Major Description
There seems to be a bug in the Spark SQL parser when I use windowing functions. Specifically, when the SELECT refers to a column from an inner select block, the parser throws an error.
Here is an example:
--------------------------
When I use a windowing function and add a '1' constant to the result,
select Rank() OVER ( ORDER BY D1.c3 ) + 1 as c1
The Spark SQL parser works. The whole SQL is:
select Rank() OVER ( ORDER BY D1.c3 ) + 1 as c1,
D1.c3 as c3,
D1.c4 as c4,
D1.c5 as c5
from
(select T3671.ROW_WID as c3,
T3671.CAL_MONTH as c4,
T3671.CAL_YEAR as c5,
1 as c6
from
W_DAY_D T3671
) D1
However, if I change the projection so that it refers to a column in an inner select block, D1.C6, whose value is itself a '1' literal, so it is functionally equivalent to the SQL above, Spark SQL will throw an error:
select Rank() OVER ( ORDER BY D1.c3 ) + D1.C6 as c1,
D1.c3 as c3,
D1.c4 as c4,
D1.c5 as c5
from
(select T3671.ROW_WID as c3,
T3671.CAL_MONTH as c4,
T3671.CAL_YEAR as c5,
1 as c6
from
W_DAY_D T3671
) D1
The error message is:
. . . . . . . . . . . . . . . .> java.lang.NullPointerException
Error: org.apache.spark.sql.AnalysisException: resolved attribute(s) c6#3386 missing from c5#3390
,c3#3383,c4#3389,_we0#3461,c3#3388 in operator !Project [c3#3388,c4#3389,c5#3390,c3#3383,_we0#346
1,(_we0#3461 + c6#3386) AS c1#3387]; (state=,code=0)
The above example is a simplified version of the SQL I was testing. The full SQL I was using, which fails with a similar error, is as follows:
select Case when case D1.c6 when 1 then D1.c3 else NULL end is not null then Rank() OVER ( ORDER BY case when ( case D1.c6 when 1 then D1.c3 else NULL end ) is null then 1 else 0 end, case D1.c6 when 1 then D1.c3 else NULL end ) end as c1, Case when case D1.c7 when 1 then D1.c3 else NULL end is not null then Rank() OVER ( PARTITION BY D1.c4, D1.c5 ORDER BY case when ( case D1.c7 when 1 then D1.c3 else NULL end ) is null then 1 else 0 end, case D1.c7 when 1 then D1.c3 else NULL end ) end as c2, D1.c3 as c3, D1.c4 as c4, D1.c5 as c5 from (select T3671.ROW_WID as c3, T3671.CAL_MONTH as c4, T3671.CAL_YEAR as c5, ROW_NUMBER() OVER (PARTITION BY T3671.CAL_MONTH, T3671.CAL_YEAR ORDER BY T3671.CAL_MONTH DESC, T3671.CAL_YEAR DESC) as c6, ROW_NUMBER() OVER (PARTITION BY T3671.CAL_MONTH, T3671.CAL_YEAR, T3671.ROW_WID ORDER BY T3671.CAL_MONTH DESC, T3671.CAL_YEAR DESC, T3671.ROW_WID DESC) as c7 from W_DAY_D T3671 ) D1
Hopefully when fixed, both these sample SQLs should work!
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