afs commented on issue #1615:
URL: https://github.com/apache/jena/issues/1615#issuecomment-1312835418
> * OPTIONAL { SERVICE <loop:> { X } } becomes OpConditional which results
in an exception during algebra-to-syntax reversal in OpAsQuery.
Unrelated.
Whether perfect reversal is possible isn't clear - some kind of reversal
isn't looking too hard but there's an interaction with LeftJoin conditions
(expressions) so query equality round-trip is unlikely to be a simple matter to
provide.
You'd maybe better working with unoptimized algebra. Ultimately: optimized
=> less likely OpAsQuery can reverse an algebra expression.
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