| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com> |
| Cc: | tanghy(dot)fnst(at)fujitsu(dot)com, smithpb2250(at)gmail(dot)com, peter(dot)eisentraut(at)enterprisedb(dot)com, david(dot)zhang(at)highgo(dot)ca, pgsql-hackers(at)lists(dot)postgresql(dot)org |
| Subject: | Re: Support tab completion for upper character inputs in psql |
| Date: | 2021-04-23 04:17:35 |
| Message-ID: | 1282887.1619151455@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com> writes:
> At Thu, 22 Apr 2021 23:17:19 -0400, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote in
>> Doesn't seem like a good idea, because that locks us into an assumption
>> that the downcasing conversion doesn't change the string's physical
>> length. There are a lot of counterexamples to that :-(. I'm not sure
> Mmm. I didn't know of that.
The two examples I know of offhand are in German (eszett "ß" downcases to
"ss") and Turkish (dotted "Í" downcases to "i", likewise dotless "I"
downcases to "ı"; one of each of those pairs is an ASCII letter, the
other is not). Depending on which encoding is in use, these
transformations *could* be the same number of bytes, but they could
equally well not be. There are probably other examples.
regards, tom lane
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