[ https://issues.apache.org/jira/browse/IMPALA-7814?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Pooja Nilangekar reassigned IMPALA-7814: ---------------------------------------- Assignee: Pooja Nilangekar > AggregationNode's memory estimate should be based on NDV only for > non-grouping aggs > ------------------------------------------------------------------------------------ > > Key: IMPALA-7814 > URL: https://issues.apache.org/jira/browse/IMPALA-7814 > Project: IMPALA > Issue Type: Sub-task > Reporter: Pooja Nilangekar > Assignee: Pooja Nilangekar > Priority: Major > > Currently, the AggregationNode always computes the NDV to estimate the number > of rows. However, for grouping aggregates, the entire input has to be > consumed before the output can be produced, hence its memory estimate should > not consider the NDV. This is acceptable for non-grouping aggregates because > it only need to store the value expression during the build phase, instead of > the entire tuple. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-all-unsubscr...@impala.apache.org For additional commands, e-mail: issues-all-h...@impala.apache.org