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Namit Jain commented on HIVE-2121: ---------------------------------- A few other comments: The percentage of data read is currently a function of the split size - we should mark the last split specially, and only read the required data at runtime. I mean, if we have only 1 split, and we need to sample 10% of the data, there should be a way to do so. Currently, it seems impossible. > Input Sampling By Splits > ------------------------ > > Key: HIVE-2121 > URL: https://issues.apache.org/jira/browse/HIVE-2121 > Project: Hive > Issue Type: New Feature > Reporter: Siying Dong > Assignee: Siying Dong > Attachments: HIVE-2121.1.patch, HIVE-2121.2.patch, HIVE-2121.3.patch, > HIVE-2121.4.patch > > > We need a better input sampling to serve at least two purposes: > 1. test their queries against a smaller data set > 2. understand more about how the data look like without scanning the whole > table. > A simple function that gives a subset splits will help in those cases. It > doesn't have to be strict sampling. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira