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Yes, this problem is causing me a lot of heartburn. I am using Sybase which pukes on column aliases inside a subquery. I was trying to get around this with:
subquery1.setProjection(Projections.sqlProjection("1", null, null)); // causes NullPointerException
or by not using a projection at all. // causes NullPointerException
I, too, am using Subqueries.exists(). // projection shouldn't be needed
Every valid projection I set on the subquery (even a rowCount) results in a column alias which Sybase cannot handle.