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allow to read non-standard CSV #326

Merged
merged 5 commits into from
May 25, 2021
Merged

allow to read non-standard CSV #326

merged 5 commits into from
May 25, 2021

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kazuk
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@kazuk kazuk commented May 19, 2021

Which issue does this PR close?

Closes #315.

Rationale for this change

What changes are included in this PR?

Reader::from_reader split into Reader::build_csv_reader, Reader::from_csv_reader.

Reader::build_csv_reader builds csv_crate::Reader,with all CSV reader options.
Rader::from_csv_reader builds arrow::csv::reader::Reader for csv_crate::Reader.

add fn infer_file_schema_with_csv_options .

change infer_file_schema calls infer_file_schema_with_csv_options with default options.

add fn infer_reader_schema_with_csv_options.
change infer_reader_schema calls infer_reader_schema with default options.

add escape quote terminator to ReaderBuilder

ReaderBuilder::build uses added options.

Are there any user-facing changes?

currently minimized API change.

  • add fn ReaderBuilder::escape
  • add fn ReaderBuilder::quote
  • add fn ReaderBuilder::terminator

please concider make public for fn infer_file_schema_with_csv_options, infer_reader_schema_with_csv_options , Reader::build_csv_reader , Reader::from_csv_reader.

kazuk added 3 commits May 19, 2021 11:21
@kazuk
refactor Reader::from_reader
0851405 
split into build_csv_reader, from_csv_reader
add escape, quote, terminator arg to build_csv_reader
@kazuk
add escape,quote,terminator field to ReaderBuilder
1d154c9 
schema inference support for non-standard CSV

  add fn infer_file_schema_with_csv_options
  add fn infer_reader_schema_with_csv_options

ReaderBuilder support for non-standard CSV

add escape, quote, terminator field
add fn with_escape, with_quote, with_terminator
change ReaderBuilder::build for non-standard CSV
@kazuk
minimize API change
4bf2e0c
alamb
alamb reviewed May 21, 2021
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Thank you for the contribution @kazuk

This code looks really nice and clean. 👍

The only thing that I think is missing from this PR is some basic tests -- specifically to show everything hooked together properly and the options get to the csv reader.

I think such tests would be of most value to ensure that as we change this code in the future, we don't accidentally break this new functionality. Give we are delegating to the implementation in the csv reader crate I don't think we need to test a large number of corner cases -- just that we can read a CSV file with a non default escape, quote and terminator character

Thanks again!

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Codecov Report

Merging #326 (4bf2e0c) into master (c863a2c) will decrease coverage by 0.02%.
The diff coverage is 66.66%.

Impacted file tree graph

@@            Coverage Diff             @@
##           master     #326      +/-   ##
==========================================
- Coverage   82.52%   82.50%   -0.03%     
==========================================
  Files         162      162              
  Lines       44007    44036      +29     
==========================================
+ Hits        36316    36331      +15     
- Misses       7691     7705      +14
Impacted Files Coverage Δ
arrow/src/csv/reader.rs 86.97% <66.66%> (-1.39%) ⬇️
arrow/src/array/transform/boolean.rs 76.92% <0.00%> (-7.70%) ⬇️
parquet/src/encodings/encoding.rs 94.85% <0.00%> (-0.20%) ⬇️

Continue to review full report at Codecov.

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@kazuk
add tests
d37a357 
add #[test] fn test_non_std_quote
add #[test] fn test_non_std_escape
add #[test] fn test_non_std_terminator
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kazuk commented May 24, 2021

Thank you for review.

The only thing that I think is missing from this PR is some basic tests -- specifically to show everything hooked together properly and the options get to the csv reader.

I add a basic tests for detects feature broken.

alamb
alamb approved these changes May 24, 2021
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Looks great to me -- thank you @kazuk

@alamb alamb added arrow Changes to the arrow crate enhancement Any new improvement worthy of a entry in the changelog labels May 24, 2021
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alamb commented May 24, 2021 •
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The MIRI CI check is not related to this PR (edit #345)

However, the lint failure seems to be: https://github.com/apache/arrow-rs/pull/326/checks?check_run_id=2658268180

I think it can be resolved by running cargo fmt locally and then pushing the result.

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kazuk commented May 24, 2021

oh!, Thanks.

I run cargo fmt and push.

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alamb commented May 25, 2021

The MIRI failure is unrelated to this PR: #345

@alamb alamb merged commit 1d72b26 into apache:master May 25, 2021
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alamb commented May 25, 2021

Thanks again @kazuk

@kazuk kazuk mentioned this pull request Jun 3, 2021
Closed
alamb pushed a commit that referenced this pull request Jun 4, 2021
@kazuk @alamb
allow to read non-standard CSV (#326)
5168537 
* refactor Reader::from_reader

split into build_csv_reader, from_csv_reader
add escape, quote, terminator arg to build_csv_reader

* add escape,quote,terminator field to ReaderBuilder

schema inference support for non-standard CSV

  add fn infer_file_schema_with_csv_options
  add fn infer_reader_schema_with_csv_options

ReaderBuilder support for non-standard CSV

add escape, quote, terminator field
add fn with_escape, with_quote, with_terminator
change ReaderBuilder::build for non-standard CSV

* minimize API change

* add tests

add #[test] fn test_non_std_quote
add #[test] fn test_non_std_escape
add #[test] fn test_non_std_terminator

* apply cargo fmt
@alamb alamb mentioned this pull request Jun 4, 2021
Merged
alamb added a commit that referenced this pull request Jun 5, 2021
@alamb @kazuk
allow to read non-standard CSV (#326) (#407)
c928d57 
* refactor Reader::from_reader

split into build_csv_reader, from_csv_reader
add escape, quote, terminator arg to build_csv_reader

* add escape,quote,terminator field to ReaderBuilder

schema inference support for non-standard CSV

  add fn infer_file_schema_with_csv_options
  add fn infer_reader_schema_with_csv_options

ReaderBuilder support for non-standard CSV

add escape, quote, terminator field
add fn with_escape, with_quote, with_terminator
change ReaderBuilder::build for non-standard CSV

* minimize API change

* add tests

add #[test] fn test_non_std_quote
add #[test] fn test_non_std_escape
add #[test] fn test_non_std_terminator

* apply cargo fmt

Co-authored-by: kazuhiko kikuchi <[email protected]>
@alamb alamb mentioned this pull request Jun 10, 2021
Merged
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add with_escape for csv::ReaderBuilder
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@kazuk @codecov-commenter @alamb