Date: Thu, 6 Aug 2020 23:05:55 -0500
From: Justin Pryzby <pryzby@telsasoft.com>
To: Amit Langote <amitlangote09@gmail.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, Andy Fan <zhihui.fan1213@gmail.com>,
	Robert Haas <robertmhaas@gmail.com>,
	"pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Subject: Re: FailedAssertion("pd_idx == pinfo->nparts", File:
 "execPartition.c", Line: 1689)
Message-ID: <20200807040555.GD20473@telsasoft.com>
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On Fri, Aug 07, 2020 at 12:16:11PM +0900, Amit Langote wrote:
> Curiously, Justin mentioned upthread that the crash occurred during
> BIND of a prepared query, so it better had been that a custom plan was
> being executed, because a generic one based on fewer partitions would
> be thrown away due to A.I.M. invoked during AcquireExecutorLocks().

Well this statement should only be executed once, and should be using
PQexecParams and not PQexecPrepared (pygresql: pg.DB().query_prepared()).

(gdb) p portal->name
$30 = 0xf03238 ""

(gdb) p portal->prepStmtName 
$31 = 0x0

(gdb) p *portal->cplan
$24 = {magic = 953717834, stmt_list = 0x682ec38, is_oneshot = false, is_saved = true, is_valid = true, planRoleId = 16554, dependsOnRole = false, saved_xmin = 0, generation = 1, refcount = 1, context = 0x682dfd0}

I'm not sure why is_oneshot=false, though...

-- 
Justin