Count Distinct Aggregation of an Empty String in a Data Set is Incorrect
(Doc ID 2683188.1)
Last updated on JUNE 22, 2020
Applies to:Oracle Analytics Cloud - Version 105.5.0 to 105.6.0 [Release 105.3]
Information in this document applies to any platform.
1. A Data Set is created from a Subject Area and includes an Attribute column. (For example: Student ID has a text / character datatype.)
2. A Data Flow is created for that Data Set ...
An Add Column step evaluates the Attribute column via a CASE statement, and the new column can be either the same Attribute column value or blank. (For example: CASE WHEN Grade IN ('A','B','C') THEN "Student ID" END)
In the Save Data step of the Data Flow, the new column is set as a Measure column with COUNT DISTINCT aggregation.
... and the Data Flow is run.
3. A Project is created on the output Data Set from the Data Flow but the aggregate value of the new column for blank (empty string) values is incorrect. (For example: See that the aggregate value of the new Column is one (1), when the expected value is (0).)
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