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https://issues.apache.org/jira/browse/SPARK-12102?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yin Huai updated SPARK-12102:
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Assignee: Dilip Biswal
> Cast a non-nullable struct field to a nullable field during analysis
> --------------------------------------------------------------------
>
> Key: SPARK-12102
> URL: https://issues.apache.org/jira/browse/SPARK-12102
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Yin Huai
> Assignee: Dilip Biswal
> Fix For: 2.0.0
>
>
> If you try {{sqlContext.sql("select case when 1>0 then struct(1, 2, 3,
> cast(hash(4) as int)) else struct(1, 2, 3, 4) end").printSchema}}, you will
> see {{org.apache.spark.sql.AnalysisException: cannot resolve 'CASE WHEN (1 >
> 0) THEN
> struct(1,2,3,cast(HiveGenericUDF#org.apache.hadoop.hive.ql.udf.generic.GenericUDFHash(4)
> as int)) ELSE struct(1,2,3,4)' due to data type mismatch: THEN and ELSE
> expressions should all be same type or coercible to a common type; line 1 pos
> 85}}.
> The problem is the nullability difference between {{4}} (non-nullable) and
> {{hash(4)}} (nullable).
> Seems it makes sense to cast the nullability in the analysis.
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