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%TSLICE Unit tests verifying the behavior of arrow.array.Array's slice
%method.
% 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.
classdef tSlice < matlab.unittest.TestCase
methods(Test)
function BooleanArray(testCase)
% Verify the slice method returns the expected array when
% called on a Boolean Array.
boolArray = arrow.array([true true false true true false], Valid=[1 2 3 6]);
slice = boolArray.slice(int64(2), int64(4));
testCase.verifyEqual(slice.NumElements, int64(4));
testCase.verifyEqual(slice.Valid, [true; true; false; false]);
testCase.verifyEqual(toMATLAB(slice), [true; false; false; false]);
end
function NumericArray(testCase)
% Verify the slice method returns the expected array when
% called on a Numeric Array.
float64Array = arrow.array(1:10, Valid=[2 3 4 5 8 10]);
slice = float64Array.slice(int64(4), int64(5));
testCase.verifyEqual(slice.NumElements, int64(5));
testCase.verifyEqual(slice.Valid, [true; true; false; false; true]);
testCase.verifyEqual(toMATLAB(slice), [4; 5; NaN; NaN; 8]);
end
function DateArray(testCase)
% Verify the slice method returns the expected array when
% called on a Date Array.
import arrow.array.Date32Array
dates = datetime(2023, 11, 8:16);
date32Array = Date32Array.fromMATLAB(dates, Valid=[4 5 6 9]);
slice = date32Array.slice(int64(3), int64(4));
testCase.verifyEqual(slice.NumElements, int64(4));
testCase.verifyEqual(slice.Valid, [false; true; true; true]);
expected = [NaT; dates(4:6)'];
testCase.verifyEqual(toMATLAB(slice), expected);
end
function TimeArray(testCase)
% Verify the slice method returns the expected array when
% called on a Time Array.
times = seconds(10:20);
time64Array = arrow.array(times, Valid=[2 4 6 7 8 10]);
slice = time64Array.slice(int64(5), int64(6));
testCase.verifyEqual(slice.NumElements, int64(6));
testCase.verifyEqual(slice.Valid, [false; true; true; true; false; true]);
expected = [NaN; times(6:8)'; NaN; times(10)];
testCase.verifyEqual(toMATLAB(slice), expected);
end
function TimestampArray(testCase)
% Verify the slice method returns the expected array when
% called on a TimestampArray.
dates = datetime(2023, 11, 8:16);
date32Array = arrow.array(dates, Valid=[1 2 4 5 6 8]);
slice = date32Array.slice(int64(5), int64(3));
testCase.verifyEqual(slice.NumElements, int64(3));
testCase.verifyEqual(slice.Valid, [true; true; false]);
expected = [dates(5:6)'; NaT];
testCase.verifyEqual(toMATLAB(slice), expected);
end
function StringArray(testCase)
% Verify the slice method returns the expected array when
% called on a StringArray.
stringArray = arrow.array(["a" "b" "c" "d" "e" "f" "g"], Valid=[1 3 4 5 6]);
slice = stringArray.slice(int64(2), int64(3));
testCase.verifyEqual(slice.NumElements, int64(3));
testCase.verifyEqual(slice.Valid, [false; true; true]);
expected = [missing; "c"; "d"];
testCase.verifyEqual(toMATLAB(slice), expected);
end
function ListArray(testCase)
% Verify the slice method returns the expected array when
% called on a ListArray.
cellArray = {missing, [1, 2, 3], missing, [4, NaN], [6, 7, 8], missing};
listArray = arrow.array(cellArray);
slice = listArray.slice(int64(2), int64(4));
testCase.verifyEqual(slice.NumElements, int64(4));
testCase.verifyEqual(slice.Valid, [true; false; true; true]);
expected = {[1; 2; 3]; missing; [4; NaN]; [6; 7; 8]};
testCase.verifyEqual(toMATLAB(slice), expected);
end
function StructArray(testCase)
% Verify the slice method returns the expected array when
% called on a StructArray.
numbers = [NaN; 2; 3; 4; 5; 6; 7; NaN; 9; 10];
text = ["a"; missing; "c"; "d"; "e"; missing; "g"; "h"; "i"; "j"];
t = table(numbers, text);
structArray = arrow.array(t, Valid=[1 2 3 6 7 8 10]);
slice = structArray.slice(int64(5), int64(4));
testCase.verifyEqual(slice.NumElements, int64(4));
testCase.verifyEqual(slice.Valid, [false; true; true; true]);
expected = t(5:8, :);
expected.numbers(1) = NaN;
expected.text(1) = missing;
testCase.verifyEqual(toMATLAB(slice), expected);
end
function NonPositiveOffsetError(testCase)
% Verify the slice method throws an error whose identifier is
% "arrow:array:slice:NonPositiveOffset" if given a non-positive
% value as the offset.
array = arrow.array(1:10);
fcn = @() array.slice(int64(0), int64(2));
testCase.verifyError(fcn, "arrow:array:slice:NonPositiveOffset");
fcn = @() array.slice(int64(-1), int64(2));
testCase.verifyError(fcn, "arrow:array:slice:NonPositiveOffset");
end
function NegativeLengthError(testCase)
% Verify the slice method throws an error whose identifier is
% "arrow:array:slice:NegativeLength" if given a negative value
% as the length.
array = arrow.array(1:10);
fcn = @() array.slice(int64(1), int64(-1));
testCase.verifyError(fcn, "arrow:array:slice:NegativeLength");
end
end
end
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