Re: BUG #14245: Segfault on weird to_tsquery

David Kellum <david(at)gravitext(dot)com> writes:
> On Tue, Jul 12, 2016 at 12:42 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> Note that while crashing is certainly not good, the pre-9.6 behavior
>> can hardly be called correct either. What happened to 'a'?

> 'a' is a stopword, dropped by to_tsquery() as described here:

Ah! OK, so it's probably necessary to have a stopword there in order
to break it.

BTW, all these variants also crash:

select to_tsquery('!(a | !b) & c') as tsquery;
select to_tsquery('!( !b & a) & c') as tsquery;
select to_tsquery('!( !b | a) & c') as tsquery;

regards, tom lane