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In-Reply-To: <20260626.113505.1924699149453988246.ishii@postgresql.org>
Reply-To: assam258@gmail.com
From: Henson Choi <assam258@gmail.com>
Date: Sun, 28 Jun 2026 19:12:22 +0900
Message-ID: 
 <CAAAe_zCd+gzpYSsC04NsKyCJeneChVZCaBP540d0p2=c3abvvw@mail.gmail.com>
Subject: Re: Row pattern recognition
To: Tatsuo Ishii <ishii@postgresql.org>, jian.universality@gmail.com
Cc: pgsql-hackers@postgresql.org, zsolt.parragi@percona.com,
	sjjang112233@gmail.com, vik@postgresfriends.org, er@xs4all.nl,
	jacob.champion@enterprisedb.com, david.g.johnston@gmail.com,
	peter@eisentraut.org, li.evan.chao@gmail.com
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Hi Tatsuo,

Two things before the next review round.  Both aim at the same thing:
keeping the v50 diff to what RPR genuinely changes, so the next round
reviews RPR on its own merits rather than hunks that drifted in or touch
pre-existing window code.

First, the cfbot is currently red on v49 across all platforms.  The cause
is not RPR: master recently reworded the RESPECT/IGNORE NULLS error, which
left rpr_base's expected output stale, so the regression diff fails "make
check" everywhere.  That is exactly the one-line fix you already agreed to
fold in; I have posted it here as v50-0021 so the series builds green on
its own.  This one is required regardless.

Second, while going over the v49 diff against master I found several hunks
that are either unrelated to RPR or that touch pre-existing window code.  I
split them into small patches so each can be decided on its own.

Patch list
----------
Every patch in this reply.  revert-* removes the change from RPR;
optional-* re-applies the same change to master separately.

  v50-0021       cfbot build fix (required regardless)
  revert-0001    drop unrelated include and stray blank line  (required
cleanup)
  revert-0004    restore doc paragraph line wrapping          (required
cleanup)
  revert-0002    #2 drop the mark-position diagnostic         (your call)
  optional-0001  #2 land the diagnostic on master
  revert-0003    #3 restore the funcname guard                (your call)
  optional-0002  #3 land the guard removal on master
  revert-0005    #5 drop the EXCLUDE TIES tests               (your call)
  optional-0003  #5 land the tests on master

Required cleanups
-----------------
These only remove changes that crept in but have nothing to do with RPR.
I split them out so you can fold them into the feature patch; being
required cleanups, I recommend applying them:

  revert-0001    drop an unrelated "nodes/plannodes.h" include and a stray
                 blank line in eval_windowaggregates()
  revert-0004    restore the line wrapping of two pre-existing doc
                 paragraphs (advanced.sgml, ref/select.sgml)

Your call
---------
The next three touch pre-existing window code, so I would rather you decide
where each belongs.  I prepared the building blocks so you can pick any
option:

  #2  window_gettupleslot() mark-position elog -- add row positions
      v49 extended the can't-happen error with the pos/markpos values.
        (a) keep it in RPR                 -> apply neither patch
        (b) drop it                        -> apply revert-0002
        (c) land it on master separately   -> revert-0002 + optional-0001
      A tiny additive diagnostic; I lean to (c), but (a) is fine too.

  #3  funcname guard in WinCheckAndInitializeNullTreatment()
      v49 removed the "could not get function name" guard as unreachable.
        (a) keep the removal in RPR        -> apply neither patch
        (b) restore the guard, drop it     -> apply revert-0003
        (c) remove it on master separately -> revert-0003 + optional-0002
      The branch is genuinely unreachable, but it drops a deliberate guard
      in pre-existing code, so of the three this one most warrants caution.
      Preserving the guard via (b) or (c) looks safest, but I will leave the
      decision to you.

  #5  EXCLUDE TIES window-frame test coverage
      Two nth_value/last_value cases.  The accounting they exercise already
      exists on master and the tests pass without RPR, so they are not RPR
      coverage.
        (a) keep them in RPR               -> apply neither patch
        (b) land them on master separately -> revert-0005 + optional-0003
      I lean to (b).

For my part, I will carry out the deeper review against v50 with v50-0021
and revert-0001/0004 applied, plus whichever of the above you choose, as
the minimal green baseline.

Best,
Henson

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<div dir=3D"ltr"><font face=3D"monospace">Hi Tatsuo,<br><br>Two things befo=
re the next review round.=C2=A0 Both aim at the same thing:<br>keeping the =
v50 diff to what RPR genuinely changes, so the next round<br>reviews RPR on=
 its own merits rather than hunks that drifted in or touch<br>pre-existing =
window code.<br><br>First, the cfbot is currently red on v49 across all pla=
tforms.=C2=A0 The cause<br>is not RPR: master recently reworded the RESPECT=
/IGNORE NULLS error, which<br>left rpr_base&#39;s expected output stale, so=
 the regression diff fails &quot;make<br>check&quot; everywhere.=C2=A0 That=
 is exactly the one-line fix you already agreed to<br>fold in; I have poste=
d it here as v50-0021 so the series builds green on<br>its own.=C2=A0 This =
one is required regardless.<br><br>Second, while going over the v49 diff ag=
ainst master I found several hunks<br>that are either unrelated to RPR or t=
hat touch pre-existing window code. =C2=A0I<br>split them into small patche=
s so each can be decided on its own.<br><br>Patch list<br>----------<br>Eve=
ry patch in this reply. =C2=A0revert-* removes the change from RPR;<br>opti=
onal-* re-applies the same change to master separately.<br><br>=C2=A0 v50-0=
021 =C2=A0 =C2=A0 =C2=A0 cfbot build fix (required regardless)<br>=C2=A0 re=
vert-0001 =C2=A0 =C2=A0drop unrelated include and stray blank line =C2=A0(r=
equired cleanup)<br>=C2=A0 revert-0004 =C2=A0 =C2=A0restore doc paragraph l=
ine wrapping =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(required cleanup)<br>=C2=A0=
 revert-0002 =C2=A0 =C2=A0#2 drop the mark-position diagnostic =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 (your call)<br>=C2=A0 optional-0001 =C2=A0#2 land the dia=
gnostic on master<br>=C2=A0 revert-0003 =C2=A0 =C2=A0#3 restore the funcnam=
e guard =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(your call)<=
br>=C2=A0 optional-0002 =C2=A0#3 land the guard removal on master<br>=C2=A0=
 revert-0005 =C2=A0 =C2=A0#5 drop the EXCLUDE TIES tests =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 (your call)<br>=C2=A0 optional-0003 =C2=A0#=
5 land the tests on master<br><br>Required cleanups<br>-----------------<br=
>These only remove changes that crept in but have nothing to do with RPR.<b=
r>I split them out so you can fold them into the feature patch; being<br>re=
quired cleanups, I recommend applying them:<br><br>=C2=A0 revert-0001 =C2=
=A0 =C2=A0drop an unrelated &quot;nodes/plannodes.h&quot; include and a str=
ay<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0blank l=
ine in eval_windowaggregates()<br>=C2=A0 revert-0004 =C2=A0 =C2=A0restore t=
he line wrapping of two pre-existing doc<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0paragraphs (advanced.sgml, ref/select.sgml)<=
br><br>Your call<br>---------<br>The next three touch pre-existing window c=
ode, so I would rather you decide<br>where each belongs.=C2=A0 I prepared t=
he building blocks so you can pick any<br>option:<br><br>=C2=A0 #2 =C2=A0wi=
ndow_gettupleslot() mark-position elog -- add row positions<br>=C2=A0 =C2=
=A0 =C2=A0 v49 extended the can&#39;t-happen error with the pos/markpos val=
ues.<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 (a) keep it in RPR =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 -&gt; apply neither patch<br>=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 (b) drop it =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0-&gt; apply revert-0002<br>=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 (c) land it on master separately =C2=A0 -&gt; revert-0002=
 + optional-0001<br>=C2=A0 =C2=A0 =C2=A0 A tiny additive diagnostic; I lean=
 to (c), but (a) is fine too.<br><br>=C2=A0 #3 =C2=A0funcname guard in WinC=
heckAndInitializeNullTreatment()<br>=C2=A0 =C2=A0 =C2=A0 v49 removed the &q=
uot;could not get function name&quot; guard as unreachable.<br>=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 (a) keep the removal in RPR =C2=A0 =C2=A0 =C2=A0 =C2=A0-&=
gt; apply neither patch<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 (b) restore the guar=
d, drop it =C2=A0 =C2=A0 -&gt; apply revert-0003<br>=C2=A0 =C2=A0 =C2=A0 =
=C2=A0 (c) remove it on master separately -&gt; revert-0003 + optional-0002=
<br>=C2=A0 =C2=A0 =C2=A0 The branch is genuinely unreachable, but it drops =
a deliberate guard<br>=C2=A0 =C2=A0 =C2=A0 in pre-existing code, so of the =
three this one most warrants caution.<br>=C2=A0 =C2=A0 =C2=A0 Preserving th=
e guard via (b) or (c) looks safest, but I will leave the<br>=C2=A0 =C2=A0 =
=C2=A0 decision to you.<br><br>=C2=A0 #5 =C2=A0EXCLUDE TIES window-frame te=
st coverage<br>=C2=A0 =C2=A0 =C2=A0 Two nth_value/last_value cases.=C2=A0 T=
he accounting they exercise already<br>=C2=A0 =C2=A0 =C2=A0 exists on maste=
r and the tests pass without RPR, so they are not RPR<br>=C2=A0 =C2=A0 =C2=
=A0 coverage.<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 (a) keep them in RPR =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 -&gt; apply neither patch<br>=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 (b) land them on master separately -&gt; revert-00=
05 + optional-0003<br>=C2=A0 =C2=A0 =C2=A0 I lean to (b).<br><br>For my par=
t, I will carry out the deeper review against v50 with v50-0021<br>and reve=
rt-0001/0004 applied, plus whichever of the above you choose, as<br>the min=
imal green baseline.<br><br>Best,<br>Henson</font><br></div>

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