optimization: when sorting by field, if index has one segment and field values
are not needed, do not load String[] into field cache
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Key: LUCENE-2335
URL: https://issues.apache.org/jira/browse/LUCENE-2335
Project: Lucene - Java
Issue Type: Improvement
Components: Search
Reporter: Michael McCandless
Priority: Minor
Fix For: 3.1
Spinoff from java-dev thread "Sorting with little memory: A suggestion",
started by Toke Eskildsen.
When sorting by SortField.STRING we currently ask FieldCache for a StringIndex
on that field.
This can consumes tons of RAM, when the values are mostly unique (eg a title
field), as it populates both int[] ords as well as String[] values.
But, if the index is only one segment, and the search sets fillFields=false, we
don't need the String[] values, just the int[] ords. If the app needs to show
the fields it can pull them (for the 1 page) from stored fields.
This can be a potent optimization -- alot of RAM saved -- for optimized indexes.
When fixing this we must take care to share the int[] ords if some queries do
fillFields=true and some =false... ie, FieldCache will be called twice and it
should share the int[] ords across those invocations.
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