Jungtaek Lim created SPARK-30075:
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Summary: ArrayIndexType doesn't implement hashCode correctly
Key: SPARK-30075
URL: https://issues.apache.org/jira/browse/SPARK-30075
Project: Spark
Issue Type: Bug
Components: Spark Core
Affects Versions: 2.4.4, 3.0.0
Reporter: Jungtaek Lim
[https://github.com/apache/spark/blob/master/common/kvstore/src/test/java/org/apache/spark/util/kvstore/ArrayKeyIndexType.java]
{code:java}
public class ArrayKeyIndexType {
@KVIndex
public int[] key;
@KVIndex("id")
public String[] id;
@Override
public boolean equals(Object o) {
if (o instanceof ArrayKeyIndexType) {
ArrayKeyIndexType other = (ArrayKeyIndexType) o;
return Arrays.equals(key, other.key) && Arrays.equals(id, other.id);
}
return false;
}
@Override
public int hashCode() {
return key.hashCode();
}
} {code}
Here hashCode() simply calls key.hashCode() which won't work as our intention -
as the implementation would be Object.hashCode(). We need to call
Array.hashCode(key) instead.
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