chore: clean up ctx specification

Author: cpcloud

ibis/backends/polars/compiler.py

@@ -1257,12 +1257,11 @@ def execute_union(op, **kw):
 
 
 @translate.register(ops.Intersection)
-def execute_intersection(op, **kw):
-    ctx = kw.get("ctx")
+def execute_intersection(op, *, ctx, **kw):
     ctx.register_many(
         frames={
-            "left": translate(op.left, **kw),
-            "right": translate(op.right, **kw),
+            "left": translate(op.left, ctx=ctx **kw),
+            "right": translate(op.right, ctx=ctx, **kw),
         }
     )
     sql = (
@@ -1277,12 +1276,11 @@ def execute_intersection(op, **kw):
 
 
 @translate.register(ops.Difference)
-def execute_difference(op, **kw):
-    ctx = kw.get("ctx")
+def execute_difference(op, *, ctx, **kw):
     ctx.register_many(
         frames={
-            "left": translate(op.left, **kw),
-            "right": translate(op.right, **kw),
+            "left": translate(op.left, ctx=ctx, **kw),
+            "right": translate(op.right, ctx=ctx, **kw),
         }
     )
     sql = (