# An inplace update had been able to abort before sending the inplace # invalidation message to the shared queue. If a heap_update() caller then # retrieved its oldtup from a cache, the heap_update() could revert the # inplace update. setup { CREATE TABLE newly_indexed (c int); } teardown { DROP TABLE newly_indexed; } session s1 step cir1 { BEGIN; CREATE INDEX i1 ON newly_indexed (c); ROLLBACK; } step read1 { SELECT relhasindex FROM pg_class WHERE oid = 'newly_indexed'::regclass; } session s2 step cic2 { CREATE INDEX i2 ON newly_indexed (c); } session s3 step cachefill3 { TABLE newly_indexed; } step ddl3 { ALTER TABLE newly_indexed ADD extra int; } permutation cachefill3 # populates the pg_class row in the catcache cir1 # sets relhasindex=true; rollback discards cache inval cic2 # sees relhasindex=true, skips changing it (so no inval) ddl3 # cached row as the oldtup of an update, losing relhasindex read1 # observe damage # without cachefill3, no bug permutation cir1 cic2 ddl3 read1