Details
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Bug
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Status: Resolved
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Blocker
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Resolution: Not A Bug
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Impala 2.5.0
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None
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DB: functional
Description
The following query returns 1000 rows with no NULLS.
Query:
SELECT
COALESCE(
LEAD('251', 70) OVER (ORDER BY a3.smallint_col DESC, a3.int_col DESC),
LEAD('168', 64) OVER (ORDER BY a3.smallint_col DESC, a4.double_col ASC)
) AS char_col
FROM
alltypes a3
INNER JOIN alltypesagg a4 ON ((a4.date_string_col) = (a3.date_string_col)) AND ((a4.day) = (a3.bigint_col))
However the following 2 queries, which are subsets return NULLS.
SELECT
LEAD('251', 70) OVER (ORDER BY a3.smallint_col DESC, a3.int_col DESC)
FROM
alltypes a3
INNER JOIN alltypesagg a4 ON ((a4.date_string_col) = (a3.date_string_col)) AND ((a4.day) = (a3.bigint_col))
SELECT
LEAD('168', 64) OVER (ORDER BY a3.smallint_col DESC, a4.double_col ASC)
FROM
alltypes a3
INNER JOIN alltypesagg a4 ON ((a4.date_string_col) = (a3.date_string_col)) AND ((a4.day) = (a3.bigint_col))
Also when the original query is executed in Postgres, some NULLS are returned.