Fucun Chu has uploaded this change for review. ( http://gerrit.cloudera.org:8080/17744
Change subject: IMPALA-10835: Extend the DS_HLL_SKETCH function to accept a precision ...................................................................... IMPALA-10835: Extend the DS_HLL_SKETCH function to accept a precision This path addresses the current limitation in DS_HLL_SKETCH function by extending the function to optionally take a secondary argument called precision. DS_HLL_SKETCH(expression [, precision]) The precision value must be between 4 and 21, specified as an integer literal. The default is 12. Here are test results of a typical workload in tpch25.lineitem (#1): +====================================================================+ | Metric | Count Distinct | DS_HLL-12 | DS_HLL-16 | DS_HLL-21 | +--------------------------------------------------------------------+ | Memory(MB) | 725.43 | 124.87 | 123.19 | 121.85 | | Duration(s) | 5.64 | 1.03 | 1.13 | 1.64 | | ErrorRate | 0% | 1.26% | 0.22% | 0.05% | +====================================================================+ Testing: 1. Ran unit tests against table lineitem in TPC-DS in both serial and parallel plan settings; 2. Ran "core" tests. Change-Id: I91a360bb046d4abb101641772b6159308bf6c014 --- M be/src/exprs/aggregate-functions-ir.cc M be/src/exprs/aggregate-functions.h M be/src/exprs/datasketches-common.h M fe/src/main/java/org/apache/impala/analysis/FunctionCallExpr.java M fe/src/main/java/org/apache/impala/catalog/BuiltinsDb.java M testdata/workloads/functional-query/queries/QueryTest/datasketches-hll.test 6 files changed, 155 insertions(+), 3 deletions(-) git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/44/17744/1 -- To view, visit http://gerrit.cloudera.org:8080/17744 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-MessageType: newchange Gerrit-Change-Id: I91a360bb046d4abb101641772b6159308bf6c014 Gerrit-Change-Number: 17744 Gerrit-PatchSet: 1 Gerrit-Owner: Fucun Chu <chufu...@hotmail.com> Gerrit-Reviewer: Csaba Ringhofer <csringho...@cloudera.com> Gerrit-Reviewer: Gabor Kaszab <gaborkas...@cloudera.com>
