[GitHub] [spark] dongjoon-hyun commented on a change in pull request #24592: [SPARK-27690][SQL] Refactor HiveClientImpl#reset() to remove materialized view first

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dongjoon-hyun commented on a change in pull request #24592: [SPARK-27690][SQL] Refactor HiveClientImpl#reset() to remove materialized view first
URL: https://github.com/apache/spark/pull/24592#discussion_r283458184
 
 

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 File path: sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveClientImpl.scala
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 @@ -856,20 +856,31 @@ private[hive] class HiveClientImpl(
   }
 
   def reset(): Unit = withHiveState {
-    client.getAllTables("default").asScala.foreach { t =>
-      logDebug(s"Deleting table $t")
-      val table = client.getTable("default", t)
+    val allTables = client.getAllTables("default")
+    val (mvs, others) = allTables.asScala.map(t => client.getTable("default", t))
+      .partition(_.getTableType.toString.equals("MATERIALIZED_VIEW"))
+
+    // Remove materialized view first, otherwise caused a violation of foreign key constraint.
+    mvs.foreach { table =>
+      val tableName = table.getTableName
+      logDebug(s"Deleting materialized view $tableName")
+      client.dropTable("default", table.getTableName)
+    }
+
+    others.foreach { table =>
 
 Review comment:
   `table` -> `t`.
   
   It's always good to reduce the unnecessary patch diff.
   

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