Fix revert column behavior

Now all columns are tested in the parquet test.

Signed-off-by: Will Beason <willbeason@gmail.com>

tables.py

@@ -58,13 +58,12 @@ class RevisionTable:
     def schema(self) -> pa.Schema:
         return pa.schema([c.field for c in self.columns])
 
-    def pop(self):
-        schema = self.schema()
-        data = []
+    def pop(self) -> dict:
+        data = {}
         for column in self.columns:
-            data.append(column.pop())
+            data[column.field.name] = column.pop()
 
-        return pa.table(data, schema)
+        return data
 
 
 class RevisionId(RevisionField[int]):