For example, in such a dialect,
SELECT CONCAT(x) as foo FROM t HAVING CONCAT(x) LIKE "%"
would be illegal, but SELECT CONCAT(x) as foo FROM t HAVING foo LIKE "%"
would be legal. MySQL is an example of such dialects.
@return Whether this Dialect can include expressions in the HAVINGclause only by adding an expression to the SELECT clause and using its alias
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