Github user liancheng commented on a diff in the pull request:

    https://github.com/apache/spark/pull/13756#discussion_r69541158
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/rules.scala 
---
    @@ -206,7 +207,39 @@ private[sql] case class PreWriteCheck(conf: SQLConf, 
catalog: SessionCatalog)
             // The relation in l is not an InsertableRelation.
             failAnalysis(s"$l does not allow insertion.")
     
    +      case c: CreateTableCommand =>
    +        val allColNamesInSchema = c.table.schema.map(_.name)
    +        val colNames = 
allColNamesInSchema.diff(c.table.partitionColumnNames)
    +        val partitionColumnNames = c.table.partitionColumnNames
    +        // Duplicates are not allowed in partitionBy
    +        // Todo: when bucketBy and sortBy are supported, we also need to 
ban the duplication.
    +        checkDuplicates(partitionColumnNames, "Partition")
    +        // Ensuring whether no duplicate name is used in table definition
    +        checkDuplicates(colNames, s"table definition of 
${c.table.identifier}")
    +        // For non-data-source tables, partition columns must not be part 
of the schema
    +        val badPartCols = 
partitionColumnNames.toSet.intersect(colNames.toSet)
    --- End diff --
    
    Again, this line is using case sensitive comparison.


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