sealed trait Opinion[T] extends AnyRef
An Opinion represents a piece of data that needs to be propagated through AST transformations but is not directly
related to how ASTs are transformed in most stages. For instance, Renameable
controls how columns are named (i.e. whether to use a
NamingStrategy
or not) after most of the SQL transformations are done. Some transformations (e.g. RenameProperties
will use Opinions
or even modify them so that the correct kind of query comes out at the end of the normalizations.
That said, Opinions should be transparent in most steps of the normalization. In some cases e.g. BetaReduction
,
AST elements need to be neutralized (i.e. set back to defaults in the entire tree) so that this works correctly.
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