Add file

velox/connectors/hive/FileProperties.h

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+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// A FileHandle is a File pointer plus some (optional, file-type-dependent)
+// extra information for speeding up loading columnar data. For example, when
+// we open a file we might build a hash map saying what region(s) on disk
+// correspond to a given column in a given stripe.
+//
+// The FileHandle will normally be used in conjunction with a CachedFactory
+// to speed up queries that hit the same files repeatedly; see the
+// FileHandleCache and FileHandleFactory.
+
+#pragma once
+
+#include <cstdint>
+
+namespace facebook::velox {
+
+struct FileProperties {
+  int64_t fileSize{-1};
+  int64_t modificationTime{-1};
+};
+
+} // namespace facebook::velox