[jira] [Resolved] (KYLIN-2620) Check for "ORDER BY LIMIT" clause when rewrite SUM query as TOPN
[ https://issues.apache.org/jira/browse/KYLIN-2620?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] nichunen resolved KYLIN-2620. - Resolution: Fixed > Check for "ORDER BY LIMIT" clause when rewrite SUM query as TOPN > > > Key: KYLIN-2620 > URL: https://issues.apache.org/jira/browse/KYLIN-2620 > Project: Kylin > Issue Type: Bug > Components: Measure - TopN >Reporter: Lin Tingmao >Assignee: Chao Long >Priority: Major > Fix For: v3.0.0, v2.6.3 > > Attachments: cube_desc.png, sql.png > > > When running the following query > select sum(measure) from table group by col_id > if there exists TOPN(measure, group by col_id) measure, > TopNMeasureType.isTopNCompatibleSum()will pass, so the SUM is rewritten > to TOPN. This confuses the user since they may expect a accurate result for > every distinct value of group by column(s). > Kylin should check if "ORDER BY col_id LIMIT topncapacity" is present in the > query to determine whether to rewrite. -- This message was sent by Atlassian JIRA (v7.6.3#76005)
[jira] [Resolved] (KYLIN-2620) Check for "ORDER BY LIMIT" clause when rewrite SUM query as TOPN
[ https://issues.apache.org/jira/browse/KYLIN-2620?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] nichunen resolved KYLIN-2620. - Resolution: Fixed Committed to 2.6.x branch > Check for "ORDER BY LIMIT" clause when rewrite SUM query as TOPN > > > Key: KYLIN-2620 > URL: https://issues.apache.org/jira/browse/KYLIN-2620 > Project: Kylin > Issue Type: Bug > Components: Measure - TopN >Reporter: Lin Tingmao >Assignee: Chao Long >Priority: Major > Fix For: v2.6.2 > > > When running the following query > select sum(measure) from table group by col_id > if there exists TOPN(measure, group by col_id) measure, > TopNMeasureType.isTopNCompatibleSum()will pass, so the SUM is rewritten > to TOPN. This confuses the user since they may expect a accurate result for > every distinct value of group by column(s). > Kylin should check if "ORDER BY col_id LIMIT topncapacity" is present in the > query to determine whether to rewrite. -- This message was sent by Atlassian JIRA (v7.6.3#76005)
