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Hash join changes for probe side spilling support
The hash join related changes made to support probe side spilling: hash build operator is always waiting for the hash probe to finish no matter there is pending spilled partition to restore or not. The reason is that the hash probe might trigger spilling as well. This requires the change in hash build operator and the corresponding API change in hash join bridge: setHashTable extend hash join bridge to add setSpilledHashTable API which used by hash probe operator to save the spilled table partitions in the hash join bridge. The function also clears the the spilled hash table cached in the build result in hash join bridge to release the held memory resource. extend hash join node reclaimer to reclaim from both build and probe side once. The actual probe side spilling is in followup.
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