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

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

Dennis Gove created SOLR-12355:
----------------------------------

             Summary: 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


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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