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https://issues.apache.org/jira/browse/ORC-226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16128067#comment-16128067
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ASF GitHub Bot commented on ORC-226:
------------------------------------
Github user omalley commented on a diff in the pull request:
https://github.com/apache/orc/pull/151#discussion_r133330120
--- 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 --
Maybe we should print an error message with the actual id number if it
isn't recognized. That would let you debug.
> Support getWriterId in c++ reader interface
> -------------------------------------------
>
> Key: ORC-226
> URL: https://issues.apache.org/jira/browse/ORC-226
> Project: ORC
> Issue Type: Sub-task
> Components: C++
> Reporter: Xiening Dai
>
> We just added writer ID to identify files generated by different writers (we
> have three currently). Need an interface for reader to get this ID back.
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