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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2016/11/29 19:48:58 UTC
[jira] [Assigned] (SPARK-18622) Missing Reference in Multi Union
Clauses Cause by TypeCoercion
[ https://issues.apache.org/jira/browse/SPARK-18622?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-18622:
------------------------------------
Assignee: Apache Spark
> Missing Reference in Multi Union Clauses Cause by TypeCoercion
> --------------------------------------------------------------
>
> Key: SPARK-18622
> URL: https://issues.apache.org/jira/browse/SPARK-18622
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.6.3, 2.0.2
> Reporter: Yerui Sun
> Assignee: Apache Spark
>
> {code}
> spark-sql> explain extended
> > select a
> > from
> > (
> > select 0 a, 0 b
> > union all
> > select sum(1) a, cast(0 as bigint) b
> > union all
> > select 0 a, 0 b
> > )t;
>
> == Parsed Logical Plan ==
> 'Project ['a]
> +- 'SubqueryAlias t
> +- 'Union
> :- 'Union
> : :- Project [0 AS a#0, 0 AS b#1]
> : : +- OneRowRelation$
> : +- 'Project ['sum(1) AS a#2, cast(0 as bigint) AS b#3L]
> : +- OneRowRelation$
> +- Project [0 AS a#4, 0 AS b#5]
> +- OneRowRelation$
>
> == Analyzed Logical Plan ==
> a: int
> Project [a#0]
> +- SubqueryAlias t
> +- Union
> :- !Project [a#0, b#9L]
> : +- Union
> : :- Project [cast(a#0 as bigint) AS a#11L, b#9L]
> : : +- Project [a#0, cast(b#1 as bigint) AS b#9L]
> : : +- Project [0 AS a#0, 0 AS b#1]
> : : +- OneRowRelation$
> : +- Project [a#2L, b#3L]
> : +- Project [a#2L, b#3L]
> : +- Aggregate [sum(cast(1 as bigint)) AS a#2L, cast(0 as bigint) AS b#3L]
> : +- OneRowRelation$
> +- Project [a#4, cast(b#5 as bigint) AS b#10L]
> +- Project [0 AS a#4, 0 AS b#5]
> +- OneRowRelation$
>
> == Optimized Logical Plan ==
> org.apache.spark.sql.AnalysisException: resolved attribute(s) a#0 missing from a#11L,b#9L in operator !Project [a#0, b#9L];;
> Project [a#0]
> +- SubqueryAlias t
> +- Union
> :- !Project [a#0, b#9L]
> : +- Union
> : :- Project [cast(a#0 as bigint) AS a#11L, b#9L]
> : : +- Project [a#0, cast(b#1 as bigint) AS b#9L]
> : : +- Project [0 AS a#0, 0 AS b#1]
> : : +- OneRowRelation$
> : +- Project [a#2L, b#3L]
> : +- Project [a#2L, b#3L]
> : +- Aggregate [sum(cast(1 as bigint)) AS a#2L, cast(0 as bigint) AS b#3L]
> : +- OneRowRelation$
> +- Project [a#4, cast(b#5 as bigint) AS b#10L]
> +- Project [0 AS a#4, 0 AS b#5]
> +- OneRowRelation$
>
> == Physical Plan ==
> org.apache.spark.sql.AnalysisException: resolved attribute(s) a#0 missing from a#11L,b#9L in operator !Project [a#0, b#9L];;
> Project [a#0]
> +- SubqueryAlias t
> +- Union
> :- !Project [a#0, b#9L]
> : +- Union
> : :- Project [cast(a#0 as bigint) AS a#11L, b#9L]
> : : +- Project [a#0, cast(b#1 as bigint) AS b#9L]
> : : +- Project [0 AS a#0, 0 AS b#1]
> : : +- OneRowRelation$
> : +- Project [a#2L, b#3L]
> : +- Project [a#2L, b#3L]
> : +- Aggregate [sum(cast(1 as bigint)) AS a#2L, cast(0 as bigint) AS b#3L]
> : +- OneRowRelation$
> +- Project [a#4, cast(b#5 as bigint) AS b#10L]
> +- Project [0 AS a#4, 0 AS b#5]
> +- OneRowRelation$
> {code}
> Key Points to re-produce issue:
> * 3 or more union clauses;
> * One column is sum aggregate in one union clause, and is Integer type in other union clause;
> * Another column has different date types in union clauses;
> The reason of issue:
> - Step 1: Apply TypeCoercion.WidenSetOperationTypes, add project with cast since the union clauses has different datatypes for one column; With 3 union clauses, the inner union clause also be projected with cast;
> - Step 2: Apply TypeCoercion.FunctionArgumentConversion, the return type of sum(int) will be extended to BigInt, meaning one column in union clauses changed datatype;
> - Step 3: Apply TypeCoercion.WidenSetOperationTypes again, another cast project added in inner union clause, since sum(int) datatype changed; at this point, the reference of project ON inner union will be missed, since the project IN inner union is newly added, see the Analyzed Logical Plan;
> Solutions to fix:
> * Since set operation type coercion should be applied after inner clause be stabled, apply WidenSetOperationTypes at last will fix the issue;
> * To avoiding multi level projects on set operation clause, handle the existing cast project carefully in WidenSetOperationTypes should be also work;
> Appreciate for any comments.
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