Can a cell value retrieved by Getcolumns (notifyprotocol 220) produce null?

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If you retrieve a table via notifyprotocol 220 (Getcolumns), and then you cast a column to an object[], can the value of a cell within that object[] be null?
The column type is Retrieved, and Numeric Text, double, length: next param.

Marieke Goethals [SLC] [DevOps Catalyst] Selected answer as best 19th July 2023

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A NotifyProtocol 220 is NT_FILL_ARRAY_WITH_COLUMN. I think you mean NotifyProtocol 321 NT_GET_TABLE_COLUMNS.

It’s depending on which DataMiner version you’re using and how the table was filled in. If you’re using the NotifyProtocol 220 to set the value, then adaptations were done to see this as an actual null when using the NotifyProtocol 321 to get the object again and to be able to distinguish between a real “0” numeric value or “Not Initialized”. See RN 19707, available since 9.5.0 CU11, 9.5.14 CU1

Marieke Goethals [SLC] [DevOps Catalyst] Selected answer as best 19th July 2023