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

    https://github.com/apache/spark/pull/15704#discussion_r86296115
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/command/ddl.scala ---
    @@ -418,27 +419,56 @@ case class AlterTableRenamePartitionCommand(
      */
     case class AlterTableDropPartitionCommand(
         tableName: TableIdentifier,
    -    specs: Seq[TablePartitionSpec],
    +    specs: Seq[Expression],
         ifExists: Boolean,
         purge: Boolean)
    -  extends RunnableCommand {
    +  extends RunnableCommand with PredicateHelper {
    +
    +  private def hasNonEqualToComparison(expr: Expression): Boolean = {
    +    expr.find(e => e.isInstanceOf[BinaryComparison] && 
!e.isInstanceOf[EqualTo]).isDefined
    +  }
     
       override def run(sparkSession: SparkSession): Seq[Row] = {
         val catalog = sparkSession.sessionState.catalog
         val table = catalog.getTableMetadata(tableName)
    +    val resolver = sparkSession.sessionState.conf.resolver
         DDLUtils.verifyAlterTableType(catalog, table, isView = false)
         DDLUtils.verifyPartitionProviderIsHive(sparkSession, table, "ALTER 
TABLE DROP PARTITION")
     
    -    val normalizedSpecs = specs.map { spec =>
    -      PartitioningUtils.normalizePartitionSpec(
    -        spec,
    -        table.partitionColumnNames,
    -        table.identifier.quotedString,
    -        sparkSession.sessionState.conf.resolver)
    +    specs.foreach { expr =>
    +      expr.references.foreach { attr =>
    +        if (!table.partitionColumnNames.exists(resolver(_, attr.name))) {
    +          throw new AnalysisException(s"${attr.name} is not a valid 
partition column " +
    +            s"in table ${table.identifier.quotedString}.")
    +        }
    +      }
         }
     
    -    catalog.dropPartitions(
    -      table.identifier, normalizedSpecs, ignoreIfNotExists = ifExists, 
purge = purge)
    +    if (specs.exists(hasNonEqualToComparison)) {
    +      specs.foreach { spec =>
    +        val partitions = catalog.listPartitionsByFilter(table.identifier, 
Seq(spec))
    +        if (partitions.nonEmpty) {
    +          catalog.dropPartitions(
    +            table.identifier, partitions.map(_.spec), ignoreIfNotExists = 
ifExists, purge = purge)
    +        } else if (!ifExists) {
    +          throw new AnalysisException(s"There is no partition for $spec.")
    --- End diff --
    
    
https://github.com/apache/hive/blob/345353c0ea5d3ddda9f6d89cbf8cd0e92726fcb6/ql/src/java/org/apache/hadoop/hive/ql/metadata/Hive.java#L2288
    
    I think it should be "Partition or table doesn't exist."


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