IsNull filtering not working (IndexNullState is true)

[mbretter]

Hi,

I am trying to filter for "IsNull" on a nullable string field.
IndexNullState is set to true.

        {
            "name": "parentProductId",
            "dataType": [
                "text"
            ],
            "indexFilterable": true,
            "indexSearchable": true,
            "indexRangeFilters": false,
            "tokenization": "field"
        },

according to the docs (and the chatbot) the statement looks like this:

filters.Where().WithPath([]string{"parentProductId"}).WithOperator(filters.Equal).WithValueBoolean(true)

causing this error:
invalid 'where' filter: data type filter cannot use \"valueBoolean\" on type \"text\", use \"valueText\" instead

I have no idea how-to filter for null values, any help is highly appreciated

weaviate: 1.32.2

cheers,

[mbretter]

I have found a workaround until this bug has been fixed:
set:
IndexPropertyLength: true,

and filter with:

filters.Where().WithPath([]string{"len(parentProductId)"}).WithOperator(filters.Equal).WithValueInt(0)