From: Tom Lane <tgl@sss.pgh.pa.us>
To: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Cc: tanghy.fnst@fujitsu.com
Cc: smithpb2250@gmail.com
Cc: peter.eisentraut@enterprisedb.com
Cc: david.zhang@highgo.ca
Cc: pgsql-hackers@lists.postgresql.org
Subject: Re: Support tab completion for upper character inputs in psql
Date: Fri, 23 Apr 2021 00:17:35 -0400
Message-ID: <1282887.1619151455@sss.pgh.pa.us> (raw)
In-Reply-To: <20210423.123407.440405986257584017.horikyota.ntt@gmail.com>
References: <OS0PR01MB61131A4347D385F02F60E123FB469@OS0PR01MB6113.jpnprd01.prod.outlook.com>
<20210423.115812.900808736988307020.horikyota.ntt@gmail.com>
<1280270.1619147839@sss.pgh.pa.us>
<20210423.123407.440405986257584017.horikyota.ntt@gmail.com>
Kyotaro Horiguchi <horikyota.ntt@gmail.com> writes:
> At Thu, 22 Apr 2021 23:17:19 -0400, Tom Lane <tgl@sss.pgh.pa.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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Subject: Re: Support tab completion for upper character inputs in psql
In-Reply-To: <1282887.1619151455@sss.pgh.pa.us>
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