Do active transformations in a mapping change the number of rows that pass to the next step?

Active transformations in Informatica mappings do not change the number of rows that pass to the next step, which is a key characteristic of these transformations. Active transformations are capable of altering the flow of data such as filtering, aggregating, or transforming data, but they do not inherently change the overall quantity of rows that are passed through unless certain conditions are imposed, such as filters or rules that limit the data.

For instance, while an active transformation like an Expression transformation can modify the data values of rows, it will not influence the total count of rows flowing through the mapping in the same way that a Filter transformation would, which explicitly removes rows based on conditions applied.

This conceptual understanding is crucial, as it helps in designing mappings effectively and anticipating how data will flow through various transformations without the misconception that active transformations inherently reduce or increase row counts in the output. In this case, the assertion that active transformations do not change the number of rows is fundamentally accurate, supporting the rationale for the selected answer.