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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_r151013728
--- Diff: phoenix-core/src/it/java/org/apache/phoenix/end2end/CostBasedDecisionIT.java
---
@@ -0,0 +1,50 @@
+package org.apache.phoenix.end2end;
+
+import static org.apache.phoenix.util.TestUtil.TEST_PROPERTIES;
+import static org.junit.Assert.assertTrue;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.util.Properties;
+
+import org.apache.phoenix.util.PropertiesUtil;
+import org.apache.phoenix.util.QueryUtil;
+import org.junit.Test;
+
+public class CostBasedDecisionIT extends ParallelStatsEnabledIT {
--- End diff --
I think we need more tests for this.
> 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
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