jaydoane commented on PR #4458:
URL: https://github.com/apache/couchdb/pull/4458#issuecomment-1466811380
> I am still new to this area but I believe introduction of op_regex itself
will not cause any problems with upgrades. The reason is that it is part of an
internal data structure that is not shared between nodes during the evaluation
(not passed around as a message), it is more like a helper to implement the
selector-to-Lucene-query translation which happens in a single place.
This is exactly what I was unsure about, especially with Mike's recent
optimization to push selectors to the individual shards. I could have added
some debug logging to prove to myself it was safe, but I'm happy to hear your
assurances!
> The only potential problem I see in mixed-version environments is that one
may node handle the given query differently due to the induced change in the
index selection process
Yes, I noticed that on node1 with your fix, it returned the document as
expected, but on the other nodes, it still returned
```json
{
"docs": [],
"bookmark": "g2o"
}
```
which seems expected as well :)
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