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how to do 3rd party optimizations

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git-svn-id: http://galileo.dmi.unict.it/svn/relational/trunk@159 014f5005-505e-4b48-8d0a-63407b615a7c
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LtWorf 2009-05-11 16:57:23 +00:00
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relational/optimizations.py
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@ -19,7 +19,16 @@
'''This module contains functions to perform various optimizations on the expression trees. '''This module contains functions to perform various optimizations on the expression trees.
The list general_optimizations contains pointers to general functions, so they can be called The list general_optimizations contains pointers to general functions, so they can be called
within a cycle.''' within a cycle.
It is possible to add new general optimizations by adding the function in the list
general_optimizations present in this module. And the optimization will be executed with the
other ones when optimizing.
A function will have one parameter, which is the root node of the tree describing the expression.
The class used is defined in optimizer module.
A function will have to return the number of changes performed on the tree.
'''
import optimizer import optimizer