Hi,
In create_unique_path() there's comment /* * We must ensure path struct and subsidiary data are allocated in main
* planning context; otherwise GEQO memory management causes trouble. */ oldcontext =
MemoryContextSwitchTo(root->planner_cxt);
pathnode = makeNode(UniquePath);
This means that when GEQO resets the memory context, the RelOptInfo
for which this path is created and may be set to cheapest_unique_path
goes away, the unique path lingers on in the planner context.
Shouldn't we instead allocate the path in the same context as the
RelOptInfo similar to mark_dummy_rel()?
--
Best Wishes,
Ashutosh Bapat
EnterpriseDB Corporation
The Postgres Database Company
