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types.py
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180 lines (134 loc) · 4.19 KB
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# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you 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.
# Tools for dealing with Arrow type metadata in Python
import pyarrow.lib as lib
_SIGNED_INTEGER_TYPES = {lib.Type_INT8, lib.Type_INT16, lib.Type_INT32,
lib.Type_INT64}
_UNSIGNED_INTEGER_TYPES = {lib.Type_UINT8, lib.Type_UINT16, lib.Type_UINT32,
lib.Type_UINT64}
_INTEGER_TYPES = _SIGNED_INTEGER_TYPES | _UNSIGNED_INTEGER_TYPES
_FLOATING_TYPES = {lib.Type_HALF_FLOAT, lib.Type_FLOAT, lib.Type_DOUBLE}
_DATE_TYPES = {lib.Type_DATE32, lib.Type_DATE64}
_TIME_TYPES = {lib.Type_TIME32, lib.Type_TIME64}
_TEMPORAL_TYPES = {lib.Type_TIMESTAMP} | _TIME_TYPES | _DATE_TYPES
_NESTED_TYPES = {lib.Type_LIST, lib.Type_STRUCT, lib.Type_UNION, lib.Type_MAP}
def is_boolean(t):
"""
Return True if value is an instance of a boolean type
"""
return t.id == lib.Type_BOOL
def is_integer(t):
"""
Return True if value is an instance of an integer type
"""
return t.id in _INTEGER_TYPES
def is_signed_integer(t):
"""
Return True if value is an instance of a signed integer type
"""
return t.id in _SIGNED_INTEGER_TYPES
def is_unsigned_integer(t):
"""
Return True if value is an instance of an unsigned integer type
"""
return t.id in _UNSIGNED_INTEGER_TYPES
def is_floating(t):
"""
Return True if value is an instance of a floating point numeric type
"""
return t.id in _FLOATING_TYPES
def is_list(t):
"""
Return True if value is an instance of a list type
"""
return t.id == lib.Type_LIST
def is_struct(t):
"""
Return True if value is an instance of a struct type
"""
return t.id == lib.Type_STRUCT
def is_union(t):
"""
Return True if value is an instance of a union type
"""
return t.id == lib.Type_UNION
def is_nested(t):
"""
Return True if value is an instance of a nested type
"""
return t.id in _NESTED_TYPES
def is_temporal(t):
"""
Return True if value is an instance of a temporal (date, time, timestamp)
type
"""
return t.id in _TEMPORAL_TYPES
def is_timestamp(t):
"""
Return True if value is an instance of a timestamp type
"""
return t.id == lib.Type_TIMESTAMP
def is_time(t):
"""
Return True if value is an instance of a time type
"""
return t.id in _TIME_TYPES
def is_null(t):
"""
Return True if value is an instance of a null type
"""
return t.id == lib.Type_NA
def is_binary(t):
"""
Return True if value is an instance of a variable-length binary type
"""
return t.id == lib.Type_BINARY
def is_unicode(t):
"""
Alias for is_string
"""
return is_string(t)
def is_string(t):
"""
Return True if value is an instance of string (utf8 unicode) type
"""
return t.id == lib.Type_STRING
def is_fixed_size_binary(t):
"""
Return True if value is an instance of a fixed size binary type
"""
return t.id == lib.Type_FIXED_SIZE_BINARY
def is_date(t):
"""
Return True if value is an instance of a date type
"""
return t.id in _DATE_TYPES
def is_map(t):
"""
Return True if value is an instance of a map logical type
"""
return t.id == lib.Type_MAP
def is_decimal(t):
"""
Return True if value is an instance of a decimal type
"""
return t.id == lib.Type_DECIMAL
def is_dictionary(t):
"""
Return True if value is an instance of a dictionary-encoded type
"""
return t.id == lib.Type_DICTIONARY