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Posted to issues@spark.apache.org by "Yin Huai (JIRA)" <ji...@apache.org> on 2016/10/11 02:00:26 UTC
[jira] [Created] (SPARK-17863) SELECT distinct does not work if
there is a order by clause
Yin Huai created SPARK-17863:
--------------------------------
Summary: SELECT distinct does not work if there is a order by clause
Key: SPARK-17863
URL: https://issues.apache.org/jira/browse/SPARK-17863
Project: Spark
Issue Type: Bug
Components: SQL
Reporter: Yin Huai
Priority: Critical
{code}
select distinct struct.a, struct.b
from (
select named_struct('a', 1, 'b', 2, 'c', 3) as struct
union all
select named_struct('a', 1, 'b', 2, 'c', 4) as struct) tmp
order by struct.a, struct.b
{code}
This query generates
{code}
+---+---+
| a| b|
+---+---+
| 1| 2|
| 1| 2|
+---+---+
{code}
The plan is wrong
{code}
== Parsed Logical Plan ==
'Sort ['struct.a ASC, 'struct.b ASC], true
+- 'Distinct
+- 'Project ['struct.a, 'struct.b]
+- 'SubqueryAlias tmp
+- 'Union
:- 'Project ['named_struct(a, 1, b, 2, c, 3) AS struct#21805]
: +- OneRowRelation$
+- 'Project ['named_struct(a, 1, b, 2, c, 4) AS struct#21806]
+- OneRowRelation$
== Analyzed Logical Plan ==
a: int, b: int
Project [a#21819, b#21820]
+- Sort [struct#21805.a ASC, struct#21805.b ASC], true
+- Distinct
+- Project [struct#21805.a AS a#21819, struct#21805.b AS b#21820, struct#21805]
+- SubqueryAlias tmp
+- Union
:- Project [named_struct(a, 1, b, 2, c, 3) AS struct#21805]
: +- OneRowRelation$
+- Project [named_struct(a, 1, b, 2, c, 4) AS struct#21806]
+- OneRowRelation$
== Optimized Logical Plan ==
Project [a#21819, b#21820]
+- Sort [struct#21805.a ASC, struct#21805.b ASC], true
+- Aggregate [a#21819, b#21820, struct#21805], [a#21819, b#21820, struct#21805]
+- Union
:- Project [1 AS a#21819, 2 AS b#21820, [1,2,3] AS struct#21805]
: +- OneRowRelation$
+- Project [1 AS a#21819, 2 AS b#21820, [1,2,4] AS struct#21806]
+- OneRowRelation$
== Physical Plan ==
*Project [a#21819, b#21820]
+- *Sort [struct#21805.a ASC, struct#21805.b ASC], true, 0
+- Exchange rangepartitioning(struct#21805.a ASC, struct#21805.b ASC, 200)
+- *HashAggregate(keys=[a#21819, b#21820, struct#21805], functions=[], output=[a#21819, b#21820, struct#21805])
+- Exchange hashpartitioning(a#21819, b#21820, struct#21805, 200)
+- *HashAggregate(keys=[a#21819, b#21820, struct#21805], functions=[], output=[a#21819, b#21820, struct#21805])
+- Union
:- *Project [1 AS a#21819, 2 AS b#21820, [1,2,3] AS struct#21805]
: +- Scan OneRowRelation[]
+- *Project [1 AS a#21819, 2 AS b#21820, [1,2,4] AS struct#21806]
+- Scan OneRowRelation[]
{code}
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