Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/14155#discussion_r74166431
  
    --- Diff: 
sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/HiveDDLSuite.scala 
---
    @@ -689,4 +689,38 @@ class HiveDDLSuite
           ))
         }
       }
    +
    +  test("datasource table property keys are not allowed") {
    +    import org.apache.spark.sql.hive.HiveExternalCatalog.DATASOURCE_PREFIX
    +
    +    withTable("tbl") {
    +      sql("CREATE TABLE tbl(a INT) STORED AS parquet")
    +
    +      val e = intercept[AnalysisException] {
    +        sql(s"ALTER TABLE tbl SET TBLPROPERTIES ('${DATASOURCE_PREFIX}foo' 
= 'loser')")
    +      }
    +      assert(e.getMessage.contains(DATASOURCE_PREFIX + "foo"))
    --- End diff --
    
    The `HiveExternalCatalog`. My concern is that, this limitation is because 
of the tricks for hive metastore, so it should only exist in 
`HiveExternalCatalog`, the `InMemoryCatatalog` and our new metastore in the 
future should not have this limitation


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