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Re: Review: listagg aggregate

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Hitoshi Harada <umi.tanuki@gmail.com>
Cc: Pavel Stehule <pavel.stehule@gmail.com>, Robert Haas <robertmhaas@gmail.com>, Takahiro Itagaki <itagaki.takahiro@oss.ntt.co.jp>, "David E. Wheeler" <david@kineticode.com>, "pgsql-hackers@postgresql.org Hackers" <pgsql-hackers@postgresql.org>
Date: 2010-01-28T17:20:45Z
Lists: pgsql-hackers 
Hitoshi Harada <umi.tanuki@gmail.com> writes:
> What about get_fn_expr_arg_stable() to check if the argument is stable
> during aggregate?

Seems quite expensive (possible catalog lookups) and there still isn't
any strong argument why we should bother.

			regards, tom lane