Github user DaveBirdsall commented on a diff in the pull request:
https://github.com/apache/incubator-trafodion/pull/590#discussion_r70332990
--- Diff: core/sql/common/MiscType.h ---
@@ -106,25 +118,63 @@ class SQLBoolean : public NAType
CollHeap* h,
UInt32 *flags = NULL) const;
+ // ---------------- Methods not inherited from NAType ----------------
+
+ NABoolean canBeSQLUnknown() const { return sqlUnknownFlag_;}
+
+ private:
+ NABoolean sqlUnknownFlag_;
--- End diff --
So, the reason SQLBooleanRelat is a different class than SQLBooleanNative
is that SQLBooleanRelat has to model the three-valued logic of SQL predicates
(that is, true/false/unknown), while SQLBooleanNative has to model a possibly
nullable two-value logic (true/false/null).
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