What warning does the Append Fields tool generate if too many records are created?

The Append Fields tool in Alteryx is designed to combine different datasets by adding fields from one input to another. When too many records are created during this process, the tool issues a warning to inform the user that the output may exceed manageable limits. This is particularly relevant when the number of appended records surpasses 16, as this is recognized as a threshold where performance issues may arise.

The warning serves a dual purpose: first, it alerts the user to the potential for significant increases in record count that could affect processing speed and performance; second, it is indicative of Alteryx's built-in checks to encourage users to maintain efficiency in their workflows. By generating this warning, the tool guides users toward optimizing their data management practices and mitigating risks related to excessive data handling.

This response encompasses the significance of the warning and the rationale behind both aspects—alerting to the high number of appended records and addressing possible errors associated with that situation.