Reset the binary heap in MergeAppend rescans.

Failing to do so can cause queries to return wrong data, error out or crash.
This requires adding a new binaryheap_reset() method to binaryheap.c,
but that probably should have been there anyway.

Per bug #8410 from Terje Elde. Diagnosis and patch by Andres Freund.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/8e2b71d2d0381f7acc820a2400580a1e3a6add8c

Modified Files
--------------
src/backend/executor/nodeMergeAppend.c | 1 +
src/backend/lib/binaryheap.c | 20 +++++++++++++++++---
src/include/lib/binaryheap.h | 1 +
3 files changed, 19 insertions(+), 3 deletions(-)

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postedAug 30, '13 at 11:16p
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