feat(collect): Collection.save() supports xlsx and json (#789) - #793
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Adds "json" (polars write_json) and "xlsx" to Collection.save formats (previously only parquet/csv, raising on anything else). xlsx uses polars write_excel with a graceful fallback to pandas to_excel, and a clear error if no Excel writer (xlsxwriter/openpyxl) is installed. Unknown formats now name the supported set. Closes #789 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
jepegit
enabled auto-merge (squash)
July 29, 2026 11:25
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Adds
jsonandxlsxtoCollection.saveformats (was parquet/csv only). xlsx uses polarswrite_excelwith a pandasto_excelfallback and a clear error when no Excel writer is installed; unknown formats now name the supported set.Tests: json round-trip, xlsx write (skips if no engine), unknown-format error.
Closes #789
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