GH-39857: [C++] Improve error message for "chunker out of sync" condition#39892
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pitrou merged 2 commits intoapache:mainfrom Feb 6, 2024
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GH-39857: [C++] Improve error message for "chunker out of sync" condition#39892pitrou merged 2 commits intoapache:mainfrom
pitrou merged 2 commits intoapache:mainfrom
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bkietz
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cpp/src/arrow/csv/parser_test.cc
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After merging your PR, Conbench analyzed the 5 benchmarking runs that have been run so far on merge-commit a6e577d. There were no benchmark performance regressions. 🎉 The full Conbench report has more details. It also includes information about 4 possible false positives for unstable benchmarks that are known to sometimes produce them. |
dgreiss
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Feb 19, 2024
… condition (apache#39892) ### Rationale for this change When writing the CSV reader, we thought that the parser not finding the same line limits as the chunker should never happen, hence the terse "chunker out of sync" error message. It turns out that, if the input contains multiline cell values and the `newlines_in_values` option was not enabled, the chunker can happily delimit a block on a newline that's inside a quoted string. The parser will then see truncated data and will stop parsing, yielding a parsed size that's smaller than the first block (see added comment in the code). ### What changes are included in this PR? * Add some parser tests that showcase the condition encountered in apacheGH-39857 * Improve error message to guide users towards the solution ### Are these changes tested? There's no functional change, the error message itself isn't tested. ### Are there any user-facing changes? No. * Closes: apache#39857 Authored-by: Antoine Pitrou <antoine@python.org> Signed-off-by: Antoine Pitrou <antoine@python.org>
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Rationale for this change
When writing the CSV reader, we thought that the parser not finding the same line limits as the chunker should never happen, hence the terse "chunker out of sync" error message.
It turns out that, if the input contains multiline cell values and the
newlines_in_valuesoption was not enabled, the chunker can happily delimit a block on a newline that's inside a quoted string. The parser will then see truncated data and will stop parsing, yielding a parsed size that's smaller than the first block (see added comment in the code).What changes are included in this PR?
Are these changes tested?
There's no functional change, the error message itself isn't tested.
Are there any user-facing changes?
No.