From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
Cc: | Merlin Moncure <mmoncure(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: enum types and binary queries |
Date: | 2007-08-30 19:21:28 |
Message-ID: | 8516.1188501688@sss.pgh.pa.us |
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Lists: | pgsql-hackers pgsql-patches |
Andrew Dunstan <andrew(at)dunslane(dot)net> writes:
> Merlin Moncure wrote:
>> I noticed that enums are not available to be queried as binary through
>> the protocol.
> The trouble is that an enum doesn't have an immutable internal binary value.
> I guess we could say that the binary value is the integer offset of the
> value in the enum ordering, and translate it back on input. Providing
> the binary IO funcs shouldn't be too hard if we do that, unless I'm
> missing something.
That would be expensive to get, wouldn't it? The main point of binary
I/O is to be fast, so I'm not excited about an expensive conversion.
What if we just defined the binary format as being identical to the text
format, ie, the enum label? A bit silly but at least it would eliminate
the gotcha that binary I/O fails.
regards, tom lane
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