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Posted to issues@spark.apache.org by "Yuming Wang (JIRA)" <ji...@apache.org> on 2019/07/10 06:36:00 UTC
[jira] [Commented] (SPARK-28252) local/global temp view should not
accept duplicate column names
[ https://issues.apache.org/jira/browse/SPARK-28252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16881766#comment-16881766 ]
Yuming Wang commented on SPARK-28252:
-------------------------------------
PostgreSQL also do not support it.
{code:sql}
postgres=# CREATE TEMPORARY VIEW spark_28252 as select 1 as c1, 2 as c1;
ERROR: column "c1" specified more than once
{code}
> local/global temp view should not accept duplicate column names
> ---------------------------------------------------------------
>
> Key: SPARK-28252
> URL: https://issues.apache.org/jira/browse/SPARK-28252
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Yuming Wang
> Priority: Major
>
> {noformat}
> scala> spark.sql("create temp view v1 as select 1 as col1, 2 as col1")
> res0: org.apache.spark.sql.DataFrame = []
> scala> spark.sql("select col1 from v1").show
> 19/07/04 22:27:19 WARN ObjectStore: Failed to get database global_temp, returning NoSuchObjectException
> org.apache.spark.sql.AnalysisException: Reference 'col1' is ambiguous, could be: v1.col1, v1.col1.; line 1 pos 7
> at org.apache.spark.sql.catalyst.expressions.package$AttributeSeq.resolve(package.scala:259)
> at org.apache.spark.sql.catalyst.plans.logical.LogicalPlan.resolveChildren(LogicalPlan.scala:101)
> at org.apache.spark.sql.catalyst.analysis.Analyzer$ResolveReferences$$anonfun$40.apply(Analyzer.scala:890)
> at org.apache.spark.sql.catalyst.analysis.Analyzer$ResolveReferences$$anonfun$40.apply(Analyzer.scala:892)
> at org.apache.spark.sql.catalyst.analysis.package$.withPosition(package.scala:53)
> {noformat}
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