On Mon, Apr 15, 2019 at 10:46:56PM -0400, Tom Lane wrote: > create table t1 as select generate_series(1,40000000) id; > vacuum analyze t1; > explain select * from t1, t1 t1b where t1.id = t1b.id; > -- should indicate a hash join > explain analyze select * from t1, t1 t1b where t1.id = t1b.id; > > ... watch the process's memory consumption bloat. (It runs for > awhile before that starts to happen, but eventually it goes to > a couple of GB.) > > It looks to me like the problem is that ExecHashJoinGetSavedTuple > calls ExecForceStoreMinimalTuple with shouldFree = true, and > ExecForceStoreMinimalTuple's second code branch simply ignores > the requirement to free the supplied tuple.
Open item added, as the root comes from 4da597ed. -- Michael
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