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Tom Lane b5febc1d12 Fix IOS planning when only some index columns can return an attribute. ... Since 9.5, it's possible that some but not all columns of an index support returning the indexed value for index-only scans. If the same indexed column appears in index columns that behave both ways, check_index_only() supposed that it'd be OK to do an index-only scan testing that column; but that fails if we have to recheck the indexed condition on one of the columns that doesn't support this. In principle we could make this work by remapping the recheck expressions to pull the value from a column that does support returning the indexed value. But such cases are so weird and rare that, at least for now, it doesn't seem worth the trouble. Instead, just teach check_index_only that a value is returnable only if all the index columns containing it are returnable, rather than any of them. Per report from David Pereiro Lagares. Back-patch to 9.5 where the possibility of this situation appeared. Kyotaro Horiguchi Discussion: https://postgr.es/m/1516210494.1798.16.camel@nlpgo.com		8 years ago
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bit.out	Add index-only scan support to btree_gist.	11 years ago
bytea.out	Add index-only scan support to btree_gist.	11 years ago
cash.out	Add index-only scan support to btree_gist.	11 years ago
char.out	Add index-only scan support to btree_gist.	11 years ago
char_1.out	Add index-only scan support to btree_gist.	11 years ago
cidr.out	…
date.out	Add index-only scan support to btree_gist.	11 years ago
enum.out	Add btree_gist support for enum types.	9 years ago
float4.out	Be more careful about printing constants in ruleutils.c.	11 years ago
float8.out	Be more careful about printing constants in ruleutils.c.	11 years ago
inet.out	Fix IOS planning when only some index columns can return an attribute.	8 years ago
init.out	Test all contrib-created operator classes with amvalidate.	9 years ago
int2.out	Be more careful about printing constants in ruleutils.c.	11 years ago
int4.out	Add index-only scan support to btree_gist.	11 years ago
int8.out	Be more careful about printing constants in ruleutils.c.	11 years ago
interval.out	Properly initialize SortSupport for ORDER BY rechecks in nodeIndexscan.c.	9 years ago
macaddr.out	Add index-only scan support to btree_gist.	11 years ago
macaddr8.out	Add support for EUI-64 MAC addresses as macaddr8	9 years ago
not_equal.out	Ensure plan stability in contrib/btree_gist regression test.	9 years ago
numeric.out	Be more careful about printing constants in ruleutils.c.	11 years ago
oid.out	…
text.out	Add index-only scan support to btree_gist.	11 years ago
text_1.out	Add index-only scan support to btree_gist.	11 years ago
time.out	Add index-only scan support to btree_gist.	11 years ago
timestamp.out	Add index-only scan support to btree_gist.	11 years ago
timestamptz.out	Add index-only scan support to btree_gist.	11 years ago
timetz.out	…
uuid.out	Add uuid to the set of types supported by contrib/btree_gist.	9 years ago
varbit.out	Add index-only scan support to btree_gist.	11 years ago
varchar.out	…
varchar_1.out	…