optimize automatonquery
-----------------------
Key: LUCENE-2351
URL: https://issues.apache.org/jira/browse/LUCENE-2351
Project: Lucene - Java
Issue Type: Improvement
Components: Search
Affects Versions: Flex Branch
Reporter: Robert Muir
Priority: Minor
Fix For: Flex Branch
Mike found a few cases in flex where we have some bad behavior with
automatonquery.
The problem is similar to a database query planner, where sometimes simply
doing a full table scan is faster than using an index.
We can optimize automatonquery a little bit, and get better performance for
fuzzy,wildcard,regex queries.
Here is a list of ideas:
* create commonSuffixRef for infinite automata, not just really-bad linear scan
cases
* do a null check rather than populating an empty commonSuffixRef
* localize the 'linear' case to not seek, but instead scan, when ping-ponging
against loops in the state machine
* add a mechanism to enable/disable the terms dict cache, e.g. we can disable
it for infinite cases, and maybe fuzzy N>1 also.
* change the use of BitSet to OpenBitSet or long[] gen for path-tracking
* optimize the backtracking code where it says /* String is good to go as-is
*/, this need not be a full run(), I think...
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