Teodor Kostov created ARROW-16371:
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Summary: [JS] Empty table should provide an empty iterator
Key: ARROW-16371
URL: https://issues.apache.org/jira/browse/ARROW-16371
Project: Apache Arrow
Issue Type: Bug
Components: JavaScript
Reporter: Teodor Kostov
When a table is created without any data and an iterator is requested I would
expect to get an empty iterator that just returns that it's done.
Expected result:
{code:json}
{"value": null, "done": true}
{code}
However, the code fails in {{strideForType()}} with {{Uncaught TypeError: type2
is undefined}}.
{code:javascript}
schema = new arrow.Schema(dataType.children)
data = new arrow.Table(this.schema)
const iter = data[Symbol.iterator]()
{code}
It seems that the [table just creates a new vector with its
data|https://github.com/apache/arrow/blob/e9481532e93e4f29a1c2c322e00f268d6cd9f534/js/src/table.ts#L227]
and then the [{{strideForType}} method
fails|https://github.com/apache/arrow/blob/e9481532e93e4f29a1c2c322e00f268d6cd9f534/js/src/type.ts#L652].
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