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https://issues.apache.org/jira/browse/ARROW-10406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17259261#comment-17259261
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Antoine Pitrou edited comment on ARROW-10406 at 1/5/21, 10:37 PM:
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Hmm, what does this have to do with the CSV reader? You can perfectly well
write that data to an IPC stream (even as a file in the more general meaning)
or to a Parquet file. You just can't write it to an IPC file (as in "file
format").
was (Author: pitrou):
Hmm, what does this have to with the CSV reader? You can perfectly well write
that data to an IPC stream (even as a file in the more general meaning) or to a
Parquet file. You just can't write it to an IPC file (as in "file format").
> [Format] Support dictionary replacement in the IPC file format
> --------------------------------------------------------------
>
> Key: ARROW-10406
> URL: https://issues.apache.org/jira/browse/ARROW-10406
> Project: Apache Arrow
> Issue Type: Wish
> Components: Format
> Reporter: Neal Richardson
> Priority: Major
>
> I read a big (taxi) csv file and specified that I wanted to dictionary-encode
> some columns. The resulting Table has ChunkedArrays with 1604 chunks. When I
> go to write this Table to the IPC file format (write_feather), I get an
> error:
> {code}
> Invalid: Dictionary replacement detected when writing IPC file format.
> Arrow IPC files only support a single dictionary for a given field accross
> all batches.
> {code}
> I can write this to Parquet and read it back in, and the roundtrip of the
> data is correct. We should be able to do this in IPC too.
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