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https://issues.apache.org/jira/browse/CALCITE-4063?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Ruben Q L updated CALCITE-4063:
-------------------------------
    Description: 
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]
-- Is this result ok? (see first comment below)
{code}

However, if we try to combine 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}


  was:
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 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}



> 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
>            Priority: Major
>
> 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]
> -- Is this result ok? (see first comment below)
> {code}
> However, if we try to combine 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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