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Khurram Faraaz updated DRILL-4985: ---------------------------------- Priority: Critical (was: Major) > 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 > Priority: Critical > > 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} > And without the IS NULL check in ( t1.col_int IS NULL AND t2.col_int IS NULL ) > Equality join 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 CAST(t1.col_int AS BIGINT)= CAST(t2.col_int AS BIGINT); > +----------+-----------+ > | col_int | col_int0 | > +----------+-----------+ > | 30410 | 30410 | > | 37420 | 37420 | > | 58583 | 58583 | > | 1 | 1 | > | 20326 | 20326 | > | 19 | 19 | > | 60718 | 60718 | > +----------+-----------+ > 7 rows selected (0.424 seconds) > {noformat} -- This message was sent by Atlassian JIRA (v6.3.4#6332)