type There are 2 types of relation between source and target column. a) Direct dataflow: represented by the
fdd in the JSON output. b) In-direct dataflow: represented by the
fdr in the JSON output. In-direct dataflow also known as
impact type, which means the value of the source column doesn't affect the value of the target column, but effect the rows number of the target column. For instance, the relation between a source column in the where clause and the column in the select list is a In-direct relation(impact).