Fucun Chu created IMPALA-10718: ---------------------------------- Summary: Implement ds_tuple_arrayofdouble_sketch() and ds_tuple_arrayofdouble_estimate() functions Key: IMPALA-10718 URL: https://issues.apache.org/jira/browse/IMPALA-10718 Project: IMPALA Issue Type: New Feature Components: Backend, Frontend Reporter: Fucun Chu Assignee: Fucun Chu
These should be built-in functions that use DataSketches functionality that was integrated by [IMPALA-10717|https://issues.apache.org/jira/browse/IMPALA-10717]. ds_tuple_arrayofdouble_sketch() should receive a primitive expression, parameter and return a sketch. ds_tuple_arrayofdouble_estimate() should receive a sketch and return a primitive that is the cardinality estimate for that set of data provided to the sketch. Usage: {code:java} select ds_tuple_arrayofdouble_estimate(ds_tuple_arrayofdouble_sketch(col_name, parameter)) from table_name; {code} Returns a cardinality estimate for that particular column. Hive change that introduced the same: https://issues.apache.org/jira/browse/HIVE-22940 https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/DataSketchesFunctions.java -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-all-unsubscr...@impala.apache.org For additional commands, e-mail: issues-all-h...@impala.apache.org