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https://issues.apache.org/jira/browse/HIVE-23030?focusedWorklogId=409263&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-409263
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ASF GitHub Bot logged work on HIVE-23030:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 25/Mar/20 01:13
Start Date: 25/Mar/20 01:13
Worklog Time Spent: 10m
Work Description: jcamachor commented on pull request #960: HIVE-23030 ds
rollup union
URL: https://github.com/apache/hive/pull/960#discussion_r397521965
##########
File path: ql/src/test/queries/clientpositive/sketches_rollup.q
##########
@@ -0,0 +1,40 @@
+
+set hive.support.concurrency=true;
+set hive.txn.manager=org.apache.hadoop.hive.ql.lockmgr.DbTxnManager;
+set hive.strict.checks.cartesian.product=false;
+set hive.stats.fetch.column.stats=true;
+set hive.materializedview.rewriting=true;
+set hive.fetch.task.conversion=none;
+
+create table sketch_input (id int, category char(1))
+STORED AS ORC
+TBLPROPERTIES ('transactional'='true');
+
+insert into table sketch_input values
+ (1,'a'),(1, 'a'), (2, 'a'), (3, 'a'), (4, 'a'), (5, 'a'), (6, 'a'), (7,
'a'), (8, 'a'), (9, 'a'), (10, 'a'),
+ (6,'b'),(6, 'b'), (7, 'b'), (8, 'b'), (9, 'b'), (10, 'b'), (11, 'b'), (12,
'b'), (13, 'b'), (14, 'b'), (15, 'b')
+;
+
+-- create an mv for the intermediate results
+create materialized view mv_1 as
+ select category, ds_hll_sketch(id),count(id) from sketch_input group by
category;
+
+-- see if we use the mv
+explain
+select category, ds_hll_estimate(ds_hll_sketch(id)) from sketch_input group by
category;
+
+select category, ds_hll_estimate(ds_hll_sketch(id)) from sketch_input group by
category;
Review comment:
Checking the results below, it seems we will need to add a cast or round
when we do the automatic mapping of count distinct to hll. Can we add any of
these functions to make sure it is working as expected, i.e., rewriting still
being triggered?
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Issue Time Tracking
-------------------
Worklog Id: (was: 409263)
Time Spent: 40m (was: 0.5h)
> Enable sketch union-s to be rolled up
> -------------------------------------
>
> Key: HIVE-23030
> URL: https://issues.apache.org/jira/browse/HIVE-23030
> Project: Hive
> Issue Type: Sub-task
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-23030.01.patch, HIVE-23030.02.patch
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> Enabling rolling up sketch aggregates could enable the matching of
> materialized views created for higher dimensions to be applied for lower
> dimension cases.
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