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From "Vladimir Ozerov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (IGNITE-4085) c
Date Fri, 14 Oct 2016 13:32:20 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-4085?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vladimir Ozerov updated IGNITE-4085:
------------------------------------
    Summary: c  (was: Binary objets: Compare fields of well-known types without deserialization.)

> c
> -
>
>                 Key: IGNITE-4085
>                 URL: https://issues.apache.org/jira/browse/IGNITE-4085
>             Project: Ignite
>          Issue Type: Task
>          Components: binary
>    Affects Versions: 1.7
>            Reporter: Vladimir Ozerov
>              Labels: performance
>             Fix For: 1.8
>
>
> It is not efficient to use {{BinaryField.value}} directly when comparing binary objects
because it leads to "materialization" of the field. 
> Instead, when well-known type is met, we should simply find field start in both objects
and perform usual byte-by-byte comparison.
> E.g., for string it will be:
> 1) Find position
> 2) Compare lengths (readInt)
> 3) Compare contents byte-by-byte.
> The same goes for other types:
> 1) Primitive arrays
> 2) UUID
> 3) Data/TimeStamp.
> Please ensure that byte-by-byte comparison is performed efficiently, e.g. that we compare
bigger chunks (e.g. 8 bytes at once).



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