Robert Muir commented on LUCENE-7966:

yes we have to proceed with caution. the problem is the stringhelper change 
impacts all term dictionaries. but it was broken what they were doing before :)

it is made difficult by some term dictionaries, such as the docvalues ones, 
which do not kick in unless there are many terms, so testing there is light. We 
should really review all uses first.

maybe the change is ok for 7.x too, maybe not. we can decide, but we should 
first get it in safely for master.


> build mr-jar and use some java 9 methods if available
> -----------------------------------------------------
>                 Key: LUCENE-7966
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7966
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/other, general/build
>            Reporter: Robert Muir
>            Assignee: Uwe Schindler
>            Priority: Major
>              Labels: Java9
>         Attachments: LUCENE-7966-v2.patch, LUCENE-7966.patch, 
> LUCENE-7966.patch, LUCENE-7966.patch, LUCENE-7966.patch, LUCENE-7966.patch
> See background: http://openjdk.java.net/jeps/238
> It would be nice to use some of the newer array methods and range checking 
> methods in java 9 for example, without waiting for lucene 10 or something. If 
> we build an MR-jar, we can start migrating our code to use java 9 methods 
> right now, it will use optimized methods from java 9 when thats available, 
> otherwise fall back to java 8 code.  
> This patch adds:
> {code}
> Objects.checkIndex(int,int)
> Objects.checkFromToIndex(int,int,int)
> Objects.checkFromIndexSize(int,int,int)
> Arrays.mismatch(byte[],int,int,byte[],int,int)
> Arrays.compareUnsigned(byte[],int,int,byte[],int,int)
> Arrays.equal(byte[],int,int,byte[],int,int)
> // did not add char/int/long/short/etc but of course its possible if needed
> {code}
> It sets these up in {{org.apache.lucene.future}} as 1-1 mappings to java 
> methods. This way, we can simply directly replace call sites with java 9 
> methods when java 9 is a minimum. Simple 1-1 mappings mean also that we only 
> have to worry about testing that our java 8 fallback methods work.
> I found that many of the current byte array methods today are willy-nilly and 
> very lenient for example, passing invalid offsets at times and relying on 
> compare methods not throwing exceptions, etc. I fixed all the instances in 
> core/codecs but have not looked at the problems with AnalyzingSuggester. Also 
> SimpleText still uses a silly method in ArrayUtil in similar crazy way, have 
> not removed that one yet.

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