Nullity Error When Querying MAX On Non-Numeric Column

[ashishjayamohan]

When querying the MAX of a column, we use NonScanBasedAggregationOperator to use the stored metadata. This produces a nullity error on non-numeric columns as these columns do not have a stored max value. Ideally, this should produce a more informative error that states this aforementioned reason.

[Jackie-Jiang]

Hmm, it is actually a NumberFormatException which is expected because MAX only works on numbers as of now

[ashishjayamohan]

Correct, I updated to not be NPE. I think it would be better to state this error more informatively (rather than "null," state type)

[Jackie-Jiang]

"null" is the actual string value, which cannot be parsed as number