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Fix for reading exported parquet #1071

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@ilongin ilongin commented Apr 30, 2025

Fixing the issue when we read parquet file that is being created with datachain itself and already has source fields inside it. What was happening is that we were adding duplicated source fields on read and this PR avoids that even if source=True flag is set.

@ilongin ilongin linked an issue Apr 30, 2025 that may be closed by this pull request
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@ilongin tests are broken?

@ilongin should we actually rewrite source if source is True? 🤔 since the existing source is kinda wrong by now ...

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Parquet: reading exported parquet file
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