[jira] [Created] (CALCITE-4063) Correlate with Unnest an array of structs causes ClassCastException

["Ruben Q L (Jira)" <ji...@apache.org>]

Ruben Q L created CALCITE-4063:
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             Summary: Correlate with Unnest an array of structs causes ClassCastException
                 Key: CALCITE-4063
                 URL: https://issues.apache.org/jira/browse/CALCITE-4063
             Project: Calcite
          Issue Type: Bug
          Components: core
    Affects Versions: 1.23.0
            Reporter: Ruben Q L


If we run the following queries with UNNEST operator, we get the expected results:
{code:sql}
select * from UNNEST(array[3, 4]) as T2(y);
-- y=3
-- y=4

select * from UNNEST(array[array[3], array[4]]) as T2(y)
-- y=[3]
-- y=[4]

select * from UNNEST(array[ROW(3), ROW(4)]) as T2(y)
-- y=[3]
-- y=[4]
{code}

However, if we try to combine the them with a correlation with some other values, as we could do in more realistic examples: 
{{select * from dept_nested as d, UNNEST(d.employees) e2}}

The first two return the expected results, but the last one throws an exception:
{code:sql}
select * from (values (1), (2)) T1(x), UNNEST(array[3, 4]) as T2(y);
-- x=1; y=3
-- x=1; y=4
-- x=2; y=3
-- x=2; y=4

select * from (values (1), (2)) T1(x), UNNEST(array[array[3], array[4]]) as T2(y);
-- x=1; y=[3]
-- x=1; y=[4]
-- x=2; y=[3]
-- x=2; y=[4]

select * from (values (1), (2)) T1(x), UNNEST(array[ROW(3), ROW(4)]) as T2(y);
-- ERROR!!!
-- java.lang.ClassCastException: org.apache.calcite.runtime.FlatLists$Flat1List cannot be cast to java.lang.Integer
{code}




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