Rajesh Balamohan created HIVE-24075: ---------------------------------------
Summary: Optimise KeyValuesInputMerger Key: HIVE-24075 URL: https://issues.apache.org/jira/browse/HIVE-24075 Project: Hive Issue Type: Improvement Reporter: Rajesh Balamohan Comparisons in KeyValueInputMerger can be reduced. [https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/tez/tools/KeyValuesInputMerger.java#L165|https://github.infra.cloudera.com/CDH/hive/blob/cdpd-master/ql/src/java/org/apache/hadoop/hive/ql/exec/tez/tools/KeyValuesInputMerger.java#L165] [https://github.infra.cloudera.com/CDH/hive/blob/cdpd-master/ql/src/java/org/apache/hadoop/hive/ql/exec/tez/tools/KeyValuesInputMerger.java#L150|https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/tez/tools/KeyValuesInputMerger.java#L150] If the reader comparisons in the queue are same, we could reuse "{{nextKVReaders}}" in next subsequent iteration instead of doing the comparison all over again. [https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/tez/tools/KeyValuesInputMerger.java#L178] -- This message was sent by Atlassian Jira (v8.3.4#803005)