Tom Lane a536ed53bc Make use of statistics on index expressions. There are still some
corner cases that could stand improvement, but it does all the basic
stuff.  A byproduct is that the selectivity routines are no longer
constrained to working on simple Vars; we might in future be able to
improve the behavior for subexpressions that don't match indexes.
2004-02-17 00:52:53 +00:00
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