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Posted to issues@drill.apache.org by "Vitalii Diravka (JIRA)" <ji...@apache.org> on 2018/01/04 16:28:03 UTC
[jira] [Created] (DRILL-6070) Hash join with empty tables should
not do casting of data types to INT
Vitalii Diravka created DRILL-6070:
--------------------------------------
Summary: Hash join with empty tables should not do casting of data types to INT<OPTIONAL>
Key: DRILL-6070
URL: https://issues.apache.org/jira/browse/DRILL-6070
Project: Apache Drill
Issue Type: Bug
Reporter: Vitalii Diravka
Fix For: Future
LeftJoin query by leveraging HashJoin operator leads to error, but by using MergeJoin works fine.
{code}
0: jdbc:drill:zk=local> alter session set `planner.enable_hashjoin` = true;
+-------+-----------------------------------+
| ok | summary |
+-------+-----------------------------------+
| true | planner.enable_hashjoin updated. |
+-------+-----------------------------------+
1 row selected (0.078 seconds)
0: jdbc:drill:zk=local> alter session set `planner.enable_mergejoin` = false;
+-------+------------------------------------+
| ok | summary |
+-------+------------------------------------+
| true | planner.enable_mergejoin updated. |
+-------+------------------------------------+
1 row selected (0.079 seconds)
0: jdbc:drill:zk=local> select t1.a1, t1.b1, t2.a2, t2.b2 from dfs.`/home/vitalii/IdeaProjects/drill-fork/exec/java-exec/target/test-classes/jsoninput/nullable1.json` t1 left join dfs.`/home/vitalii/IdeaProjects/drill-fork/exec/java-exec/src/test/resources/project/pushdown/empty0.json` t2 on t1.b1 = t2.b2;
Error: SYSTEM ERROR: DrillRuntimeException: Join only supports implicit casts between 1. Numeric data
2. Varchar, Varbinary data 3. Date, Timestamp data Left type: VARCHAR, Right type: INT. Add explicit casts to avoid this error
Fragment 0:0
[Error Id: 2cfc662f-48c2-4e62-a2ea-5a0f33d64c9b on vitalii-pc:31010] (state=,code=0)
{code}
{code}
00-00 Screen : rowType = RecordType(ANY a1, ANY b1, ANY a2, ANY b2): rowcount = 1.0, cumulative cost = {2.1 rows, 20.1 cpu, 0.0 io, 0.0 network, 17.6 memory}, id = 930
00-01 Project(a1=[$0], b1=[$1], a2=[$2], b2=[$3]) : rowType = RecordType(ANY a1, ANY b1, ANY a2, ANY b2): rowcount = 1.0, cumulative cost = {2.0 rows, 20.0 cpu, 0.0 io, 0.0 network, 17.6 memory}, id = 929
00-02 Project(a1=[$1], b1=[$0], a2=[$3], b2=[$2]) : rowType = RecordType(ANY a1, ANY b1, ANY a2, ANY b2): rowcount = 1.0, cumulative cost = {2.0 rows, 20.0 cpu, 0.0 io, 0.0 network, 17.6 memory}, id = 928
00-03 HashJoin(condition=[=($0, $2)], joinType=[left]) : rowType = RecordType(ANY b1, ANY a1, ANY b2, ANY a2): rowcount = 1.0, cumulative cost = {2.0 rows, 20.0 cpu, 0.0 io, 0.0 network, 17.6 memory}, id = 927
00-05 Scan(groupscan=[EasyGroupScan [selectionRoot=file:/home/vitalii/IdeaProjects/drill-fork/exec/java-exec/target/test-classes/jsoninput/nullable1.json, numFiles=1, columns=[`b1`, `a1`], files=[file:/home/vitalii/IdeaProjects/drill-fork/exec/java-exec/target/test-classes/jsoninput/nullable1.json]]]) : rowType = RecordType(ANY b1, ANY a1): rowcount = 1.0, cumulative cost = {0.0 rows, 0.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 925
00-04 Scan(groupscan=[EasyGroupScan [selectionRoot=file:/home/vitalii/IdeaProjects/drill-fork/exec/java-exec/src/test/resources/project/pushdown/empty0.json, numFiles=1, columns=[`b2`, `a2`], files=[file:/home/vitalii/IdeaProjects/drill-fork/exec/java-exec/src/test/resources/project/pushdown/empty0.json]]]) : rowType = RecordType(ANY b2, ANY a2): rowcount = 1.0, cumulative cost = {0.0 rows, 0.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 926
{code}
Left join with empty tables should not do casting of data types to INT<OPTIONAL>.
The result should be the same as for MergeJoin operator:
{code}
0: jdbc:drill:zk=local> alter session set `planner.enable_hashjoin` = false;
+-------+-----------------------------------+
| ok | summary |
+-------+-----------------------------------+
| true | planner.enable_hashjoin updated. |
+-------+-----------------------------------+
1 row selected (0.087 seconds)
0: jdbc:drill:zk=local> alter session set `planner.enable_mergejoin` = true;
+-------+------------------------------------+
| ok | summary |
+-------+------------------------------------+
| true | planner.enable_mergejoin updated. |
+-------+------------------------------------+
1 row selected (0.073 seconds)
0: jdbc:drill:zk=local> select t1.a1, t1.b1, t2.a2, t2.b2 from dfs.`/home/vitalii/IdeaProjects/drill-fork/exec/java-exec/target/test-classes/jsoninput/nullable1.json` t1 left join dfs.`/home/vitalii/IdeaProjects/drill-fork/exec/java-exec/src/test/resources/project/pushdown/empty0.json` t2 on t1.b1 = t2.b2;
+-----+-------+-------+-------+
| a1 | b1 | a2 | b2 |
+-----+-------+-------+-------+
| 1 | abc | null | null |
| 2 | null | null | null |
+-----+-------+-------+-------+
2 rows selected (0.624 seconds)
{code}
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