[jira] [Created] (DRILL-6260) Query fails with "UNSUPPORTED_OPERATION ERROR: Non-scalar sub-query used in an expression" when it contains a cast expression around a scalar sub-query

["Abhishek Girish (JIRA)" <ji...@apache.org>]

Abhishek Girish created DRILL-6260:
--------------------------------------

             Summary: Query fails with "UNSUPPORTED_OPERATION 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
            Reporter: Abhishek Girish


{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);

+------+------+
| text | json |
+------+------+
| 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);

+------+------+
| text | json |
+------+------+
| 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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