[teiid-issues] [JBoss JIRA] (TEIID-2732) Improve repeated string serialization performance

[Steven Hawkins (JIRA)]

     [ https://issues.jboss.org/browse/TEIID-2732?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins resolved TEIID-2732.
-----------------------------------

    Resolution: Done


As far as I can tell the overhead of maintaining a map of string values is sufficiently low compared to the time/space savings.  Using our own map also results in better performance than object serialization and allows us to combine values based upon equality, not just object identity.
                
> Improve repeated string serialization performance
> -------------------------------------------------
>
>                 Key: TEIID-2732
>                 URL: https://issues.jboss.org/browse/TEIID-2732
>             Project: Teiid
>          Issue Type: Quality Risk
>          Components: Query Engine
>    Affects Versions: 7.7
>            Reporter: Steven Hawkins
>            Assignee: Steven Hawkins
>             Fix For: 8.6
>
>
> In Teiid 7.5 we switched away from object serialization to writing every value to the serialization stream.  This provides better performance for distinct/small values, but adds a significant amount of overhead compared to just object serialization for large and repeated values.

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