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Add basic C Data Interface import/export round-trip Array tests.
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‎matlab/test/arrow/c/tRoundTrip.m‎

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%TROUNDTRIP Tests for roundtripping using the C Data Interface format.
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% Licensed to the Apache Software Foundation (ASF) under one or more
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% contributor license agreements. See the NOTICE file distributed with
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% this work for additional information regarding copyright ownership.
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% The ASF licenses this file to you under the Apache License, Version
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% 2.0 (the "License"); you may not use this file except in compliance
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% with the License. You may obtain a copy of the License at
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%
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% http://www.apache.org/licenses/LICENSE-2.0
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%
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% Unless required by applicable law or agreed to in writing, software
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% distributed under the License is distributed on an "AS IS" BASIS,
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% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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% implied. See the License for the specific language governing
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% permissions and limitations under the License.
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classdef tRoundTrip < matlab.unittest.TestCase
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methods (Test)
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function EmptyArray(testCase)
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% Empty 0x0
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expected = arrow.array(double.empty(0, 0));
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cArray = arrow.c.Array();
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cSchema = arrow.c.Schema();
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expected.export(cArray.Address, cSchema.Address);
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actual = arrow.array.Array.import(cArray, cSchema);
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testCase.verifyEqual(actual, expected);
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% Empty 0x1
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expected = arrow.array(double.empty(0, 1));
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cArray = arrow.c.Array();
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cSchema = arrow.c.Schema();
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expected.export(cArray.Address, cSchema.Address);
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actual = arrow.array.Array.import(cArray, cSchema);
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testCase.verifyEqual(actual, expected);
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% Empty 1x0
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expected = arrow.array(double.empty(0, 1));
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cArray = arrow.c.Array();
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cSchema = arrow.c.Schema();
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expected.export(cArray.Address, cSchema.Address);
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actual = arrow.array.Array.import(cArray, cSchema);
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testCase.verifyEqual(actual, expected);
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end
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function ArrayWithNulls(testCase)
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% Scalar null
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expected = arrow.array(double(NaN));
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cArray = arrow.c.Array();
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cSchema = arrow.c.Schema();
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expected.export(cArray.Address, cSchema.Address);
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actual = arrow.array.Array.import(cArray, cSchema);
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testCase.verifyEqual(actual, expected);
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% Vector with nulls
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expected = arrow.array([1, NaN, 3, NaN, 5]);
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cArray = arrow.c.Array();
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cSchema = arrow.c.Schema();
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expected.export(cArray.Address, cSchema.Address);
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actual = arrow.array.Array.import(cArray, cSchema);
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testCase.verifyEqual(actual, expected);
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% Vector all nulls
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expected = arrow.array([NaN, NaN, NaN]);
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cArray = arrow.c.Array();
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cSchema = arrow.c.Schema();
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expected.export(cArray.Address, cSchema.Address);
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actual = arrow.array.Array.import(cArray, cSchema);
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testCase.verifyEqual(actual, expected);
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end
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function Float64Array(testCase)
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% Scalar
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expected = arrow.array(double(1));
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cArray = arrow.c.Array();
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cSchema = arrow.c.Schema();
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expected.export(cArray.Address, cSchema.Address);
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actual = arrow.array.Array.import(cArray, cSchema);
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testCase.verifyEqual(actual, expected);
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% Vector
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expected = arrow.array([1, 2, 3]);
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cArray = arrow.c.Array();
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cSchema = arrow.c.Schema();
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expected.export(cArray.Address, cSchema.Address);
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actual = arrow.array.Array.import(cArray, cSchema);
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testCase.verifyEqual(actual, expected);
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end
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function StringArray(testCase)
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% Scalar
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expected = arrow.array("A");
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cArray = arrow.c.Array();
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cSchema = arrow.c.Schema();
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expected.export(cArray.Address, cSchema.Address);
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actual = arrow.array.Array.import(cArray, cSchema);
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testCase.verifyEqual(actual, expected);
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% Vector
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expected = arrow.array(["A", "B", "C"]);
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cArray = arrow.c.Array();
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cSchema = arrow.c.Schema();
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expected.export(cArray.Address, cSchema.Address);
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actual = arrow.array.Array.import(cArray, cSchema);
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testCase.verifyEqual(actual, expected);
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end
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function TimestampArray(testCase)
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% Scalar
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expected = arrow.array(datetime(2024, 1, 1));
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cArray = arrow.c.Array();
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cSchema = arrow.c.Schema();
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expected.export(cArray.Address, cSchema.Address);
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actual = arrow.array.Array.import(cArray, cSchema);
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testCase.verifyEqual(actual, expected);
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% Vector
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expected = arrow.array([...
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datetime(2024, 1, 1),...
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datetime(2024, 1, 2),...
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datetime(2024, 1, 3)...
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]);
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cArray = arrow.c.Array();
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cSchema = arrow.c.Schema();
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expected.export(cArray.Address, cSchema.Address);
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actual = arrow.array.Array.import(cArray, cSchema);
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testCase.verifyEqual(actual, expected);
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end
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function ExportErrorWrongInputTypes(testCase)
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A = arrow.array([1, 2, 3]);
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fcn = @() A.export("cArray.Address", "cSchema.Address");
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testCase.verifyError(fcn, "MATLAB:validation:UnableToConvert");
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end
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function ExportTooFewInputs(testCase)
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A = arrow.array([1, 2, 3]);
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fcn = @() A.export();
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testCase.verifyError(fcn, "MATLAB:minrhs");
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end
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function ExportTooManyInputs(testCase)
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A = arrow.array([1, 2, 3]);
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fcn = @() A.export("A", "B", "C");
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testCase.verifyError(fcn, "MATLAB:TooManyInputs");
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end
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function ImportErrorWrongInputTypes(testCase)
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cArray = "arrow.c.Array";
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cSchema = "arrow.c.Schema";
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fcn = @() arrow.array.Array.import(cArray, cSchema);
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testCase.verifyError(fcn, "MATLAB:validation:UnableToConvert");
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end
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function ImportTooFewInputs(testCase)
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fcn = @() arrow.array.Array.import();
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testCase.verifyError(fcn, "MATLAB:minrhs");
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end
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function ImportTooManyInputs(testCase)
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A = arrow.array([1, 2, 3]);
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fcn = @() arrow.array.Array.import("A", "B", "C");
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testCase.verifyError(fcn, "MATLAB:TooManyInputs");
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end
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function ImportErrorImportFailed(testCase)
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cArray = arrow.c.Array();
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cSchema = arrow.c.Schema();
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% An arrow:c:import:ImportFailed error should be thrown
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% if the supplied arrow.c.Array and arrow.c.Schema were
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% never populated previously from an exported Array.
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fcn = @() arrow.array.Array.import(cArray, cSchema);
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testCase.verifyError(fcn, "arrow:c:import:ImportFailed");
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end
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end
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end

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