Expect_column_values_to_be_in_set not counting null values as unexpected in GX 1.3.1

GX Core Support
1

I’m using Great Expectations v1.3.1 with the Fluent (Validator-based) API to validate a simple rule:

Check if all values in a column are equal to "mango" using expect_column_values_to_be_in_set.

Here’s what I noticed:

  • When the column contains null (None/NaN) values, they are not being counted as unexpected.
  • I expect null values to be treated as failures

Any guidance or workarounds would be appreciated!