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feat: datacatalog
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# Data Controller for SAS: Data Catalog
Data Controller collects information about the size and shape of the tables and columns. The Catalog does not contain information about the data content (values).
Data Controller collects information about the size and shape of libraries, tables, columns catalogs, and objects. The Catalog does not contain information about the data content (values).
The catalog is based primarily on the existing SAS dictionary tables, augmented with attributes such as primary key fields, filesize / libsize, and number of observations (eg for database tables).
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Variable attributes come from dictionary tables with an extra PK indicator. A PK is identified by the fact the variable is within an index that is both UNIQUE and NOTNULL. Variable names are always uppercase.
### Catalogs & Objects
This info comes from the dictionary.catalogs table. The catalog created / modified time is considered to be the earliest created time / latest modified time of the underlying objects.
## Assumptions
The following assumptions are made: