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fix subtle bug in adding to a list we are iterating over

moonshot/custom-path
Nils Dijk 2020-05-07 19:08:47 +02:00
parent 23b11b470b
commit 6b8e0a6105
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GPG Key ID: CA1177EF9434F241
1 changed files with 14 additions and 1 deletions
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15
src/backend/distributed/planner/path_based_planner.c
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@ -383,6 +383,13 @@ PathBasedPlannerJoinHook(PlannerInfo *root,
JoinType jointype,
JoinPathExtraData *extra)
{
/*
* Adding a path to a list includes lappend which might be destructive. Since we are
* looping over the paths we are adding to we should keep a list of new paths to add
* and only add them after we have found all the paths we want to add.
*/
List *newPaths = NIL;
if (jointype == JOIN_INNER)
{
ListCell *pathCell = NULL;
@ -392,10 +399,16 @@ PathBasedPlannerJoinHook(PlannerInfo *root,
Path *optimizedPath = OptimizeJoinPath(originalPath);
if (optimizedPath)
{
add_path(joinrel, optimizedPath);
newPaths = lappend(newPaths, optimizedPath);
}
}
}
Path *path = NULL;
foreach_ptr(path, newPaths)
{
add_path(joinrel, path);
}
}
/*