How to Fill Sparse Data With the Previous Non-Empty Value in SPARQL Dataset

Dear All, I am trying to propagate the last valid observation (e.g. not null) to the null values in a dataset. Below I reported the partial solution: Dataset tmp800=tmp700.select("uuid", "eventTime", "Washer_rinseCycles"); WindowSpec wspec=

How to Fill Sparse Data With the Previous Non-Empty Value in SPARQL Dataset

Dear All, I need to apply a dataset transformation to replace null values with the previous Non-null Value. As an example, I report the following: from: id | col1 - 1 null 1 null 2 4 2 null 2 null 3 5 3 null 3 null to: id | col1 - 1 null 1 null 2 4 2