How many rows will be output from the Append Fields tool if set to allow all appends given two input sizes of 18 and 885?

The Append Fields tool in Alteryx is designed to combine fields from two different datasets based on a one-to-many relationship. When it allows for all possible appends, it effectively multiplies the number of rows from the first input by the number of rows from the second input. In this case, with one dataset containing 18 rows and the other containing 885 rows, the output will be the result of multiplying these two numbers together.

When you apply the tool with those input sizes, it calculates the total number of rows in the output as follows: 18 (from the first dataset) multiplied by 885 (from the second dataset), which equals 15,930. This total represents every combination of rows from both datasets, as each row in the first dataset will pair with each row in the second dataset, leading to this significant increase in the number of resulting rows.

In summary, the output of the Append Fields tool when set to allow all appends in this scenario will yield 15,930 rows, as each row from the smaller dataset is paired with every row from the larger dataset, thus creating a Cartesian product of the two sets.