[jira] [Assigned] (IGNITE-12566) Calcite integration. Expressions evaluation.

["Igor Seliverstov (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-12566?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Igor Seliverstov reassigned IGNITE-12566:
-----------------------------------------

    Assignee: Igor Seliverstov

> Calcite integration. Expressions evaluation.
> --------------------------------------------
>
>                 Key: IGNITE-12566
>                 URL: https://issues.apache.org/jira/browse/IGNITE-12566
>             Project: Ignite
>          Issue Type: Task
>            Reporter: Igor Seliverstov
>            Assignee: Igor Seliverstov
>            Priority: Major
>
> Currently we use a part of Calcite "Bindables" to evaluate expressions at the execution time. Using it we 
>  * lose a control on how expressions are evaluated
>  * cannot implement several important optimizations, like "keepBinary"
>  * can use only Object[] as a row, which causes a lot of array copy operations and unnecessary allocations at the execution time
>  * suffer from delays, which go from expressions compilation process when it's more efficient to start from interpretation and compile an expression on repeatable execution only
> We need to implement expressions interpreter and our own expression compiler taking Ignite specifics in consideration.



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