Add a v1 test

Author: MaxGekk

sql/core/src/test/scala/org/apache/spark/sql/execution/command/v1/AlterTableDropPartitionSuite.scala

@@ -21,6 +21,16 @@ import org.apache.spark.sql.execution.command
 
 trait AlterTableDropPartitionSuiteBase extends command.AlterTableDropPartitionSuiteBase {
   override protected val notFullPartitionSpecErr = "The following partitions not found in table"
+
+  test("purge partition data") {
+    withNamespaceAndTable("ns", "tbl") { t =>
+      sql(s"CREATE TABLE $t (id bigint, data string) $defaultUsing PARTITIONED BY (id)")
+      sql(s"ALTER TABLE $t ADD PARTITION (id = 1)")
+      checkPartitions(t, Map("id" -> "1"))
+      sql(s"ALTER TABLE $t DROP PARTITION (id = 1) PURGE")
+      checkPartitions(t) // no partitions
+    }
+  }
 }
 
 class AlterTableDropPartitionSuite