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From: David E. Wheeler <[email protected]>
To: Tom Lane <[email protected]>
Cc: [email protected]
Subject: Re: JSON Path and GIN Questions
Date: Sun, 17 Sep 2023 18:09:36 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
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On Sep 17, 2023, at 12:20, Tom Lane <[email protected]> wrote:

> After thinking about it for awhile, I think we need some more
> discursive explanation of what's allowed, perhaps along the lines
> of the attached.  (I still can't shake the feeling that this is
> duplicative; but I can't find anything comparable until you get
> into the weeds in Section V.)
> 
> I put the new text at the end of section 11.1, but perhaps it
> belongs a little further up in that section; it seems more
> important than some of the preceding paras.

I think this is useful, but also that it’s worth calling out explicitly that functions do not count as indexable operators. True by definition, of course, but I at least had assumed that since an operator is, in a sense, syntax sugar for a function call, they are in some sense the same thing.

A header might be useful, something like “What Counts as an indexable expression”.

Best,

David



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