Merge from develop for CDM v5.5 release - #807
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closes #726
Permit a single row with NULL vocabulary_id to store version information for the vocabulary itself. To preserve foreign keys, replace the primary key constraint on vocabulary.vocabulary_id with a UNIQUE constraint. Rows with NULL vocabulary_id cannot be referenced by foreign keys, since NULL in a foreign key indicates the absence of a parent row. This is not a problem because the version row is not intended to be referenced. NULL handling in UNIQUE constraints differs across DBMS implementations: some allow only one NULL value, while others allow multiple. Since this table will contain only one NULL row, these differences do not affect the intended behavior. Tested only on limited set of dialects: - Postgres - Spark (using Databricks) - Redshift
Support "version row" in vocabulary table
CDM55 changes docs and migration query
Proofread for v5.5 release
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