[JS] Crash when reading IPC file with Union types

[kylebarron]

Describe the bug, including details regarding any error messages, version, and platform.

When loading an IPC file in Arrow JS using arrow.tableFromIPC, I get a crash when the file contains either a Sparse Union or a Dense Union column.

TypeError: Cannot destructure property 'length' of '(intermediate value)(intermediate value)(intermediate value)' as it is undefined.
 ❯ VectorLoader.readData node_modules/apache-arrow/src/visitor/vectorloader.ts:125:56
 ❯ VectorLoader.visitBool node_modules/apache-arrow/src/visitor/vectorloader.ts:61:113
 ❯ VectorLoader.visit node_modules/apache-arrow/src/visitor.ts:26:48
 ❯ VectorLoader.visit node_modules/apache-arrow/src/visitor/vectorloader.ts:54:22
 ❯ node_modules/apache-arrow/src/visitor.ts:23:44
 ❯ VectorLoader.visitMany node_modules/apache-arrow/src/visitor.ts:23:22
 ❯ VectorLoader.visitSparseUnion node_modules/apache-arrow/src/visitor/vectorloader.ts:103:150
 ❯ VectorLoader.visit node_modules/apache-arrow/src/visitor.ts:26:48
 ❯ VectorLoader.visit node_modules/apache-arrow/src/visitor/vectorloader.ts:54:22

Repro:

git clone https://github.com/kylebarron/arrow-js-ffi
git checkout 50dd5d1
yarn install
yarn test

In particular, this array is generated with this snippet from Python:

def sparse_union_array() -> pa.Array:
    """Generate a sparse union array

    This is derived from the example here https://arrow.apache.org/docs/python/data#union-arrays
    """
    # First child array
    xs = pa.array([5, 6, 7])

    # Second child array
    ys = pa.array([False, False, True])

    # Type mapping
    types = pa.array([0, 1, 1], type=pa.int8())

    # Union array
    union_arr = pa.UnionArray.from_sparse(types, [xs, ys])

    assert isinstance(union_arr, pa.UnionArray)
    assert union_arr[0].as_py() == 5
    assert union_arr[1].as_py() is False
    assert union_arr[2].as_py() is True

    return union_arr

which is then dumped into an uncompressed IPC file, which can't be read in JS.

Component(s)

JavaScript

[kylebarron]

@trxcllnt ; this may also be fixed by #37122

[kylebarron]

Fixed by #37122