Add cats info to column chunks, propagate through #141
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mrocklin
reviewed
May 1, 2017
| @@ -570,6 +571,9 @@ def write_column(f, data, selement, compression=None): | |||
| total_uncompressed_size=uncompressed_size, | |||
| total_compressed_size=compressed_size) | |||
| if cats: | |||
| # all chunks describe if they are categorical | |||
| cmd.key_value_metadata = [ | |||
| parquet_thrift.KeyValue(key="fastparquet.cats", value=str(ncats))] | |||
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Do you have any interest in figuring out a solution that is not restricted to only fastparquet? Other projects might also benefit from this sort of metadata.
|
This PR to be restarted following the spec developed in pandas-dev/pandas#16315 . Closing for now. |
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Enables dask to auto-read categories, but generally not a bad idea.