E&S CVS Commit: PEAK - Remove duplication by making Projection a kind of Table. Refactor

[pje at eby-sarna.com]

Module Name:	PEAK
Committed By:	pje
Date:		Wed Oct 22 22:41:19 UTC 2003

Modified Files:
	PEAK/src/peak/query: algebra.py interfaces.py
	PEAK/src/peak/query/tests: test_algebra.py

Log Message:
Remove duplication by making Projection a kind of Table.  Refactor
attributes() method of relvars to provide a kjGraph that maps column names
to domain variables (actual columns).  This should let us have comparison
operators act directly on domain variables, and it doesn't matter what the
column name is called.  Also, if column objects know their table aliases,
this should also make it easier to generate SQL from a BasicJoin or Table.


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http://cvs.eby-sarna.com/PEAK/src/peak/query/algebra.py.diff?r1=1.5&r2=1.6
http://cvs.eby-sarna.com/PEAK/src/peak/query/interfaces.py.diff?r1=1.5&r2=1.6
http://cvs.eby-sarna.com/PEAK/src/peak/query/tests/test_algebra.py.diff?r1=1.6&r2=1.7

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cvs rdiff -r1.5 -r1.6 PEAK/src/peak/query/algebra.py \
    PEAK/src/peak/query/interfaces.py
cvs rdiff -r1.6 -r1.7 PEAK/src/peak/query/tests/test_algebra.py

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