test/unit/table/table-test.ts

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//
//   http://www.apache.org/licenses/LICENSE-2.0
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import { Bool, Dictionary, Float32, Float64, Int32, Int8, makeTable, tableFromArrays, tableFromJSON } from 'apache-arrow';

describe('makeTable()', () => {
    test(`creates a new Table from Typed Arrays`, () => {
        const i32s = Int32Array.from({ length: 10 }, (_, i) => i);
        const f32s = Float32Array.from({ length: 10 }, (_, i) => i);
        const table = makeTable({ i32s, f32s });
        const i32 = table.getChild('i32s')!;
        const f32 = table.getChild('f32s')!;
        expect(table.getChild('foo' as any)).toBeNull();

        expect(table.numRows).toBe(10);
        expect(i32.type).toBeInstanceOf(Int32);
        expect(f32.type).toBeInstanceOf(Float32);
        expect(i32).toHaveLength(10);
        expect(f32).toHaveLength(10);
        expect(i32.toArray()).toBeInstanceOf(Int32Array);
        expect(f32.toArray()).toBeInstanceOf(Float32Array);
        expect(i32.toArray()).toEqual(i32s);
        expect(f32.toArray()).toEqual(f32s);
    });
});

describe('tableFromArrays()', () => {
    test(`creates table from typed arrays and JavaScript arrays`, () => {
        const table = tableFromArrays({
            a: new Float32Array([1, 2]),
            b: new Int8Array([1, 2]),
            c: [1, 2, 3],
            d: ['foo', 'bar'],
        });

        expect(table.numRows).toBe(3);
        expect(table.numCols).toBe(4);

        expect(table.getChild('a')!.type).toBeInstanceOf(Float32);
        expect(table.getChild('b')!.type).toBeInstanceOf(Int8);
        expect(table.getChild('c')!.type).toBeInstanceOf(Float64);
        expect(table.getChild('d')!.type).toBeInstanceOf(Dictionary);
        expect(table.getChild('e' as any)).toBeNull();
    });
});


describe('tableFromJSON()', () => {
    test(`creates table from array of objects`, () => {
        const table = tableFromJSON([{
            a: 42,
            b: true,
            c: 'foo',
        }, {
            a: 12,
            b: false,
            c: 'bar',
        }]);

        expect(table.numRows).toBe(2);
        expect(table.numCols).toBe(3);

        expect(table.getChild('a')!.type).toBeInstanceOf(Float64);
        expect(table.getChild('b')!.type).toBeInstanceOf(Bool);
        expect(table.getChild('c')!.type).toBeInstanceOf(Dictionary);
    });
});