kosiew opened a new pull request, #981:
URL: https://github.com/apache/datafusion-python/pull/981
# Which issue does this PR close?
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Closes #978.
# Rationale for this change
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the issue then this section is not needed.
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Currently, the write_parquet method defaults to "uncompressed" Parquet
files, which can lead to inefficient storage and slower performance during I/O
operations. This change sets the default compression method to "ZSTD", a modern
compression algorithm that provides an excellent balance of compression speed
and ratio. Additionally, it introduces a default compression level of 3 for
ZSTD, which is optimal for many use cases.
# What changes are included in this PR?
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sometimes worth providing a summary of the individual changes in this PR.
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Updated the default compression parameter in the write_parquet method from
"uncompressed" to "ZSTD".
Introduced a default compression level of 3 for ZSTD if no level is
specified.
Added validation to ensure the compression level for ZSTD falls within the
valid range (1 to 22) and raises a ValueError otherwise.
Updated the docstring to clarify the default values and provide guidance for
users on compression levels.
# Are there any user-facing changes?
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updated before approving the PR.
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Yes:
The default behavior of write_parquet now compresses output files using ZSTD
with a default compression level of 3, instead of leaving files uncompressed.
Users specifying an invalid compression level for ZSTD will now encounter a
ValueError.
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