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help / color / mirror / Atom feedFrom: Junwang Zhao <[email protected]>
To: David Rowley <[email protected]>
Cc: Alexander Lakhin <[email protected]>
Cc: Tender Wang <[email protected]>
Cc: Andres Freund <[email protected]>
Cc: John Naylor <[email protected]>
Cc: PostgreSQL Developers <[email protected]>
Subject: Re: More speedups for tuple deformation
Date: Wed, 1 Apr 2026 13:13:30 +0800
Message-ID: <CAEG8a3KNcN38Q016sAGwXWokFjj-Niq4Sy1PuGbeFQVkOP1Y6g@mail.gmail.com> (raw)
In-Reply-To: <CAApHDvqEavE+Fd=nmaBZmEHDugKsQhM=DmG-crr8MA5U6DNo_A@mail.gmail.com>
References: <CAApHDvpbntG7V3_EsZ+w-V=jU-y8rFmv9RB1EDJm4sxKno-4UA@mail.gmail.com>
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<CANWCAZabO1oj+khF+YNVpmkTQwRRyNJesbsBhRFL5emZJh3tow@mail.gmail.com>
<lzgoxzbh2gel5w362revuwaecrsbjr44kjdzrewuejugcodkeq@ixymojwnylsy>
<CAApHDvodSVBj3ypOYbYUCJX+NWL=VZs63RNBQ_FxB_F+6QXF-A@mail.gmail.com>
<rbxc2qqhsvzxpukgd36caoa4ydgn5r22fxktxanrkn6nobg7j6@27b4vogohgu2>
<CAApHDvpWQn8sXDYpSNNpieJW-UTG4Nf4TVjT8ew64L073hz-Fw@mail.gmail.com>
<mq6ddpgctt42srolsvo5kph2s6shfg62meb7i5fbg6n3s73zju@2n7gviiyga3h>
<uhqul2ryci4tyg5ylddjrmf4kybzwb7m5z7rmurhhjp37vrn5f@zgxil7egr62n>
<CAApHDvq21qQigiM6z2YgadFusQC_pfEYP8D=oQCrwJ_kKzcqDg@mail.gmail.com>
<CAApHDvpdB1t7LCgH8=KOKC6VBb2rsEbaas0FiXo5awsRgCsDxQ@mail.gmail.com>
<CAEG8a3KeKcZxJsH9nL+D1JzC4Ekx51ps7-1ZGWkwdXbPS5jTXw@mail.gmail.com>
<CAApHDvqp_DGNkz3Rr29hPuSYdai5c_32mWSv2inrW2ufsE+qZQ@mail.gmail.com>
<CAHewXNnb-s_=VdVUZ9h7dPA0u3hxV8x2aU3obZytnqQZ_MiROA@mail.gmail.com>
<[email protected]>
<CAApHDvqEavE+Fd=nmaBZmEHDugKsQhM=DmG-crr8MA5U6DNo_A@mail.gmail.com>
On Wed, Apr 1, 2026 at 11:35 AM David Rowley <[email protected]> wrote:
>
> On Wed, 1 Apr 2026 at 15:00, Alexander Lakhin <[email protected]> wrote:
> > I've also found an assertion failure:
> > SELECT JSON_ARRAY(VALUES (('', '')));
> >
> > triggers:
> > TRAP: failed Assert("attlen > 0 || attlen == -1"), File: "heaptuple.c", Line: 598, PID: 2582495
> >
> > Could you have a look, please?
>
> Thanks. Looking...
The parser transforms '' (or any cstring) into Const with UNKNOWNOID.
When building the tuple descriptor in ExecTypeFromExprList,
TupleDescInitEntry uses UNKNOWNOID to populate the attribute entry,
thus the failure in nocachegetattr.
Therefore, the assertion should be addressed by removing the pg_assume,
since this case can occur.
Just trying to learn through analysis, might be incorrect. Let's wait for
David's fix.
>
> David
>
>
--
Regards
Junwang Zhao
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Subject: Re: More speedups for tuple deformation
In-Reply-To: <CAEG8a3KNcN38Q016sAGwXWokFjj-Niq4Sy1PuGbeFQVkOP1Y6g@mail.gmail.com>
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