public class AlterTableRowTransformer
Used by alter table write interceptors to map rows written in src table to new
This class is driven by its exec row definitions and its encoder/decoder.
These are created for a specific alter table action in TransformingDDLDescriptors
Transform a source KVPair to a target KVPair, where a KVPair represents a
row in a table that's being altered. The table may have been altered by
adding or removing a column, or constraint.
This method is used during the intercept phase of alter table.