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Added support for projection pushdown on IPC files #264
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Closes #261 and #264 and simplifies internal code (to support this).
Backwards incompatible changes
ipc::read::FileReader::new
now accept a new parameterprojection: Option<Vec<usize>>
that can be used to filter columns.read::ipc::read_record_batch
now accept a new parameterprojection: Option<(&[usize], Arc<Schema>)>
that can be used to filter columns.where
usize
is the index of the column in the IPC schema (known from the file metadata).Columns not selected are neither read nor deserialized (i.e. are skipped). Pass
None
to recover the original behavior.