[jira] [Created] (DRILL-1936) Throw an error if subquery in the where clause does not return scalar result

["Victoria Markman (JIRA)" <ji...@apache.org>]

Victoria Markman created DRILL-1936:
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             Summary: Throw an error if subquery in the where clause does not return scalar result
                 Key: DRILL-1936
                 URL: https://issues.apache.org/jira/browse/DRILL-1936
             Project: Apache Drill
          Issue Type: Bug
            Reporter: Victoria Markman


When result of a subquery is non scalar (regardless of if it is correlated or not) we should throw  an error either during planning time or during runtime when we know cardinality of the result set.

Currently, queries either fail to plan:

{code}
0: jdbc:drill:schema=dfs> select * from cp.`tpch/nation.parquet`  where n_name = ( select r_name from cp.`tpch/region.parquet` where n_regionkey = r_regionkey);
Query failed: Query failed: Unexpected exception during fragment initialization: Node [rel#24659:Subset#7.LOGICAL.ANY([]).[]] could not be implemented; planner state:

Root: rel#24659:Subset#7.LOGICAL.ANY([]).[]
Original rel:
AbstractConverter(subset=[rel#24659:Subset#7.LOGICAL.ANY([]).[]], convention=[LOGICAL], DrillDistributionTraitDef=[ANY([])], sort=[[]]): rowcount = 1.7976931348623157E308, cumulative cost = {inf}, id = 24660
  ProjectRel(subset=[rel#24658:Subset#7.NONE.ANY([]).[]], *=[$0]): rowcount = 1.7976931348623157E308, cumulative cost = {1.7976931348623157E308 rows, 1.7976931348623157E308 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 24657
    FilterRel(subset=[rel#24656:Subset#6.NONE.ANY([]).[]], condition=[=($1, $2)]): rowcount = 2.6965397022934733E307, cumulative cost = {2.6965397022934733E307 rows, 1.7976931348623157E308 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 24655
      JoinRel(subset=[rel#24654:Subset#5.NONE.ANY([]).[]], condition=[true], joinType=[left]): rowcount = 1.7976931348623157E308, cumulative cost = {1.7976931348623157E308 rows, 0.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 24653
        EnumerableTableAccessRel(subset=[rel#24645:Subset#0.ENUMERABLE.ANY([]).[]], table=[[cp, tpch/nation.parquet]]): rowcount = 100.0, cumulative cost = {100.0 rows, 101.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 24623
        AggregateRel(subset=[rel#24652:Subset#4.NONE.ANY([]).[]], group=[{}], agg#0=[SINGLE_VALUE($0)]): rowcount = 1.7976931348623158E307, cumulative cost = {1.7976931348623158E307 rows, 0.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 24651
          ProjectRel(subset=[rel#24650:Subset#3.NONE.ANY([]).[]], r_name=[$3]): rowcount = 1.7976931348623157E308, cumulative cost = {1.7976931348623157E308 rows, 1.7976931348623157E308 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 24649
            FilterRel(subset=[rel#24648:Subset#2.NONE.ANY([]).[]], condition=[=($1, $2)]): rowcount = 15.0, cumulative cost = {15.0 rows, 100.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 24647
              EnumerableTableAccessRel(subset=[rel#24646:Subset#1.ENUMERABLE.ANY([]).[]], table=[[cp, tpch/region.parquet]]): rowcount = 100.0, cumulative cost = {100.0 rows, 101.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 24624
{code}

or return strange error messages that are difficult to decipher:

{code}
0: jdbc:drill:schema=dfs> select  a.emp_num,
. . . . . . . . . . . . >         a.emp_name
. . . . . . . . . . . . > from    `emp1.json` as a
. . . . . . . . . . . . > where   a.salary > (
. . . . . . . . . . . . >                 select  b.salary
. . . . . . . . . . . . >                 from    `emp1.json` b
. . . . . . . . . . . . >                 where   b.dept = a.dept)
. . . . . . . . . . . . > order by 1;
Query failed: Query failed: Failure while running fragment., Schema is currently null.  You must call buildSchema(SelectionVectorMode) before this container can return a schema. [ d800ab5d-aa5b-4371-8cb6-819dccca40aa on atsqa4-134.qa.lab:31010 ]
[ d800ab5d-aa5b-4371-8cb6-819dccca40aa on atsqa4-134.qa.lab:31010 ]
Error: exception while executing query: Failure while executing query. (state=,code=0)
{code}




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