Github user gatorsmile commented on a diff in the pull request:
    --- Diff: 
sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveExternalCatalog.scala ---
    @@ -1175,6 +1205,27 @@ private[spark] class HiveExternalCatalog(conf: 
SparkConf, hadoopConf: Configurat
         client.listFunctions(db, pattern)
    +  /** Detect whether a table is stored with Hive-compatible metadata. */
    +  private def isHiveCompatible(table: CatalogTable): Boolean = {
    +    val provider = 
    +    if (provider.isDefined && provider != Some(DDLUtils.HIVE_PROVIDER)) {
    + match {
    +        case Some(value) =>
    +          value.toBoolean
    +        case _ =>
    +          // If the property is not set, the table may have been created 
by an old version
    +          // of Spark. Detect Hive compatibility by comparing the table's 
serde with the
    +          // serde for the table's data source. If they match, the table 
is Hive-compatible.
    +          // If they don't, they're not, because of some other table 
property that made it
    +          // not initially Hive-compatible.
    +          HiveSerDe.sourceToSerDe(provider.get) ==
    --- End diff --
    cc @cloud-fan 

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