[jira] [Updated] (SOLR-12355) HashJoinStream's use of String::hashCode results in non-matching tuples being considered matches

["Dennis Gove (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-12355?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dennis Gove updated SOLR-12355:
-------------------------------
    Attachment: SOLR-12355.patch

> HashJoinStream's use of String::hashCode results in non-matching tuples being considered matches
> ------------------------------------------------------------------------------------------------
>
>                 Key: SOLR-12355
>                 URL: https://issues.apache.org/jira/browse/SOLR-12355
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: SolrJ
>    Affects Versions: 6.0
>            Reporter: Dennis Gove
>            Assignee: Dennis Gove
>            Priority: Major
>         Attachments: SOLR-12355.patch
>
>
> The following strings have been found to have hashCode conflicts and as such can result in HashJoinStream considering two tuples with fields of these values to be considered the same.
> {code:java}
> "MG!!00TNGP::Mtge::".hashCode() == "MG!!00TNH1::Mtge::".hashCode() {code}
> This means these two tuples are the same if we're comparing on field "foo"
> {code:java}
> {
>   "foo":"MG!!00TNGP::Mtge::"
> }
> {
>   "foo":"MG!!00TNH1::Mtge::"
> }
> {code}
> and these two tuples are the same if we're comparing on fields "foo,bar"
> {code:java}
> {
>   "foo":"MG!!00TNGP"
>   "bar":"Mtge"
> }
> {
>   "foo":"MG!!00TNH1"
>   "bar":"Mtge"
> }{code}



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