Github user xndai commented on a diff in the pull request:
https://github.com/apache/orc/pull/151#discussion_r133330343
--- Diff: c++/include/orc/Reader.hh ---
@@ -288,6 +288,17 @@ namespace orc {
virtual uint64_t getCompressionSize() const = 0;
/**
+ * Get ID of writer that generated the file.
+ * Current availiable Orc writers:
+ * 0 = ORC Java
+ * 1 = ORC C++
+ * 2 = Presto
+ * @param id out parameter for writer id
+ * @return true if writer id is availiable, false if otherwise
+ */
+ virtual bool getWriterId(uint32_t & id) const = 0;
--- End diff --
Then we need a logger in Orc library which we don't have now. What's the
problem of returning actual value instead of ORC_FUTURE?
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