Descriptor was primarily used for the legacy connector stack and have been
TableDescriptor for creating sources and sinks from the Table API.
@PublicEvolving @Deprecated public interface Descriptor
Typical characteristics of a descriptor are: - descriptors have a default constructor - descriptors themselves contain very little logic - corresponding validators validate the correctness (goal: have a single point of validation)
A descriptor is similar to a builder in a builder pattern, thus, mutable for building properties.
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