A merge query takes the results of one or more queries and combines (merges) the results
according to field mapping definitions. The result is similar to a SQL left outer join.
A merge query can merge results of queries from different SQL databases.
The order that queries are defined in the source_queries array property is significant. The
first query in the array defines the primary key into which the results of subsequent
queries will be merged.
Like model/view query objects, merge queries are immutable and have structural identity - if
you make a request to create a new merge query that is identical to an existing merge query,
the existing merge query will be returned instead of creating a duplicate. Conversely, any
change to the contents of a merge query will produce a new object with a new id.
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