Hi Jenny,
In the 0.13 you have to pre-allocate the null bitmap and data buffers
ahead of time, then use `vec.set(idx, val)` to write each value in.
In 0.14 you can instead use the new Builders from PR #4476
<https://github.com/apache/arrow/pull/4476>. These will create and
resize the underlying buffers as you append values, and includes
chunking and streaming APIs for convenience. You can use them by
pointing npm to my github repo like I did here
<https://github.com/trxcllnt/csv-to-arrow-js/blob/2c625fb4b47a84044d62710f63c139a054281d83/package.json#L12>
if you don't mind using a prerelease build until 0.14 is out.
Best,
Paul
On 6/20/19 7:03 PM, Jenny Kwan wrote:
Apologies if this has been discussed before. I'm attempting to create Arrow
files in an Electron desktop app using JS. I can't find docs showing how to
create a RecordBatch with a column of, say, nullable bools. Using Table.from
and Table.new both keep coercing nulls to falses. Any pointers?
Thanks,
Jenny
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