From 2d13dab048a7e0777875529620f81d32ce57dfd8 Mon Sep 17 00:00:00 2001
From: Andrew Dunstan
Date: Tue, 22 Aug 2023 11:57:08 -0400
Subject: Cache by-reference missing values in a long lived context

Attribute missing values might be needed past the lifetime of the tuple
descriptors from which they are extracted. To avoid possibly using
pointers for by-reference values which might thus be left dangling, we
cache a datumCopy'd version of the datum in the TopMemoryContext. Since
we first search for the value this only needs to be done once per
session for any such value.

Original complaint from Tom Lane, idea for mitigation by Andrew Dunstan,
tweaked by Tom Lane.

Backpatch to version 11 where missing values were introduced.

Discussion: https://postgr.es/m/1306569.1687978174@sss.pgh.pa.us
---
 src/tools/pgindent/typedefs.list | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/tools/pgindent')

diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index c463596ea7b..e11a650b1c3 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -2910,6 +2910,7 @@ mblen_converter
 mbverifier
 md5_ctxt
 metastring
+missing_cache_key
 mix_data_t
 mixedStruct
 mode_t
-- 
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