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From: Erik Rijkers <[email protected]>
To: [email protected]
To: [email protected]
To: PG Doc comments form <[email protected]>
Subject: Re: Typo in DATATYPE-JSONPATH
Date: Fri, 16 Apr 2021 08:11:53 +0200 (CEST)
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

> On 2021.04.15. 22:04 PG Doc comments form <[email protected]> wrote:
>  
> Page: https://www.postgresql.org/docs/13/datatype-json.html
> Description:
> 
> Hello,
> 
> On the DATATYPE-JSONPATH page:
> https://www.postgresql.org/docs/13/datatype-json.html#DATATYPE-JSONPATH
> 
> There is a line that shows that GIN indexes support `@@` and `@?` operators
> for json matching, then there are two examples trying to show both
> operators. However both examples use the `@@` operator.
> 
> Examples from the doc:
> 
> SELECT jdoc->'guid', jdoc->'name' FROM api WHERE jdoc @@ '$.tags[*] ==
> "qui"';
> SELECT jdoc->'guid', jdoc->'name' FROM api WHERE jdoc @@ '$.tags[*] ? (@ ==
> "qui")';
> 
> I think the second example should be using the `@?` operator so that both
> sample queries do the same thing but with the different operator types. So
> the second example should read:
> 
> SELECT jdoc->'guid', jdoc->'name' FROM api WHERE jdoc @? '$.tags[*] ? (@ ==
> "qui")';
>
> Thank you,
> Ben

FWIW, I agree with this and already sent a doc-patch [1], which is be applied from 12, 13, and master. 

Erik


[1] https://www.postgresql.org/message-id/[email protected]

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