Column types for expressions

Each constant or function specified in a query is given a name based upon the name returned from the database driver to the database adapter. If the database driver does not return a name for a column in the results, the item type created for the column is given a name beginning with Expr and is concatenated with a number beginning with 1000 for the first constant or function, 1001 for the second, and so on.

For example, the type tree generated for the following query

SELECT MIN(salary), MAX(salary) FROM Employee

would have a Row with two columns representing the result of the SQL MIN and MAX functions. In the type tree, the items created to represent the results of these functions would be Expr1000 and Expr1001 for the MIN and MAX functions, respectively.