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help / color / mirror / Atom feedFrom: Chao Li <[email protected]>
To: Alexandra Wang <[email protected]>
Cc: jian he <[email protected]>
Cc: Nikita Malakhov <[email protected]>
Cc: Vik Fearing <[email protected]>
Cc: Mark Dilger <[email protected]>
Cc: Matheus Alcantara <[email protected]>
Cc: Peter Eisentraut <[email protected]>
Cc: Andrew Dunstan <[email protected]>
Cc: Nikita Glukhov <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Cc: David E. Wheeler <[email protected]>
Subject: Re: SQL:2023 JSON simplified accessor support
Date: Fri, 29 Aug 2025 11:42:31 +0800
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAK98qZ35eF+9MZuqR4HNrmebyBFdNiNLiLZHpQPB7S7OUk-DDQ@mail.gmail.com>
References: <[email protected]>
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>
> Best,
> Alex
> <v14-0002-Allow-Generic-Type-Subscripting-to-Accept-Dot-No.patch><v14-0003-Export-jsonPathFromParseResult.patch><v14-0001-Allow-transformation-of-only-a-sublist-of-subscr.patch><v14-0005-Implement-read-only-dot-notation-for-jsonb.patch><v14-0007-Implement-jsonb-wildcard-member-accessor.patch><v14-0006-Implement-Jsonb-subscripting-with-slicing.patch><v14-0004-Extract-coerce_jsonpath_subscript.patch>
I am trying to split different topics to different email to keep every issue to be focused.
I also have a suggestion.
If I do:
```
— s1
select (t.data)['con']['a'][1]['b']['c']['d'] from test_jsonb_types t;
—s2
select (t.data).con.a[1].b['c'].d from test_jsonb_types t;
```
The two statements are actually identical. But they generate quite different rewritten query trees. S1’s rewritten tree is much simpler than s2’s. However, their plan trees are the same.
I think we can convert string indirections to indices indirection first before transform indirections, so that the two SQLs will generate the same rewritten query tree, which would simplify the code logic of rewriting query tree and the planner.
Best regards,
--
Chao Li (Evan)
HighGo Software Co., Ltd.
https://www.highgo.com/
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Subject: Re: SQL:2023 JSON simplified accessor support
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