0a2c6cc013
two bugs were introduced by the above CL 1. to test if the column value is NULL, getType_native() should check if the columnindiex is valid. (it seems sometimes callers could ask if a given non-existent column is null - and the answer should be true.) 2. if a column is null and isBlob_native, isString_native methods should return true - not false. Change-Id: I64df75d0a3840a4502c00db8759c66ba4b268a26