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Projection pushdown for load_cdf #2681

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PDEUXA opened this issue Jul 17, 2024 · 0 comments · Fixed by #2704
Closed

Projection pushdown for load_cdf #2681

PDEUXA opened this issue Jul 17, 2024 · 0 comments · Fixed by #2704
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enhancement New feature or request

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@PDEUXA
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PDEUXA commented Jul 17, 2024

Description

Use Case

When reading a delta table from package from exemple with (load_cdf), then read_all(), the whole data is read.

It could be interesting to only select some specifics columns, to benefit from pushdown filters (and so i/o). Thus the PyArrow table generated is limited to some fields.

It seems it could be done by the passing arguments (pyarrow.ipc.IpcReadOptions) to RecordBatchFileReader

Related Issue(s)
@PDEUXA PDEUXA added the enhancement New feature or request label Jul 17, 2024
@ion-elgreco ion-elgreco changed the title Read Specific Field to benefit from parquet filter pushdown Slice pushdown for load_cdf Jul 22, 2024
@ion-elgreco ion-elgreco changed the title Slice pushdown for load_cdf Projection pushdown for load_cdf Jul 25, 2024
@ion-elgreco ion-elgreco mentioned this issue Jul 25, 2024
Merged
ion-elgreco added a commit that referenced this issue Jul 25, 2024
@ion-elgreco
feat(python, rust): add projection in CDF reads (#2704)
4253770 
# Description
Adds columns field to CDF builder

# Related Issue(s)
- closes #2681
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feat(python, rust): add projection in CDF reads ion-elgreco/delta-rs
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