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How may I construct a value of vec of vecs for a record batch? #6398

Answered by alamb
finlaydotb asked this question in Q&A
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How may I go about this?

I think you need to use a ListArray for this usecase

https://docs.rs/arrow/latest/arrow/array/type.ListArray.html

I recommend using a LIstBuilder like this:
https://docs.rs/arrow/latest/arrow/array/type.ListBuilder.html

Here is an example of use:

https://github.com/influxdata/influxdb_iox/blob/43078576b8b2896b3c148b21e6cc5c208a4bf3ea/flightsql/src/xdbc_type_info/mod.rs#L134C1-L135

(aka need to pass a StringBuilder to the ListBuilder

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