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# Copyright 2023 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. | ||
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"""Shared helper functions for connecting BigQuery and pyarrow.""" | ||
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from typing import Any | ||
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from packaging import version | ||
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try: | ||
import pyarrow # type: ignore | ||
except ImportError: # pragma: NO COVER | ||
pyarrow = None | ||
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def pyarrow_datetime(): | ||
return pyarrow.timestamp("us", tz=None) | ||
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def pyarrow_numeric(): | ||
return pyarrow.decimal128(38, 9) | ||
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def pyarrow_bignumeric(): | ||
# 77th digit is partial. | ||
# https://cloud.google.com/bigquery/docs/reference/standard-sql/data-types#decimal_types | ||
return pyarrow.decimal256(76, 38) | ||
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def pyarrow_time(): | ||
return pyarrow.time64("us") | ||
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def pyarrow_timestamp(): | ||
return pyarrow.timestamp("us", tz="UTC") | ||
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_BQ_TO_ARROW_SCALARS = {} | ||
_ARROW_SCALAR_IDS_TO_BQ = {} | ||
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if pyarrow: | ||
# This dictionary is duplicated in bigquery_storage/test/unite/test_reader.py | ||
# When modifying it be sure to update it there as well. | ||
# Note(todo!!): type "BIGNUMERIC"'s matching pyarrow type is added in _pandas_helpers.py | ||
_BQ_TO_ARROW_SCALARS = { | ||
"BOOL": pyarrow.bool_, | ||
"BOOLEAN": pyarrow.bool_, | ||
"BYTES": pyarrow.binary, | ||
"DATE": pyarrow.date32, | ||
"DATETIME": pyarrow_datetime, | ||
"FLOAT": pyarrow.float64, | ||
"FLOAT64": pyarrow.float64, | ||
"GEOGRAPHY": pyarrow.string, | ||
"INT64": pyarrow.int64, | ||
"INTEGER": pyarrow.int64, | ||
"NUMERIC": pyarrow_numeric, | ||
"STRING": pyarrow.string, | ||
"TIME": pyarrow_time, | ||
"TIMESTAMP": pyarrow_timestamp, | ||
} | ||
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_ARROW_SCALAR_IDS_TO_BQ = { | ||
# https://arrow.apache.org/docs/python/api/datatypes.html#type-classes | ||
pyarrow.bool_().id: "BOOL", | ||
pyarrow.int8().id: "INT64", | ||
pyarrow.int16().id: "INT64", | ||
pyarrow.int32().id: "INT64", | ||
pyarrow.int64().id: "INT64", | ||
pyarrow.uint8().id: "INT64", | ||
pyarrow.uint16().id: "INT64", | ||
pyarrow.uint32().id: "INT64", | ||
pyarrow.uint64().id: "INT64", | ||
pyarrow.float16().id: "FLOAT64", | ||
pyarrow.float32().id: "FLOAT64", | ||
pyarrow.float64().id: "FLOAT64", | ||
pyarrow.time32("ms").id: "TIME", | ||
pyarrow.time64("ns").id: "TIME", | ||
pyarrow.timestamp("ns").id: "TIMESTAMP", | ||
pyarrow.date32().id: "DATE", | ||
pyarrow.date64().id: "DATETIME", # because millisecond resolution | ||
pyarrow.binary().id: "BYTES", | ||
pyarrow.string().id: "STRING", # also alias for pyarrow.utf8() | ||
# The exact scale and precision don't matter, see below. | ||
pyarrow.decimal128(38, scale=9).id: "NUMERIC", | ||
} | ||
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# Adds bignumeric support only if pyarrow version >= 3.0.0 | ||
# Decimal256 support was added to arrow 3.0.0 | ||
# https://arrow.apache.org/blog/2021/01/25/3.0.0-release/ | ||
if version.parse(pyarrow.__version__) >= version.parse("3.0.0"): | ||
_BQ_TO_ARROW_SCALARS["BIGNUMERIC"] = pyarrow_bignumeric | ||
# The exact decimal's scale and precision are not important, as only | ||
# the type ID matters, and it's the same for all decimal256 instances. | ||
_ARROW_SCALAR_IDS_TO_BQ[pyarrow.decimal256(76, scale=38).id] = "BIGNUMERIC" | ||
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def bq_to_arrow_scalars(bq_scalar: str): | ||
""" | ||
Returns: | ||
The Arrow scalar type that the input BigQuery scalar type maps to. | ||
If it cannot find the BigQuery scalar, return None. | ||
""" | ||
return _BQ_TO_ARROW_SCALARS.get(bq_scalar) | ||
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def arrow_scalar_ids_to_bq(arrow_scalar: Any): | ||
""" | ||
Returns: | ||
The BigQuery scalar type that the input arrow scalar type maps to. | ||
If it cannot find the arrow scalar, return None. | ||
""" | ||
return _ARROW_SCALAR_IDS_TO_BQ.get(arrow_scalar) |
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