Merge pull request #14887 from azat/StorageFile-write-to-fd

Fix SIGSEGV for an attempt to INSERT into StorageFile(fd)

src/Storages/StorageFile.cpp

@@ -502,8 +502,12 @@ BlockOutputStreamPtr StorageFile::write(
     if (format_name == "Distributed")
         throw Exception("Method write is not implemented for Distributed format", ErrorCodes::NOT_IMPLEMENTED);
 
+    std::string path;
+    if (!paths.empty())
+        path = paths[0];
+
     return std::make_shared<StorageFileBlockOutputStream>(*this, metadata_snapshot,
-        chooseCompressionMethod(paths[0], compression_method), context);
+        chooseCompressionMethod(path, compression_method), context);
 }
 
 Strings StorageFile::getDataPaths() const

tests/queries/0_stateless/01500_StorageFile_write_to_fd.sh

+#!/usr/bin/env bash
+
+CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+. "$CURDIR"/../shell_config.sh
+
+# The following command will execute:
+#     CREATE TABLE table (key UInt32) ENGINE = File(TSV, stdin);
+#     INSERT INTO `table` SELECT key FROM input('key UInt32') FORMAT TSV
+${CLICKHOUSE_LOCAL} -S 'key UInt32' -q "INSERT INTO \`table\` SELECT key FROM input('key UInt32') FORMAT TSV" < /dev/null