Which tool is most conservative when changing data types automatically?

The Auto Field Tool is designed to optimize and adjust data types automatically based on the data being processed. The term "most conservative" in this context refers to how the tool handles data types: it tends to choose the safest, most appropriate data type that will not lose information or alter the data more than necessary. This means that while it may convert fields to more efficient types (such as from String to Integer), it will not convert a field to a type that might result in data loss or inaccuracies, such as from Integer to String when the data does not require it.

In contrast, the Select Tool allows users to explicitly choose data types and can be more flexible but also allows for possible mistakes if the user does not know the best type to select. The Data Cleansing Tool focuses on cleaning and preparing data, potentially altering data types without the same conservativeness as the Auto Field Tool. The Input Data Tool is primarily for bringing data into Alteryx from various sources and does not automatically modify data types in a conservative manner; it relies on the file structure and user-definitions.

Therefore, the Auto Field Tool stands out for its careful and conservative approach to managing data types automatically, ensuring that data integrity is maintained wherever possible.