Rethink original decision to use AND/OR Expr nodes to represent bitmap

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 14c7fba3f7d0769d8a063dea2854693f35535f6a
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2005-04-21T19:18:13Z
Releases: 8.1.0
Rethink original decision to use AND/OR Expr nodes to represent bitmap
logic operations during planning.  Seems cleaner to create two new Path
node types, instead --- this avoids duplication of cost-estimation code.
Also, create an enable_bitmapscan GUC parameter to control use of bitmap
plans.

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