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# Copyright 2025 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.
"""Helpers for the pyformat feature."""
# TODO(tswast): consolidate with pandas-gbq and bigquery-magics. See:
# https://github.com/googleapis/python-bigquery-magics/blob/main/bigquery_magics/pyformat.py
from __future__ import annotations
import string
import typing
from typing import Any, Optional, Union
import google.cloud.bigquery
import pandas
from bigframes.core import utils
import bigframes.core.local_data
from bigframes.core.tools import bigquery_schema
import bigframes.session
_BQ_TABLE_TYPES = Union[
google.cloud.bigquery.Table,
google.cloud.bigquery.TableReference,
google.cloud.bigquery.table.TableListItem,
]
def _table_to_sql(table: _BQ_TABLE_TYPES) -> str:
return f"`{table.project}`.`{table.dataset_id}`.`{table.table_id}`"
def _pandas_df_to_sql_dry_run(pd_df: pandas.DataFrame) -> str:
# Ensure there are no duplicate column labels.
#
# Please make sure this stays in sync with the logic used to_gbq(). See
# bigframes.dataframe.DataFrame._prepare_export().
new_col_labels, new_idx_labels = utils.get_standardized_ids(
pd_df.columns, pd_df.index.names
)
pd_copy = pd_df.copy()
pd_copy.columns = pandas.Index(new_col_labels)
pd_copy.index.names = new_idx_labels
managed_table = bigframes.core.local_data.ManagedArrowTable.from_pandas(pd_copy)
bqschema = managed_table.schema.to_bigquery()
return bigquery_schema.to_sql_dry_run(bqschema)
def _pandas_df_to_sql(
df_pd: pandas.DataFrame,
*,
name: str,
session: Optional[bigframes.session.Session] = None,
dry_run: bool = False,
) -> str:
if session is None:
if not dry_run:
message = (
f"Can't embed pandas DataFrame {name} in a SQL "
"string without a bigframes session except if for a dry run."
)
raise ValueError(message)
return _pandas_df_to_sql_dry_run(df_pd)
# Use the _deferred engine to avoid loading data too often during dry run.
df = session.read_pandas(df_pd, write_engine="_deferred")
return _table_to_sql(df._to_placeholder_table(dry_run=dry_run))
def _field_to_template_value(
name: str,
value: Any,
*,
session: Optional[bigframes.session.Session] = None,
dry_run: bool = False,
) -> str:
"""Convert value to something embeddable in a SQL string."""
import bigframes.core.compile.sqlglot.sql as sql # Avoid circular imports
import bigframes.dataframe # Avoid circular imports
_validate_type(name, value)
table_types = typing.get_args(_BQ_TABLE_TYPES)
if isinstance(value, table_types):
return _table_to_sql(value)
if isinstance(value, pandas.DataFrame):
return _pandas_df_to_sql(value, session=session, dry_run=dry_run, name=name)
if isinstance(value, bigframes.dataframe.DataFrame):
return _table_to_sql(value._to_placeholder_table(dry_run=dry_run))
if isinstance(value, str):
return value
return sql.to_sql(sql.literal(value))
def _validate_type(name: str, value: Any):
"""Raises TypeError if value is unsupported."""
import bigframes.dataframe # Avoid circular imports
import bigframes.dtypes # Avoid circular imports
if value is None:
return # None can't be used in isinstance, but is a valid literal.
supported_types = (
typing.get_args(_BQ_TABLE_TYPES)
+ bigframes.dtypes.SUPPORTED_LITERAL_TYPES
+ (bigframes.dataframe.DataFrame,)
+ (pandas.DataFrame,)
)
if not isinstance(value, supported_types):
raise TypeError(
f"{name} has unsupported type: {type(value)}. "
f"Only {supported_types} are supported."
)
def _parse_fields(sql_template: str) -> list[str]:
return [
field_name
for _, field_name, _, _ in string.Formatter().parse(sql_template)
if field_name is not None
]
def pyformat(
sql_template: str,
*,
pyformat_args: dict,
session: Optional[bigframes.session.Session] = None,
dry_run: bool = False,
) -> str:
"""Unsafe Python-style string formatting of SQL string.
Only some data types supported.
Warning: strings are **not** escaped. This allows them to be used in
contexts such as table identifiers, where normal query parameters are not
supported.
Args:
sql_template (str):
SQL string with 0+ {var_name}-style format options.
pyformat_args (dict):
Variable namespace to use for formatting.
Raises:
TypeError: if a referenced variable is not of a supported type.
KeyError: if a referenced variable is not found.
"""
fields = _parse_fields(sql_template)
format_kwargs = {}
for name in fields:
value = pyformat_args[name]
format_kwargs[name] = _field_to_template_value(
name, value, session=session, dry_run=dry_run
)
return sql_template.format(**format_kwargs)