Merge relation schemas with empty keys

Merges an object's schemas with empty keys. The remaining such schema contains all attributes contained in such schemas.

Usage

merge_empty_keys(x)

Arguments

x

a relational schema object, such as a relation_schema or database_schema object.

Value

An R object of the same class as x, where relations with an empty key have been merged into a single relation.

Details

This function is not itself generic, but makes use of the generic functions keys and merge_schemas. Any input class with valid methods for these generic functions can be passed into this function.

For database_schema objects, references involving the schemas with empty keys are updated to refer to the merged schema.

See also

merge_schemas, on which this function is based.