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Add SysCacheGetAttrNotNull for guaranteed not-null attrs

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When extracting an attr from a cached tuple in the syscache with
SysCacheGetAttr the isnull parameter must be checked in case the
attr cannot be NULL.  For cases when this is known beforehand, a
wrapper is introduced which perform the errorhandling internally
on behalf of the caller, invoking an elog in case of a NULL attr.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Peter Eisentraut <peter.eisentraut@enterprisedb.com>
Reviewed-by: David Rowley <dgrowleyml@gmail.com>
Discussion: https://postgr.es/m/AD76405E-DB45-46B6-941F-17B1EB3A9076@yesql.se
This commit is contained in:
Daniel Gustafsson
2023-03-25 22:49:33 +01:00
parent e33967b13b
commit d435f15fff
38 changed files with 232 additions and 452 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
src/backend/utils/adt/pg_locale.c
View File

@ -1285,15 +1285,12 @@ lookup_collation_cache(Oid collation, bool set_flags)
if (collform->collprovider == COLLPROVIDER_LIBC)
{
Datum datum;
bool isnull;
const char *collcollate;
const char *collctype;
datum = SysCacheGetAttr(COLLOID, tp, Anum_pg_collation_collcollate, &isnull);
Assert(!isnull);
datum = SysCacheGetAttrNotNull(COLLOID, tp, Anum_pg_collation_collcollate);
collcollate = TextDatumGetCString(datum);
datum = SysCacheGetAttr(COLLOID, tp, Anum_pg_collation_collctype, &isnull);
Assert(!isnull);
datum = SysCacheGetAttrNotNull(COLLOID, tp, Anum_pg_collation_collctype);
collctype = TextDatumGetCString(datum);
cache_entry->collate_is_c = ((strcmp(collcollate, "C") == 0) ||
@ -1577,11 +1574,9 @@ pg_newlocale_from_collation(Oid collid)
const char *collctype pg_attribute_unused();
locale_t loc;
datum = SysCacheGetAttr(COLLOID, tp, Anum_pg_collation_collcollate, &isnull);
Assert(!isnull);
datum = SysCacheGetAttrNotNull(COLLOID, tp, Anum_pg_collation_collcollate);
collcollate = TextDatumGetCString(datum);
datum = SysCacheGetAttr(COLLOID, tp, Anum_pg_collation_collctype, &isnull);
Assert(!isnull);
datum = SysCacheGetAttrNotNull(COLLOID, tp, Anum_pg_collation_collctype);
collctype = TextDatumGetCString(datum);
if (strcmp(collcollate, collctype) == 0)
@ -1637,8 +1632,7 @@ pg_newlocale_from_collation(Oid collid)
const char *iculocstr;
const char *icurules;
datum = SysCacheGetAttr(COLLOID, tp, Anum_pg_collation_colliculocale, &isnull);
Assert(!isnull);
datum = SysCacheGetAttrNotNull(COLLOID, tp, Anum_pg_collation_colliculocale);
iculocstr = TextDatumGetCString(datum);
datum = SysCacheGetAttr(COLLOID, tp, Anum_pg_collation_collicurules, &isnull);
@ -1659,8 +1653,7 @@ pg_newlocale_from_collation(Oid collid)
collversionstr = TextDatumGetCString(datum);
datum = SysCacheGetAttr(COLLOID, tp, collform->collprovider == COLLPROVIDER_ICU ? Anum_pg_collation_colliculocale : Anum_pg_collation_collcollate, &isnull);
Assert(!isnull);
datum = SysCacheGetAttrNotNull(COLLOID, tp, collform->collprovider == COLLPROVIDER_ICU ? Anum_pg_collation_colliculocale : Anum_pg_collation_collcollate);
actual_versionstr = get_collation_actual_version(collform->collprovider,
TextDatumGetCString(datum));