From: PG Doc comments form <noreply@postgresql.org>
To: pgsql-docs@lists.postgresql.org
Cc: splarv@ya.ru
Subject: ^@ operator vs start_with function
Date: Tue, 31 Oct 2023 12:41:13 +0000
Message-ID: <169875607385.1769272.18010444720249291234@wrigleys.postgresql.org> (raw)
The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/16/functions-string.html
Description:
https://www.postgresql.org/docs/16/functions-string.html
Said
text ^@ text → boolean
Returns true if the first string starts with the second string (equivalent
to the starts_with() function).
'alphabet' ^@ 'alph' → t
This is not true equivalent, because ^@ can be accelerated by special
SP-GiST index
https://www.postgresql.org/docs/14/spgist-builtin-opclasses.html
while function starts_with() perhaps no.
Thus need to mention in the description of ^@ it can be accelerated by the
special index with link to it. And in the description on start_with() need
to mention that alternative ^@ is better, because it can be accelerated by
index, while the function is not.
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To: pgsql-docs@postgresql.org
Cc: noreply@postgresql.org, pgsql-docs@lists.postgresql.org, splarv@ya.ru
Subject: Re: ^@ operator vs start_with function
In-Reply-To: <169875607385.1769272.18010444720249291234@wrigleys.postgresql.org>
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