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Avoid core dump in _outPathInfo() for Path without a parent RelOptInfo.

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Nearly all Paths have parents, but a ResultPath representing an empty FROM
clause does not.  Avoid a core dump in such cases.  I believe this is only
a hazard for debugging usage, not for production, else we'd have heard
about it before.  Nonetheless, back-patch to 9.1 where the troublesome code
was introduced.  Noted while poking at bug #11703.
This commit is contained in:
Tom Lane
2014-10-17 22:33:14 -04:00
parent 0c9391e529
commit 96139cfbbc
1 changed files with 4 additions and 1 deletions
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5
src/backend/nodes/outfuncs.c
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@ -1466,7 +1466,10 @@ _outPathInfo(StringInfo str, Path *node)
{
WRITE_ENUM_FIELD(pathtype, NodeTag);
appendStringInfo(str, " :parent_relids ");
_outBitmapset(str, node->parent->relids);
if (node->parent)
_outBitmapset(str, node->parent->relids);
else
_outBitmapset(str, NULL);
WRITE_FLOAT_FIELD(startup_cost, "%.2f");
WRITE_FLOAT_FIELD(total_cost, "%.2f");
WRITE_NODE_FIELD(pathkeys);