Hello,
I've hit a bug in the GeoTools ECQL parsing. I've got a fix, but wanted
to raise the issue here before opening a pull request.
We've got a custom filter function named 'proxyId', which just hashes
the feature ID into an int. We use it for reach-back queries, so we can
save bandwidth on sending lots of feature IDs to the client. So for a
given feature returned with a proxy ID (in place of a regular ID), we
can construct a query using the default geometry and use the proxyId to
disambiguate any other features that have the same geometry. The bug
shows up in the ECQL round-trip, when querying multiple ids at once.
ECQL.toCQL turns the filter from "proxyId() = 0 OR proxyId() = 1" into
"proxyId() IN (0, 1)", which then fails to parse with ECQL.toFilter().
To fix it, I've added a check for "Function()" in the ECQLGrammar class
here:
https://github.com/geotools/geotools/blob/master/modules/library/cql/src/main/jjtree/ECQLGrammar.jjt#L469
Does that seem reasonable? If so, I'll open a formal PR.
Thanks,
Emilio
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