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The change in HIVE-5313 converts the octal string into short using Short.parseShort(scratchDirPermission) but Short.parseShort function expects decimal. So "700" gets converted to 700 instead of 448.
Hive does not set explicit permissions on hive.exec.scratchdir
HIVE-4487 breaks build because 0.20.2 is missing FSPermission(string)