
     def __len__(self):
         raise com.ExpressionError("Use .count() instead")

ibis/tests/expr/test_table.py

@@ -99,6 +99,19 @@ def test_getitem_column_select(table):
         assert isinstance(col, Column)
 
 
+def test_select_using_selector(table):
+    expr = table[s.numeric()]
+    expected = table.select(
+        table.a,
+        table.b,
+        table.c,
+        table.d,
+        table.e,
+        table.f,
+    )
+    assert expr.equals(expected)
+
+
 def test_table_tab_completion():
     table = ibis.table({"a": "int", "b": "int", "for": "int", "with spaces": "int"})
     # Only valid python identifiers in getattr tab completion