refactor: move log_adapter.py under logging/ directory (#2376)

We will have more logging utilities in the future. It's better to
organize them into a separate directory now.

Related issue: 406578908

Author: sycai

bigframes/bigquery/__init__.py

@@ -60,7 +60,7 @@
 from bigframes.bigquery._operations.search import create_vector_index, vector_search
 from bigframes.bigquery._operations.sql import sql_scalar
 from bigframes.bigquery._operations.struct import struct
-from bigframes.core import log_adapter
+from bigframes.core.logging import log_adapter
 
 _functions = [
     # approximate aggregate ops

bigframes/bigquery/_operations/ai.py

@@ -26,7 +26,8 @@
 from bigframes import clients, dataframe, dtypes
 from bigframes import pandas as bpd
 from bigframes import series, session
-from bigframes.core import convert, log_adapter
+from bigframes.core import convert
+from bigframes.core.logging import log_adapter
 from bigframes.ml import core as ml_core
 from bigframes.operations import ai_ops, output_schemas
 

bigframes/bigquery/_operations/ml.py

@@ -20,7 +20,7 @@
 import google.cloud.bigquery
 import pandas as pd
 
-import bigframes.core.log_adapter as log_adapter
+import bigframes.core.logging.log_adapter as log_adapter
 import bigframes.core.sql.ml
 import bigframes.dataframe as dataframe
 import bigframes.ml.base

bigframes/core/groupby/dataframe_group_by.py

@@ -26,10 +26,10 @@
 from bigframes import session
 from bigframes.core import agg_expressions
 from bigframes.core import expression as ex
-from bigframes.core import log_adapter
 import bigframes.core.block_transforms as block_ops
 import bigframes.core.blocks as blocks
 from bigframes.core.groupby import aggs, group_by, series_group_by
+from bigframes.core.logging import log_adapter
 import bigframes.core.ordering as order
 import bigframes.core.utils as utils
 import bigframes.core.validations as validations

bigframes/core/groupby/series_group_by.py

@@ -25,10 +25,10 @@
 
 from bigframes import session
 from bigframes.core import expression as ex
-from bigframes.core import log_adapter
 import bigframes.core.block_transforms as block_ops
 import bigframes.core.blocks as blocks
 from bigframes.core.groupby import aggs, group_by
+from bigframes.core.logging import log_adapter
 import bigframes.core.ordering as order
 import bigframes.core.utils as utils
 import bigframes.core.validations as validations

bigframes/core/logging/__init__.py

@@ -0,0 +1,17 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from bigframes.core.logging import log_adapter
+
+__all__ = ["log_adapter"]

bigframes/core/log_adapter.py bigframes/core/logging/log_adapter.pybigframes/core/log_adapter.py renamed to bigframes/core/logging/log_adapter.py

@@ -24,8 +24,9 @@
 from bigframes import dtypes
 from bigframes.core import agg_expressions
 from bigframes.core import expression as ex
-from bigframes.core import log_adapter, ordering, utils, window_spec
+from bigframes.core import ordering, utils, window_spec
 import bigframes.core.blocks as blocks
+from bigframes.core.logging import log_adapter
 from bigframes.core.window import ordering as window_ordering
 import bigframes.operations.aggregations as agg_ops
 

bigframes/core/window/rolling.py

@@ -55,7 +55,7 @@
 
 import bigframes.constants
 import bigframes.core
-from bigframes.core import agg_expressions, log_adapter
+from bigframes.core import agg_expressions
 import bigframes.core.block_transforms as block_ops
 import bigframes.core.blocks as blocks
 import bigframes.core.convert
@@ -66,6 +66,7 @@
 import bigframes.core.indexers as indexers
 import bigframes.core.indexes as indexes
 import bigframes.core.interchange
+from bigframes.core.logging import log_adapter
 import bigframes.core.ordering as order
 import bigframes.core.utils as utils
 import bigframes.core.validations as validations

bigframes/dataframe.py

@@ -24,7 +24,7 @@
 import pandas as pd
 
 import bigframes
-from bigframes.core import log_adapter
+from bigframes.core.logging import log_adapter
 from bigframes.ml import base, core, globals, utils
 import bigframes.pandas as bpd