Subject: [PATCH v1] Fix floating-point noise in pg_stat_us_to_ms()

From: Bertrand Drouvot <[email-masked]>
Date: Mon, 29 Jun 2026 06:31:58 +0000

Multiplying by 0.001 can produce trailing-digit noise in displayed
values (for example 0.009000000000000001 instead of 0.009, should extra_float_digits
not being set to 0) because 0.001 cannot be represented exactly in binary floating
point.

Use division by 1000.0 instead as it is the most common way to deal with such
computation in the code tree.

Author: Bertrand Drouvot <[email-masked]>
---
 src/backend/utils/adt/pgstatfuncs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 100.0% src/backend/utils/adt/

diff --git a/src/backend/utils/adt/pgstatfuncs.c b/src/backend/utils/adt/pgstatfuncs.c
index 6f9c9c72de5..1e5f8293b28 100644
--- a/src/backend/utils/adt/pgstatfuncs.c
+++ b/src/backend/utils/adt/pgstatfuncs.c
@@ -1457,7 +1457,7 @@ pgstat_get_io_time_index(IOOp io_op)
 static inline double
 pg_stat_us_to_ms(PgStat_Counter val_ms)
 {
-	return val_ms * (double) 0.001;
+	return (double) val_ms / 1000.0;
 }
 
 /*
-- 
2.34.1

--TXuqZKQhWXLuSKvO--