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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.
import weakref
import numpy as np
import pyarrow as pa
from pyarrow.lib import StringBuilder
def test_weakref():
sbuilder = StringBuilder()
wr = weakref.ref(sbuilder)
assert wr() is not None
del sbuilder
assert wr() is None
def test_string_builder_append():
sbuilder = StringBuilder()
sbuilder.append(b"a byte string")
sbuilder.append("a string")
sbuilder.append(np.nan)
sbuilder.append(None)
assert len(sbuilder) == 4
assert sbuilder.null_count == 2
arr = sbuilder.finish()
assert len(sbuilder) == 0
assert isinstance(arr, pa.Array)
assert arr.null_count == 2
assert arr.type == 'str'
expected = ["a byte string", "a string", None, None]
assert arr.to_pylist() == expected
def test_string_builder_append_values():
sbuilder = StringBuilder()
sbuilder.append_values([np.nan, None, "text", None, "other text"])
assert sbuilder.null_count == 3
arr = sbuilder.finish()
assert arr.null_count == 3
expected = [None, None, "text", None, "other text"]
assert arr.to_pylist() == expected
def test_string_builder_append_after_finish():
sbuilder = StringBuilder()
sbuilder.append_values([np.nan, None, "text", None, "other text"])
arr = sbuilder.finish()
sbuilder.append("No effect")
expected = [None, None, "text", None, "other text"]
assert arr.to_pylist() == expected
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