On Tue, Oct 28, 2025 at 08:36:33AM +0800, Chao Li wrote:
> On Oct 28, 2025, at 07:35, Michael Paquier <[email protected]> wrote:
>> On Mon, Oct 27, 2025 at 09:55:38AM -0500, Nathan Bossart wrote:
>>> /*
>>>  * DISABLE_LEADER_PARTICIPATION disables the leader's participation in
>>>  * parallel index builds.  This may be useful as a debugging aid.
>>> -#undef DISABLE_LEADER_PARTICIPATION
>>> + *#undef DISABLE_LEADER_PARTICIPATION
>>>  */
>>> 
>>> IMHO we should either remove this line or move it out of the comment.
>>> AFAICT we ordinarily don't #undef debugging stuff like this, presumably so
>>> you can change it with compile flags.
>> 
>> I would put this one on a separate line, outside the comment.  It's
>> minor, still we use this style in pg_config_manual.h.  See around
>> REALLOCATE_BITMAPSETS.
> 
> +1

Here's a patch for this.  I also changed the #undefs to #defines.

-- 
nathan
>From bf5e0e7ac895070ccb3b3cff9a550e4c14179e2b Mon Sep 17 00:00:00 2001
From: Nathan Bossart <[email protected]>
Date: Thu, 11 Dec 2025 15:26:57 -0600
Subject: [PATCH v1 1/1] fix some commented undefs

---
 src/backend/access/nbtree/nbtsort.c | 2 +-
 src/backend/utils/adt/numeric.c     | 2 +-
 src/include/executor/execdebug.h    | 6 +++---
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/backend/access/nbtree/nbtsort.c 
b/src/backend/access/nbtree/nbtsort.c
index d7695dc1108..5119db53a1b 100644
--- a/src/backend/access/nbtree/nbtsort.c
+++ b/src/backend/access/nbtree/nbtsort.c
@@ -69,8 +69,8 @@
 /*
  * DISABLE_LEADER_PARTICIPATION disables the leader's participation in
  * parallel index builds.  This may be useful as a debugging aid.
-#undef DISABLE_LEADER_PARTICIPATION
  */
+/* #define DISABLE_LEADER_PARTICIPATION */
 
 /*
  * Status record for spooling/sorting phase.  (Note we may have two of
diff --git a/src/backend/utils/adt/numeric.c b/src/backend/utils/adt/numeric.c
index 2460698df01..a42a2948121 100644
--- a/src/backend/utils/adt/numeric.c
+++ b/src/backend/utils/adt/numeric.c
@@ -48,8 +48,8 @@
  * Uncomment the following to enable compilation of dump_numeric()
  * and dump_var() and to get a dump of any result produced by make_result().
  * ----------
-#define NUMERIC_DEBUG
  */
+/* #define NUMERIC_DEBUG */
 
 
 /* ----------
diff --git a/src/include/executor/execdebug.h b/src/include/executor/execdebug.h
index e5d27fb6c9a..d999a907e77 100644
--- a/src/include/executor/execdebug.h
+++ b/src/include/executor/execdebug.h
@@ -34,22 +34,22 @@
  *             EXEC_NESTLOOPDEBUG is a flag which turns on debugging of the
  *             nest loop node by NL_printf() and ENL_printf() in nodeNestloop.c
  * ----------------
-#undef EXEC_NESTLOOPDEBUG
  */
+/* #define EXEC_NESTLOOPDEBUG */
 
 /* ----------------
  *             EXEC_SORTDEBUG is a flag which turns on debugging of
  *             the ExecSort() stuff by SO_printf() in nodeSort.c
  * ----------------
-#undef EXEC_SORTDEBUG
  */
+/* #define EXEC_SORTDEBUG */
 
 /* ----------------
  *             EXEC_MERGEJOINDEBUG is a flag which turns on debugging of
  *             the ExecMergeJoin() stuff by MJ_printf() in nodeMergejoin.c
  * ----------------
-#undef EXEC_MERGEJOINDEBUG
  */
+/* #define EXEC_MERGEJOINDEBUG */
 
 /* ----------------------------------------------------------------
  *             #defines controlled by above definitions
-- 
2.39.5 (Apple Git-154)

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