feat: enable path expressions in infix filter after exists predicate
#875
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if a path expression is detected in a infix filter of an association which follows an `exists` predicate, we add the filter expression as a whole to the `exists (<subquery>)` and then recursively transform it with `cqn4sql` to get the proper joins. Usually, transforming the `exists <subquery>` is not necessary, because the `where` clause is already well formed -> there is a mechanism to flag a path expression in this special case as such. this is just a simple poc… more tests need to be added. - `exists books[genre.name = 'fiction' and exists author]` -> mixed with sibiling `exists` - `exists books[uppercase(genre.name) = 'FICTION']` -> detect path expressions anywhere
patricebender
requested review from
danjoa,
johannes-vogel,
stewsk,
BobdenOs,
sjvans and
David-Kunz
as code owners
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if a path expression is detected in a infix filter of an association which follows an
existspredicate, we add the filter expression as a whole to theexists (<subquery>)and then recursively transform it withcqn4sqlto get the proper joins.Usually, transforming the
exists <subquery>is not necessary, because thewhereclause is already well formed -> there is a mechanism to flag a path expression in this special case as such.this is just a simple poc… more tests need to be added.
exists books[genre.name = 'fiction' and exists author]-> mixed with sibilingexistsexists books[uppercase(genre.name) = 'FICTION']-> detect path expressions anywhereSELECT from Authors:books[genre.name = 'FICTION']→ What about scoped queries?fix: nested exists wrapped in xpr