Use the correct PG_DETOAST_DATUM macro in BRIN

Commit 6bcda4a721 replaced PG_DETOAST_DATUM with PG_DETOAST_DATUM_PACKED
in two BRIN output functions, for minmax-multi and bloom opclasses. But
this is incorrect - the code is accessing the data through structs that
already include a 4B header, so the detoast needs to match that. But the
PACKED macro may keep the 1B header, which means the struct fields will
point to incorrect data.

Backpatch-through: 16
Discussion: https://postgr.es/m/1df00a66-db5a-4e66-809a-99b386a06d86%40enterprisedb.com

diff --git a/src/backend/access/brin/brin_bloom.c b/src/backend/access/brin/brin_bloom.c
index 80ce0becdd67aa876ed8078244c16fa7ac1c5a8e..7acc6eabc3698fe20fc9488d7fe822e3122e01c8 100644 (file)
--- a/src/backend/access/brin/brin_bloom.c
+++ b/src/backend/access/brin/brin_bloom.c
@@ -769,7 +769,7 @@ brin_bloom_summary_out(PG_FUNCTION_ARGS)
    StringInfoData str;
 
    /* detoast the data to get value with a full 4B header */
-   filter = (BloomFilter *) PG_DETOAST_DATUM_PACKED(PG_GETARG_DATUM(0));
+   filter = (BloomFilter *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
 
    initStringInfo(&str);
    appendStringInfoChar(&str, '{');

diff --git a/src/backend/access/brin/brin_minmax_multi.c b/src/backend/access/brin/brin_minmax_multi.c
index c045691819ce21f09e92965c055de3e49ddab432..3664a03f7eaaab36b88d217991ba3a00f837ed2e 100644 (file)
--- a/src/backend/access/brin/brin_minmax_multi.c
+++ b/src/backend/access/brin/brin_minmax_multi.c
@@ -3015,7 +3015,7 @@ brin_minmax_multi_summary_out(PG_FUNCTION_ARGS)
     * Detoast to get value with full 4B header (can't be stored in a toast
     * table, but can use 1B header).
     */
-   ranges = (SerializedRanges *) PG_DETOAST_DATUM_PACKED(PG_GETARG_DATUM(0));
+   ranges = (SerializedRanges *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
 
    /* lookup output func for the type */
    getTypeOutputInfo(ranges->typid, &outfunc, &isvarlena);