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Type:
Improvement
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Status: Closed
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Priority:
Minor
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Resolution: Fixed
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Affects Version/s: 2.9, 2.9.1, 3.0
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Component/s: core/search
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Labels:None
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Lucene Fields:New, Patch Available
The current FilteredTermEnum in NRQ uses setEnum() which itsself calls next(). This may lead to a recursion that can overflow stack, if the index is empty and a large range with low precStep is used. With 64 bit numbers and precStep == 1 there may be 127 recursions, as each sub-range would hit no term on empty index and the setEnum call would then call next() which itsself calls setEnum again. This leads to recursion depth of 256.
Attached is a patch that converts to iterative approach. setEnum is now unused and throws UOE (like endEnum()).