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optimizes over and over until the tree is stabilized

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git-svn-id: http://galileo.dmi.unict.it/svn/relational/trunk@144 014f5005-505e-4b48-8d0a-63407b615a7c
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LtWorf 2009-04-30 18:21:50 +00:00
parent 88efcf0b78
commit 444d3f9987
1 changed files with 5 additions and 2 deletions
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relational/optimizer.py
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@ -166,8 +166,11 @@ def general_optimize(expression):
'''This function performs general optimizations. Means that it will not need to
know the fields used by the relations'''
n=tree(expression) #Gets the tree
total=1
while total!=0:
total=0
for i in optimizations.general_optimizations:
print "Changes done: ", i(n) #Performs the optimization
total+=i(n) #Performs the optimization
return n.__str__()
if __name__=="__main__":