Merge pull request ClickHouse#62524 from helifu/master

Fix a bug moving one partition from one to itself

Author: yariks5s

src/Storages/MergeTree/MergeTreeData.cpp

@@ -5065,6 +5065,25 @@ void MergeTreeData::movePartitionToVolume(const ASTPtr & partition, const String
     }
 }
 
+void MergeTreeData::movePartitionToTable(const PartitionCommand & command, ContextPtr query_context)
+{
+    String dest_database = query_context->resolveDatabase(command.to_database);
+    auto dest_storage = DatabaseCatalog::instance().getTable({dest_database, command.to_table}, query_context);
+
+    /// The target table and the source table are the same.
+    if (dest_storage->getStorageID() == this->getStorageID())
+        return;
+
+    auto * dest_storage_merge_tree = dynamic_cast<MergeTreeData *>(dest_storage.get());
+    if (!dest_storage_merge_tree)
+        throw Exception(ErrorCodes::NOT_IMPLEMENTED,
+            "Cannot move partition from table {} to table {} with storage {}",
+            getStorageID().getNameForLogs(), dest_storage->getStorageID().getNameForLogs(), dest_storage->getName());
+
+    dest_storage_merge_tree->waitForOutdatedPartsToBeLoaded();
+    movePartitionToTable(dest_storage, command.partition, query_context);
+}
+
 void MergeTreeData::movePartitionToShard(const ASTPtr & /*partition*/, bool /*move_part*/, const String & /*to*/, ContextPtr /*query_context*/)
 {
     throw Exception(ErrorCodes::NOT_IMPLEMENTED, "MOVE PARTITION TO SHARD is not supported by storage {}", getName());
@@ -5141,20 +5160,8 @@ Pipe MergeTreeData::alterPartition(
                         break;
 
                     case PartitionCommand::MoveDestinationType::TABLE:
-                    {
-                        String dest_database = query_context->resolveDatabase(command.to_database);
-                        auto dest_storage = DatabaseCatalog::instance().getTable({dest_database, command.to_table}, query_context);
-
-                        auto * dest_storage_merge_tree = dynamic_cast<MergeTreeData *>(dest_storage.get());
-                        if (!dest_storage_merge_tree)
-                            throw Exception(ErrorCodes::NOT_IMPLEMENTED,
-                                "Cannot move partition from table {} to table {} with storage {}",
-                                getStorageID().getNameForLogs(), dest_storage->getStorageID().getNameForLogs(), dest_storage->getName());
-
-                        dest_storage_merge_tree->waitForOutdatedPartsToBeLoaded();
-                        movePartitionToTable(dest_storage, command.partition, query_context);
-                    }
-                    break;
+                        movePartitionToTable(command, query_context);
+                        break;
 
                     case PartitionCommand::MoveDestinationType::SHARD:
                     {

src/Storages/MergeTree/MergeTreeData.h

@@ -790,6 +790,9 @@ class MergeTreeData : public IStorage, public WithMutableContext
     /// Moves partition to specified Volume
     void movePartitionToVolume(const ASTPtr & partition, const String & name, bool moving_part, ContextPtr context);
 
+    /// Moves partition to specified Table
+    void movePartitionToTable(const PartitionCommand & command, ContextPtr query_context);
+
     /// Checks that Partition could be dropped right now
     /// Otherwise - throws an exception with detailed information.
     /// We do not use mutex because it is not very important that the size could change during the operation.

tests/queries/0_stateless/03038_move_partition_to_oneself_deadlock.reference

@@ -0,0 +1,2 @@
+tuple()	1000000
+tuple()	1000000

tests/queries/0_stateless/03038_move_partition_to_oneself_deadlock.sql

@@ -0,0 +1,6 @@
+DROP TABLE IF EXISTS move_partition_to_oneself;
+CREATE TABLE move_partition_to_oneself (key UInt64 CODEC(NONE)) ENGINE = MergeTree ORDER BY tuple();
+INSERT INTO move_partition_to_oneself SELECT number FROM numbers(1e6);
+SELECT partition, rows FROM system.parts WHERE database = currentDatabase() AND table = 'move_partition_to_oneself' and active;
+ALTER TABLE move_partition_to_oneself MOVE PARTITION tuple() TO TABLE move_partition_to_oneself;
+SELECT partition, rows FROM system.parts WHERE database = currentDatabase() AND table = 'move_partition_to_oneself' and active;