Speed up query "select xx,xx from xxx LIMIT xxx" if no filtering or aggregation
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Key: HIVE-2068
URL: https://issues.apache.org/jira/browse/HIVE-2068
Project: Hive
Issue Type: Improvement
Reporter: Siying Dong
Assignee: Siying Dong
Currently, "select xx,xx from xxx where ...(only partition conditions) LIMIT
xxx" will start a MapReduce job with input to be the whole table or partition.
The latency can be huge if the table or partition is big. We could reduce
number of input files to speed up the queries.
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