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 <CAMbWs4_0_DmnVc=oHbkqOCMnwwdM5GUDZzioPA+o4-WTsNnYSQ@mail.gmail.com>
From: Richard Guo <guofenglinux@gmail.com>
Date: Fri, 3 Jul 2026 12:06:45 +0900
Message-ID: 
 <CAMbWs4-b2By5XFEn-_ZJKgN4-8SBhAoRZJrt4gwmM2ctOQzAyw@mail.gmail.com>
Subject: Re: EXPLAIN (VERBOSE) fails with for JSON_ARRAYAGG/JSON_OBJECTAGG +
 window function
To: Thom Brown <thom@linux.com>
Cc: pgsql-bugs <pgsql-bugs@postgresql.org>
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--000000000000a9b7a80655ac37a4
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On Fri, Jul 3, 2026 at 7:10=E2=80=AFAM Richard Guo <guofenglinux@gmail.com>=
 wrote:
> Reproduced here.  get_json_agg_constructor() expects that ctor->func
> is Aggref or WindowFunc, but what it gets here is a Var.
>
> This is because the query has both window functions and grouped
> aggregates.  make_window_input_target() flattens the final tlist using
> pull_var_clause, which pulls the Aggref out of its JsonConstructorExpr
> wrapper.  Then fix_upper_expr() matches that inner Aggref against the
> Agg subplan's tlist and replaces it with an OUTER Var.

Here is the patch.  It's a bit annoying that the original JSON agg
syntax then appears nowhere in the EXPLAIN output.  All we get is the
bare jsonb_agg_strict Aggref.

 WindowAgg
   Output: g, (jsonb_agg_strict(name)), row_number() OVER w1
   Window: w1 AS (ROWS UNBOUNDED PRECEDING)
   ->  HashAggregate
         Output: g, jsonb_agg_strict(name)

The reason is that the JsonConstructorExpr wrapper and the Aggref it
wraps end up in different plan nodes, and neither alone suffices to
reconstruct the syntax.

I had an attempt to reconstruct the JSON syntax for the WindowAgg node
by leveraging resolve_special_varno(), and that works.  But I don't
know how to do that for the HashAggregate node, because the
JsonConstructorExpr wrapper simply doesn't exist at that plan level.
Maybe we can hack the planner to make make_window_input_target() keep
the JsonConstructorExpr together with its Aggref.  But I think that is
too invasive and it changes which node evaluates the wrapper.

So that attempt ended up with:

 WindowAgg
   Output: g, JSON_ARRAYAGG(name RETURNING jsonb), row_number() OVER w1
   Window: w1 AS (ROWS UNBOUNDED PRECEDING)
   ->  HashAggregate
         Output: g, jsonb_agg_strict(name)

But I don't think this is good.  It fails to state the fact that the
WindowAgg doesn't compute a JSON aggregate; it passes through a value
that the HashAggregate computed.  So I gave up this idea.

- Richard

--000000000000a9b7a80655ac37a4
Content-Type: application/octet-stream;
	name="v1-0001-Fix-EXPLAIN-failure-when-deparsing-SQL-JSON-aggre.patch"
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