Erik Nordström 7b299fa05f Handle empty append plans in ConstraintAwareAppend
Append plans that are empty (no children) are replaced at planning-
time with a Result plan node that returns nothing. Such Result nodes
occur typically when querying outside the time range covered by chunks.
However, the ConstraintAwareAppend plan node did not handle the
case of a Result child node, instead expecting either an Append or
MergeAppend node. This is now fixed so that encountering a Result node
means doing nothing.
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