afs commented on issue #1369:
URL: https://github.com/apache/jena/issues/1369#issuecomment-1147222431
`OpAsQuery` is not a perfect reversal of the process of compiling the query
to algebra. It aims to produce equivalent queries - same output. It has to spot
patterns because `SELECT (expr as ?var)` and `SELECT * { ... BIND (expr as
?var)}` are the same algebra.
When translating algebra to syntax, `OpAsQuery` is spotting this pattern. If
you want all the `BIND`, use `SELECT *`.
`SELECT (?x AS ?y) (?y AS ?z) {}` has two variables, whereas `SELECT ?z {}`
has one. It's a different query.
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