[ https://issues.apache.org/jira/browse/IMPALA-10282?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Fucun Chu resolved IMPALA-10282. -------------------------------- Fix Version/s: Impala 4.0 Resolution: Fixed > Implement ds_cpc_sketch() and ds_cpc_estimate() functions > ---------------------------------------------------------- > > Key: IMPALA-10282 > URL: https://issues.apache.org/jira/browse/IMPALA-10282 > Project: IMPALA > Issue Type: New Feature > Components: Backend, Frontend > Reporter: Fucun Chu > Assignee: Fucun Chu > Priority: Major > Fix For: Impala 4.0 > > > These should be built-in functions that use DataSketches functionality that > was integrated by IMPALA-10279. > ds_cpc_sketch() should receive a primitive expression and return a sketch in > string type (or binary once that work is submitted). > ds_cpc_estimate() should receive a sketch and return an estimate of unique > count from a given CpcSketch. > Usage: > select ds_cpc_estimate(ds_cpc_sketch(col_name)) from table_name; > Hive change that introduced the same: > https://issues.apache.org/jira/browse/HIVE-22940 > Some further examples found here: > [http://datasketches.apache.org/docs/CPC/CpcCppExample.html] > -- 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