refactor: Remove join name mapper code. (#597)

* refactor: Remove join name mapper code.

* remove dead import

Author: TrevorBergeron

bigframes/core/compile/single_column.py

@@ -23,8 +23,8 @@
 import ibis.expr.types as ibis_types
 
 import bigframes.core.compile.compiled as compiled
+import bigframes.core.guid as guids
 import bigframes.core.join_def as join_defs
-import bigframes.core.joins as joining
 import bigframes.core.ordering as orderings
 
 
@@ -50,9 +50,13 @@ def join_by_column_ordered(
         finally, all the right columns.
     """
 
-    l_hidden_mapping, r_hidden_mapping = joining.JoinNameRemapper(namespace="hidden")(
-        left._hidden_column_ids, right._hidden_column_ids
-    )
+    l_hidden_mapping = {
+        id: guids.generate_guid("hidden_") for id in left._hidden_column_ids
+    }
+    r_hidden_mapping = {
+        id: guids.generate_guid("hidden_") for id in right._hidden_column_ids
+    }
+
     l_mapping = {**join.get_left_mapping(), **l_hidden_mapping}
     r_mapping = {**join.get_right_mapping(), **r_hidden_mapping}
 

bigframes/core/joins/__init__.py

@@ -15,6 +15,7 @@
 """Helpers to join ArrayValue objects."""
 
 from bigframes.core.joins.merge import merge
-from bigframes.core.joins.name_resolution import JoinNameRemapper
 
-__all__ = ("merge", "JoinNameRemapper")
+__all__ = [
+    "merge",
+]

bigframes/core/joins/name_resolution.py

@@ -59,6 +59,7 @@
 import bigframes.core.expression as ex
 import bigframes.core.global_session as global_session
 import bigframes.core.indexes
+import bigframes.core.joins
 import bigframes.core.reshape
 import bigframes.core.tools
 import bigframes.dataframe