[jira] [Assigned] (CALCITE-3021) ArrayEqualityComparer should use Arrays#deepEquals/deepHashCode instead of Arrays#equals/hashCode

["Ruben Quesada Lopez (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-3021?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ruben Quesada Lopez reassigned CALCITE-3021:
--------------------------------------------

    Assignee: Ruben Quesada Lopez

> ArrayEqualityComparer should use Arrays#deepEquals/deepHashCode instead of Arrays#equals/hashCode
> -------------------------------------------------------------------------------------------------
>
>                 Key: CALCITE-3021
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3021
>             Project: Calcite
>          Issue Type: Bug
>    Affects Versions: 1.19.0
>            Reporter: Ruben Quesada Lopez
>            Assignee: Ruben Quesada Lopez
>            Priority: Minor
>             Fix For: 1.20.0
>
>
> Currently, ArrayEqualityComparer (which is used as comparer for JavaRowFormat.ARRAY) performs the array comparison based on Arrays#equals and Arrays#hashCode:
> {code:java}
>   private static class ArrayEqualityComparer implements EqualityComparer<Object[]> {
>     public boolean equal(Object[] v1, Object[] v2) {
>       return Arrays.equals(v1, v2);
>     }
>     public int hashCode(Object[] t) {
>       return Arrays.hashCode(t);
>     }
>   }
> {code}
> This will lead to incorrect comparisons in case of multidimensional arrays. To fix the issue, Arrays#deepEquals / Arrays#deepHashCode should be used:
> {code:java}
>   private static class ArrayEqualityComparer implements EqualityComparer<Object[]> {
>     public boolean equal(Object[] v1, Object[] v2) {
>       return Arrays.deepEquals(v1, v2);
>     }
>     public int hashCode(Object[] t) {
>       return Arrays.deepHashCode(t);
>     }
>   }
> {code}



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