>From: pgsql-hackers-ow...@postgresql.org 
>[mailto:pgsql-hackers-ow...@postgresql.org] On Behalf Of Pavel Stehule
>Sent: Montag, 9. November 2015 12:49
>To: YUriy Zhuravlev
>Cc: PostgreSQL Hackers
>Subject: Re: [HACKERS] Some questions about the array.
>2015-11-09 12:36 GMT+01:00 YUriy Zhuravlev <u.zhurav...@postgrespro.ru>:
>On Sunday 08 November 2015 16:49:20 you wrote:
>> I'm not necessarily objecting to that, but it's not impossible that it
>> could break something for some existing user.  We can decide not to
>> care about that, though.
>We had an idea. You can use ~ to convert the index to the array which always
>starts with 0. Then we can use negative indexes, and you can always find the
>beginning of the array.
>we have array [-3:3]={1,2,3,4,5,6,7}
>array[~0] == 1
>array[~-1] == 7
>array[~2:~-2] == {3,4,5,6}
>What do you think?


~ is the bitwise NOT operator.
so array[~n:~m] has a current meaning. Not very useful though.
It would be better to choose another character.

my 2 pence,

Marc Mamin

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