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ea901fdb9d
Our `null` expression, after the prepare stage, is redundant with a `constant` expression containing the value NULL. Remove it. Its role in the unprepared stage is taken over by untyped_constant, which gains a new type_class enumeration to represent it. Some subtleties: - Usually, handling of null and untyped_constant, or null and constant was the same, so they are just folded into each other - LWT "like" operator now has to discriminate between a literal string and a literal NULL - prepare and test_assignment were folded into the corresponing untyped_constant functions. Some care had to be taken to preserve error messages. Closes #12118