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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2016/08/24 10:56:21 UTC
[jira] [Assigned] (SPARK-17212) TypeCoercion support widening
conversion between DateType and TimestampType
[ https://issues.apache.org/jira/browse/SPARK-17212?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-17212:
------------------------------------
Assignee: (was: Apache Spark)
> TypeCoercion support widening conversion between DateType and TimestampType
> ---------------------------------------------------------------------------
>
> Key: SPARK-17212
> URL: https://issues.apache.org/jira/browse/SPARK-17212
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Hyukjin Kwon
>
> Currently, type-widening does not work between {{TimestampType}} and {{DateType}}.
> This applies to {{SetOperation}}, {{Union}}, {{In}}, {{CaseWhen}}, {{Greatest}}, {{Leatest}}, {{CreateArray}}, {{CreateMap}} and {{Coalesce}}.
> For a simple example,
> {code}
> Seq(Tuple2(new Timestamp(0), new Date(0))).toDF("a", "b").selectExpr("greatest(a, b)").show()
> {code}
> {code}
> cannot resolve 'greatest(`a`, `b`)' due to data type mismatch: The expressions should all have the same type, got GREATEST(timestamp, date)
> {code}
> or Union as below:
> {code}
> val a = Seq(Tuple1(new Timestamp(0))).toDF()
> val b = Seq(Tuple1(new Date(0))).toDF()
> a.union(b).show()
> {code}
> {code}
> Union can only be performed on tables with the compatible column types. DateType <> TimestampType at the first column of the second table;
> {code}
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