Release 10.1A: OpenEdge Development:
ADM Reference

DataColumns

Comma separated list of the columnNames for the SmartDataObject (SDO).

Data type: CHARACTER

Notes:

Read and Write.
The DataColumsByTable property that stores in different tables delimited by CHR(1) instead of a comma in order to identify which columns are from which table in the event of a join. For example, if the query is a join of customer and order and the Name field from customer and the OrderNum and OrderData field from Order are selected, then the property value becomes equal to Name<CHR(1)>OrderNum,OrderDate.
This function replaces CHR(1) with "," and returns just a comma separated list.