refactor: Unify gbq execution as semi-executor

packages/bigframes/bigframes/core/compile/sqlglot/sqlglot_ir.py

@@ -177,7 +177,7 @@ def from_table(
         project_id: str,
         dataset_id: str,
         table_id: str,
-        uid_gen: guid.SequentialUIDGenerator,
+        uid_gen: guid.SequentialUIDGenerator | None = None,
         columns: typing.Sequence[str] = (),
         sql_predicate: typing.Optional[str] = None,
         system_time: typing.Optional[datetime.datetime] = None,
@@ -202,6 +202,8 @@ def from_table(
             if system_time
             else None
         )
+        if uid_gen is None:
+            uid_gen = guid.SequentialUIDGenerator()
         table_alias = next(uid_gen.get_uid_stream("bft_"))
         table_expr = sge.Table(
             this=sql.identifier(table_id),

packages/bigframes/bigframes/core/rewrite/__init__.py

@@ -19,7 +19,7 @@
 from bigframes.core.rewrite.implicit_align import try_row_join
 from bigframes.core.rewrite.legacy_align import legacy_join_as_projection
 from bigframes.core.rewrite.nullity import simplify_join
-from bigframes.core.rewrite.order import bake_order, defer_order
+from bigframes.core.rewrite.order import bake_order, defer_order, pull_out_order
 from bigframes.core.rewrite.pruning import column_pruning
 from bigframes.core.rewrite.scan_reduction import (
     try_reduce_to_local_scan,
@@ -50,6 +50,7 @@
     "rewrite_range_rolling",
     "try_reduce_to_table_scan",
     "bake_order",
+    "pull_out_order",
     "try_reduce_to_local_scan",
     "fold_row_counts",
     "pull_out_window_order",

packages/bigframes/bigframes/core/rewrite/order.py

@@ -47,6 +47,12 @@ def bake_order(
     return node
 
 
+def pull_out_order(
+    node: bigframes.core.nodes.BigFrameNode,
+) -> Tuple[bigframes.core.nodes.BigFrameNode, bigframes.core.ordering.RowOrdering]:
+    return _pull_up_order(node, order_root=False)
+
+
 # Makes ordering explicit in window definitions
 def _pull_up_order(
     root: bigframes.core.nodes.BigFrameNode,