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ASF GitHub Bot commented on PHOENIX-4288: ----------------------------------------- Github user JamesRTaylor commented on a diff in the pull request: https://github.com/apache/phoenix/pull/281#discussion_r151016226 --- Diff: phoenix-core/src/main/java/org/apache/phoenix/execute/AggregatePlan.java --- @@ -112,7 +114,26 @@ private AggregatePlan(StatementContext context, FilterableStatement statement, T public Expression getHaving() { return having; } - + + @Override + public Cost getCost() throws SQLException { + Long byteCount = getEstimatedBytesToScan(); + if (byteCount == null) { + return Cost.ZERO; + } + + int parallelLevel = 10; --- End diff -- How about passing in groupBy instead of just groupBy.isUngroupedAggregate() as I think we'd want to get more info eventually out of the groupBy (for example, if it's ordered or unordered which impacts memory usage substantially)? This might help keep the interfaces a little more stable. > Indexes not used when ordering by primary key > --------------------------------------------- > > Key: PHOENIX-4288 > URL: https://issues.apache.org/jira/browse/PHOENIX-4288 > Project: Phoenix > Issue Type: Sub-task > Reporter: Marcin Januszkiewicz > Assignee: Maryann Xue > Labels: CostBasedOptimization > > We have a table > CREATE TABLE t ( > rowkey VARCHAR PRIMARY KEY, > c1 VARCHAR, > c2 VARCHAR > ) > which we want to query by doing partial matches on c1, and keep the ordering > of the source table: > SELECT rowkey, c1, c2 FROM t where c1 LIKE 'X0%' ORDER BY rowkey; > We expect most queries to select a small subset of the table, so we create an > index to speed up searches: > CREATE LOCAL INDEX t_c1_ix ON t (c1); > However, this index will not be used since Phoenix will always choose not to > resort the data. > In our actual use case, adding index hints is not a practical solution. > See also discussion at: > https://lists.apache.org/thread.html/26ab58288eb811d2f074c3f89067163d341e5531fb581f3b2486cf43@%3Cuser.phoenix.apache.org%3E -- This message was sent by Atlassian JIRA (v6.4.14#64029)