Horton

Re: WIP: extensible enums

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andrew Dunstan <andrew@dunslane.net>
Cc: Dean Rasheed <dean.a.rasheed@gmail.com>, Robert Haas <robertmhaas@gmail.com>, pgsql-hackers@postgresql.org
Date: 2010-10-17T14:38:51Z
Lists: pgsql-hackers 
Andrew Dunstan <andrew@dunslane.net> writes:
> On 10/17/2010 05:30 AM, Dean Rasheed wrote:
>> I just thought of another corner case, which can lead to a crash. The
>> comparison code assumes that the number of elements in the enumeration
>> is constant during a query, but that's not necessarily the case.
>> ...
>> Of course that's a pathalogical example, but we should protect against
>> it, preferrably without compromising performance in more normal cases.

> Yeah, good point. But how do we manage that?

Why is it crashing?  I can see that this sort of thing might lead to
nonsensical answers, but a crash is harder to understand.

			regards, tom "haven't read the patch" lane