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authorArseny Kapoulkine <arseny.kapoulkine@gmail.com>2014-10-27 18:50:09 -0700
committerArseny Kapoulkine <arseny.kapoulkine@gmail.com>2014-10-27 18:50:09 -0700
commitc64d4820b142e6df93ccf612d0e4717159a36591 (patch)
tree67b41215c627fa43283fb1b9a3e14e1bd66fa946 /docs/manual.html
parentdbfe85a717b7ac8b9bd30eb51796811c0c651da9 (diff)
XPath: Optimize [position()=expr] and [last()]
To get more benefits from constant predicate/filter optimization we rewrite [position()=expr] predicates into [expr] for numeric expressions. Right now the rewrite is only for entire expressions - it may be beneficial to split complex expressions like [position()=constant and expr] into [constant][expr] but that is more complicated. last() does not depend on the node set contents so is "constant" as far as our optimization is concerned so we can evaluate it once.
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