Khurram Faraaz created DRILL-4985:
-------------------------------------
Summary: CAST in join predicate in null equality join - "query
cannot be planned error"
Key: DRILL-4985
URL: https://issues.apache.org/jira/browse/DRILL-4985
Project: Apache Drill
Issue Type: Bug
Components: Query Planning & Optimization
Affects Versions: 1.9.0
Reporter: Khurram Faraaz
Use of CAST in join predicate results in, "query cannot be planned error", in a
Null Equality Join.
Drill 1.9.0, git commit ID: a29f1e29
{noformat}
0: jdbc:drill:schema=dfs.tmp> SELECT t1.col_int , t2.col_int FROM typeall_l t1,
typeall_r t2 WHERE CAST(t1.col_int AS BIGINT)= CAST(t2.col_int AS BIGINT) OR (
t1.col_int IS NULL AND t2.col_int IS NULL );
Error: UNSUPPORTED_OPERATION ERROR: This query cannot be planned possibly due
to either a cartesian join or an inequality join
[Error Id: 10452a20-c0a7-45b1-8ee7-065b28484738 on centos-01.qa.lab:31010]
(state=,code=0)
{noformat}
{noformat}
0: jdbc:drill:schema=dfs.tmp> SELECT t1.col_int , t2.col_int FROM typeall_l t1,
typeall_r t2 WHERE CAST(t1.col_int AS BIGINT)= CAST(t2.col_int AS BIGINT) OR (
CAST(t1.col_int AS BIGINT) IS NULL AND CAST(t2.col_int AS BIGINT) IS NULL );
Error: UNSUPPORTED_OPERATION ERROR: This query cannot be planned possibly due
to either a cartesian join or an inequality join
[Error Id: ca8eba6c-b8c0-42d9-a0a0-16e94f887280 on centos-01.qa.lab:31010]
(state=,code=0)
{noformat}
Whereas, without the CAST to BIGINT in the join predicate, query returns
correct results.
{noformat}
0: jdbc:drill:schema=dfs.tmp> SELECT t1.col_int , t2.col_int FROM typeall_l t1,
typeall_r t2 WHERE t1.col_int = t2.col_int OR ( t1.col_int IS NULL AND
t2.col_int IS NULL );
+----------+-----------+
| col_int | col_int0 |
+----------+-----------+
| 30410 | 30410 |
| 37420 | 37420 |
| 58583 | 58583 |
| 1 | 1 |
| null | null |
| null | null |
| null | null |
| 20326 | 20326 |
| null | null |
| null | null |
| null | null |
| 19 | 19 |
| 60718 | 60718 |
| null | null |
| null | null |
| null | null |
+----------+-----------+
16 rows selected (0.304 seconds)
{noformat}
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