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fixed problem with select and renames when using fields

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git-svn-id: http://galileo.dmi.unict.it/svn/relational/trunk@171 014f5005-505e-4b48-8d0a-63407b615a7c
This commit is contained in:
LtWorf 2009-05-13 14:06:42 +00:00
parent 77c6cec3e9
commit 17080aa381
1 changed files with 6 additions and 3 deletions
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9
relational/optimizations.py
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@ -213,7 +213,6 @@ def swap_rename_select(n):
them with ρ j(σ k(R)). Renaming the attributes used in the
selection, so the operation is still valid.'''
#TODO document into the wiki
#FIXME selection of date.day won't work.
changes=0
if n.name=='σ' and n.child.name=='ρ':
@ -229,8 +228,12 @@ def swap_rename_select(n):
#Renaming stuff
for i in range(len(_tokens)):
if _tokens[i] in _vars:
_tokens[i]=_vars[_tokens[i]]
splitted=_tokens[i].split('.',1)
if splitted[0] in _vars:
if len(splitted)==1:
_tokens[i]=_vars[_tokens[i].split('.')[0]]
else:
_tokens[i]=_vars[_tokens[i].split('.')[0]]+'.'+splitted[1]
#Swapping operators
n.name='ρ'