mahesh kumar behera created HIVE-25142:
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Summary: Rehashing in map join fast hash table causing corruption
for large keys
Key: HIVE-25142
URL: https://issues.apache.org/jira/browse/HIVE-25142
Project: Hive
Issue Type: Bug
Components: Hive
Reporter: mahesh kumar behera
Assignee: mahesh kumar behera
In map join the hash table is created using the keys. To support rehashing, the
keys are stored in write buffer. The hash table contains the offset of the keys
along with the hash code. When rehashing is done, the offset is extracted from
the hash table and then hash code is generated again. For large keys of size
greater than 255, the key length is also stored along with the key. In case ofÂ
fast hash table implementation the way key is extracted is not proper. There is
a code bug and thats causing the wrong key to be extracted and causing wrong
hash code generation. This is causing the corruption in the hash table.
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