Github user zellerh commented on a diff in the pull request:
https://github.com/apache/incubator-trafodion/pull/618#discussion_r72299340
--- Diff: core/sql/optimizer/NATable.cpp ---
@@ -86,6 +86,10 @@
#include "CmpMain.h"
#define MAX_NODE_NAME 9
+#define MAX_PRECISION_ALLOWED 18
+#define HIVE_MAX_PRECISION_ALLOWED 38
+#define MAX_SCALE_ALLOWED 6
--- End diff --
I don't think there is a maximum scale, neither for Hive nor for Trafodion.
The only condition right now is that the scale can't exceed the precision.
Example of a valid scale: DECIMAL(18,18).
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