[BUGS] BUG #14552: tsquery converts AND operator into OR when nested insideOR operations

The following bug has been logged on the website:

Bug reference:      14552
Logged by:          Bjorn Linder
Email address:      bjorn@eventmy.com
PostgreSQL version: 9.4.5
Operating system:   OS 10.11.6
Description:

Working correctly, no results: 
SELECT ts_rank(to_tsvector('lets eat a cat'), ('fat & bat | rat'::tsquery &&
'cat'::tsquery));
 ts_rank
---------
   1e-20
(1 row)

Should also yield no results:
SELECT ts_rank(to_tsvector('lets eat a fat cat'), ('fat & bat |
rat'::tsquery && 'cat'::tsquery));
  ts_rank
-----------
 0.0991032
(1 row)

Is this intended behavior? Is there a recommended way to nest AND operators
inside OR operations? The relevant documentation looks to be the same for
newer versions so I'm assuming this behavior hasn't been changed between
versions - let me know. Thanks!


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