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

    https://github.com/apache/spark/pull/14210#discussion_r71657222
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkSqlParser.scala ---
    @@ -344,6 +344,11 @@ class SparkSqlAstBuilder(conf: SQLConf) extends 
AstBuilder {
             table, provider, partitionColumnNames, bucketSpec, mode, options, 
query)
         } else {
           val struct = Option(ctx.colTypeList()).map(createStructType)
    +      if (struct.isEmpty && bucketSpec.nonEmpty) {
    --- End diff --
    
    In that case, partition columns are inferred at runtime. Thus, although we 
ignore user specified partition columns, but we still treat the table as a 
partition table. 
    
    Here, we will really ignore the bucket spec, because the bucket columns are 
not inferred at runtime. That means, we will not treat it as a bucket table. 
That is the major reason why this PR issues the exception.
    
    Let me know if Log message is still better here. Thanks!


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