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https://issues.apache.org/jira/browse/CALCITE-4269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17201167#comment-17201167
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Rui Wang commented on CALCITE-4269:
-----------------------------------

Fixed in 
https://github.com/apache/calcite/commit/1b430915730b66f26a00205ab93cd3c68d16ef90

> Improvement on enumerable implementation for HOP and SESSION
> ------------------------------------------------------------
>
>                 Key: CALCITE-4269
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4269
>             Project: Calcite
>          Issue Type: Sub-task
>            Reporter: Rui Wang
>            Assignee: Rui Wang
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.26.0
>
>          Time Spent: 1h 20m
>  Remaining Estimate: 0h
>
> 1. Should replace LinkedList with ArrayDeque because ArrayDeque should be 
> more efficient in most cases.
> 2. list member variable should be final



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