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https://issues.apache.org/jira/browse/DRILL-6260?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Volodymyr Vysotskyi resolved DRILL-6260.
----------------------------------------
Resolution: Fixed
Fix Version/s: 1.16.0
Fixed in DRILL-5188
> Query fails with "ERROR: Non-scalar sub-query used in an expression" when it
> contains a cast expression around a scalar sub-query
> ----------------------------------------------------------------------------------------------------------------------------------
>
> Key: DRILL-6260
> URL: https://issues.apache.org/jira/browse/DRILL-6260
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization
> Affects Versions: 1.13.0, 1.14.0
> Environment: git Commit ID: dd4a46a6c57425284a2b8c68676357f947e01988
> git Commit Message: Update version to 1.14.0-SNAPSHOT
> Reporter: Abhishek Girish
> Assignee: Hanumath Rao Maduri
> Priority: Major
> Fix For: 1.16.0
>
>
> {code}
> > explain plan for SELECT T1.b FROM `t1.json` T1 WHERE T1.a = (SELECT
> > cast(max(T2.a) as varchar) FROM `t2.json` T2);
> Error: UNSUPPORTED_OPERATION ERROR: Non-scalar sub-query used in an expression
> See Apache Drill JIRA: DRILL-1937
> {code}
> Slightly different variants of the query work fine.
> {code}
> > explain plan for SELECT T1.b FROM `t1.json` T1 WHERE T1.a = (SELECT
> > max(cast(T2.a as varchar)) FROM `t2.json` T2);
> 00-00 Screen
> 00-01 Project(b=[$0])
> 00-02 Project(b=[$1])
> 00-03 SelectionVectorRemover
> 00-04 Filter(condition=[=($0, $2)])
> 00-05 NestedLoopJoin(condition=[true], joinType=[left])
> 00-07 Scan(table=[[si, tmp, t1.json]],
> groupscan=[EasyGroupScan [selectionRoot=maprfs:/tmp/t1.json, numFiles=1,
> columns=[`a`, `b`], files=[maprfs:///tmp/t1.json]]])
> 00-06 StreamAgg(group=[{}], EXPR$0=[MAX($0)])
> 00-08 Project($f0=[CAST($0):VARCHAR(65535) CHARACTER SET
> "UTF-16LE" COLLATE "UTF-16LE$en_US$primary"])
> 00-09 Scan(table=[[si, tmp, t2.json]],
> groupscan=[EasyGroupScan [selectionRoot=maprfs:/tmp/t2.json, numFiles=1,
> columns=[`a`], files=[maprfs:///tmp/t2.json]]]){code}
> {code}
> > explain plan for SELECT T1.b FROM `t1.json` T1 WHERE T1.a = (SELECT
> > max(T2.a) FROM `t2.json` T2);
> 00-00 Screen
> 00-01 Project(b=[$0])
> 00-02 Project(b=[$1])
> 00-03 SelectionVectorRemover
> 00-04 Filter(condition=[=($0, $2)])
> 00-05 NestedLoopJoin(condition=[true], joinType=[left])
> 00-07 Scan(table=[[si, tmp, t1.json]],
> groupscan=[EasyGroupScan [selectionRoot=maprfs:/tmp/t1.json, numFiles=1,
> columns=[`a`, `b`], files=[maprfs:///tmp/t1.json]]])
> 00-06 StreamAgg(group=[{}], EXPR$0=[MAX($0)])
> 00-08 Scan(table=[[si, tmp, t2.json]],
> groupscan=[EasyGroupScan [selectionRoot=maprfs:/tmp/t2.json, numFiles=1,
> columns=[`a`], files=[maprfs:///tmp/t2.json]]])
> {code}
> File contents:
> {code}
> # cat t1.json
> {"a":1, "b":"V"}
> {"a":2, "b":"W"}
> {"a":3, "b":"X"}
> {"a":4, "b":"Y"}
> {"a":5, "b":"Z"}
> # cat t2.json
> {"a":1, "b":"A"}
> {"a":2, "b":"B"}
> {"a":3, "b":"C"}
> {"a":4, "b":"D"}
> {"a":5, "b":"E"}
> {code}
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