| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | tswan(at)idigx(dot)com |
| Cc: | "Bill Moran" <wmoran(at)potentialtech(dot)com>, pgsql-general(at)postgresql(dot)org, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: [HACKERS] Shouldn't B'1' = 1::bit be true? |
| Date: | 2004-03-10 19:06:00 |
| Message-ID: | 8842.1078945560@sss.pgh.pa.us |
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| Lists: | pgsql-general pgsql-hackers |
"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.
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.
regards, tom lane
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