From: | "Thomas Swan" <tswan(at)idigx(dot)com> |
---|---|
To: | "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | tswan(at)idigx(dot)com, "Bill Moran" <wmoran(at)potentialtech(dot)com>, pgsql-general(at)postgresql(dot)org, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: [GENERAL] Shouldn't B'1' = 1::bit be true? |
Date: | 2004-03-10 23:18:55 |
Message-ID: | 48135.199.222.14.2.1078960735.squirrel@www.idigx.com |
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Lists: | pgsql-general pgsql-hackers |
<quote who="Tom Lane">
> "Thomas Swan" <tswan(at)idigx(dot)com> writes:
>> To convert low bits ot high bits you pad 0 bits on the left. To
>> convert
>> from high to low you strip bits off the left hand side. This allows
>> reasonable behavior.
>
> Unfortunately, the SQL spec is perfectly clear that you pad or strip
> zero bits on the *right* of the bit string. We cannot change that.
>
I was completely unaware of that fact. *must dig a deeper hole*
> It might have been better if we had defined int<->bit casts to treat
> the first bit of the bit string as the LSB of the integer. But we
> didn't, and it's probably too big a change to consider.
>
It would be a big change at least in the 7.x series. Maybe the change
could be tabled to an 8.x release.
Thomas
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