Columns are not resources in and of themselves. Instead, they are child properties of another resource type. They can define sub-properties that are similar to properties defined at the resource level:
Because columns are not resources, their
meta properties are not true configurations. They do not inherit the
meta values of their parent resources. However, you can select a generic test, defined on a column, using tags applied to its column or top-level resource; see test selection examples.
Columns may optionally define a
data_type. This is for metadata purposes only, such as to use alongside the
external property of sources.