pgsql: Reset the binary heap in MergeAppend rescans.

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(-)

--
Sent via pgsql-committers mailing list (pgsql-committers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-committers