E&S CVS Commit: PEAK - More refactorings and simplifications:

pje at eby-sarna.com pje at eby-sarna.com
Wed Oct 22 19:41:01 EDT 2003

Module Name:	PEAK
Committed By:	pje
Date:		Wed Oct 22 23:40:15 UTC 2003

Modified Files:
	PEAK/src/peak/query: algebra.py

Log Message:
More refactorings and simplifications:

* Merged Projection into BasicJoin, so a BasicJoin conveniently contains
  everything needed to generate a simple SQL SELECT

* Refactor BasicJoin to be a subclass of Table, removing various methods
  that were duplicated between the two.

* Made & and | of a condition with 'None' into a no-op, thus making it
  possible to have a BasicJoin with a condition of 'None' (e.g. for a
  SELECT with no WHERE clause).

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