Backport ClickHouse#91304 to 25.8: Fix SYSTEM DROP FILESYSTEM CACHE ON CLUSTER

Author: robot-clickhouse

src/Parsers/ASTSystemQuery.cpp

@@ -163,7 +163,13 @@ void ASTSystemQuery::formatImpl(WriteBuffer & ostr, const FormatSettings & setti
 
     print_keyword("SYSTEM") << " ";
     print_keyword(typeToString(type));
-    if (!cluster.empty())
+
+    std::unordered_set<Type> queries_with_on_cluster_at_end = {
+        Type::DROP_FILESYSTEM_CACHE,
+        Type::SYNC_FILESYSTEM_CACHE,
+    };
+
+    if (!queries_with_on_cluster_at_end.contains(type) && !cluster.empty())
         formatOnCluster(ostr, settings);
 
     switch (type)
@@ -515,6 +521,9 @@ void ASTSystemQuery::formatImpl(WriteBuffer & ostr, const FormatSettings & setti
         case Type::END:
             throw Exception(ErrorCodes::LOGICAL_ERROR, "Unknown SYSTEM command");
     }
+
+    if (queries_with_on_cluster_at_end.contains(type) && !cluster.empty())
+        formatOnCluster(ostr, settings);
 }
 
 

tests/queries/0_stateless/03643_system_drop_filesystem_cache_on_cluster.reference

@@ -0,0 +1,2 @@
+localhost	9000	0		0	0
+localhost	9000	0		0	0

tests/queries/0_stateless/03643_system_drop_filesystem_cache_on_cluster.sh

@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+# Tags: no-fasttest, no-parallel, no-object-storage, no-random-settings
+
+# set -x
+
+CUR_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+# shellcheck source=../shell_config.sh
+. "$CUR_DIR"/../shell_config.sh
+
+
+disk_name="${CLICKHOUSE_TEST_UNIQUE_NAME}"
+$CLICKHOUSE_CLIENT -m --query """
+DROP TABLE IF EXISTS test;
+CREATE TABLE test (a Int32, b String)
+ENGINE = MergeTree() ORDER BY tuple()
+SETTINGS disk = disk(name = '$disk_name', type = cache, max_size = '100Ki', path = ${CLICKHOUSE_TEST_UNIQUE_NAME}, disk = s3_disk);
+
+INSERT INTO test SELECT 1, 'test';
+"""
+
+$CLICKHOUSE_CLIENT --query """
+SYSTEM SYNC FILESYSTEM CACHE '$disk_name' ON CLUSTER 'test_shard_localhost';
+"""
+
+$CLICKHOUSE_CLIENT --query """
+SYSTEM DROP FILESYSTEM CACHE '$disk_name' ON CLUSTER 'test_shard_localhost';
+"""
+
+$CLICKHOUSE_CLIENT --query """
+DROP TABLE IF EXISTS test;
+"""