Github user afs commented on the issue:
https://github.com/apache/jena/pull/212
Revision to `deleteFrom`: loop on src if (srcSize < 1000 || dstSize >
2*srcSize)
That is, when dst is small, do the loop/contains thing.
This is more conservative and so less disturbing existing code but catches,
I hope, the case of small destination (target) graph, typically in-memory, and
large src graph (some large database).
1000 is a guess - 10,000 is better maybe?
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