Ashutosh Chauhan created HIVE-20260: ---------------------------------------
Summary: NDV of a column shouldn't be scaled when row count is changed by filter on another column Key: HIVE-20260 URL: https://issues.apache.org/jira/browse/HIVE-20260 Project: Hive Issue Type: Improvement Components: Statistics Reporter: Ashutosh Chauhan HIVE-17465 introduced progressive scaling of rowcounts in presence of multiple filters. HIVE-19500 improved on that by also scaling col stats (NDV) in such scenario. However, it should pay attention to column used in filter expression and not scale for all filters. eg., consider filter a = 1 and b = 2 ndv of column b should not be scaled down by row count changes caused by a = 1 Other way to say this that ndv of a particular column should be updated at the end of computation of row count for that operator. -- This message was sent by Atlassian JIRA (v7.6.3#76005)