Github user omalley commented on a diff in the pull request:
https://github.com/apache/orc/pull/40#discussion_r69779322
--- Diff: java/core/src/java/org/apache/orc/OrcConf.java ---
@@ -82,6 +82,12 @@
"If ORC reader encounters corrupt data, this value will be used
to\n" +
"determine whether to skip the corrupt data or throw
exception.\n" +
"The default behavior is to throw exception."),
+ TOLERATE_MISSING_SCHEMA("orc.tolerate.missing.schema",
+ "hive.exec.orc.tolerate.missing.schema",
+ true,
+ "Writers earlier than HIVE-4243 may have inaccurate schema
metadata.\n"
+ + "This setting will enable best effort schema evolution
rather\n"
--- End diff --
I'd suggest that the comment include something about using position in the
top level structure as the fallback and that it support adding new columns to
the end and changing types, but not deleting or reordering the top level
columns.
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