HAWQ Python library missing import (DatabaseError).
This closes PR.
@@ -22,6 +22,7 @@ import threading
import Queue
from xml.dom import minidom
from xml.etree.ElementTree import ElementTree
+from pygresql.pg import DatabaseError
import shutil
from gppylib.db import dbconn
from gppylib.commands.base import WorkerPool, REMOTE
