nickva opened a new pull request, #5331:
URL: https://github.com/apache/couchdb/pull/5331
Previously, if users had invalid ddocs in the cluster, for instance
something like `_design/`, the scanner would crash when transforming them into
`#doc{}` records. That happened because the `couch_doc` function would
automatically revalidate them: check max doc length ID, attachments format,
revision format, doc ID format, etc. Which altogether silly, since they are
already saved in our cluster.
So, to avoid wasting resources revalidating existing documents, and crashing
the scanner process, use a much simpler function to transform the ddocs: make a
new `#doc{}` record with the ID and body by throwing away all the "special" doc
fields we don't care about (`_rev`, `_conflicts`, ...).
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