Transaction safe Truncate

Didn't move anything anywhere.  Simply split cluster_rel into two parts.
rebuild_rel() does the rebuilding steps.  Truncate uses this skipping
the datacopy stage by calling with dataCopy = false.


If wanted (separate patch), the below could (should?) probably move to
heap.c:
rebuild_rel
make_new_heap
copy_heap_data
swap_relfilenodes

The below could (should?) move to index.c:
get_indexattr_list
recreate_indexattr

That leaves the below in cluster.c:
cluster_rel
cluster
check_cluster_ownership
get_table_to_cluster



-- 
Rod Taylor <rbt@xxxxxx>

transactionsafe_truncate.patch
Description: Text document

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