Use type aliasing to forward types from internal/jet.

postgres/types.go

@@ -3,17 +3,7 @@ package postgres
 import "github.com/go-jet/jet/internal/jet"
 
 // Statement is common interface for all statements(SELECT, INSERT, UPDATE, DELETE, LOCK)
-type Statement jet.Statement
+type Statement = jet.Statement
 
 // Projection is interface for all projection types. Types that can be part of, for instance SELECT clause.
-type Projection jet.Projection
-
-func toJetProjectionList(projections []Projection) []jet.Projection {
-	ret := []jet.Projection{}
-
-	for _, projection := range projections {
-		ret = append(ret, projection)
-	}
-
-	return ret
-}
+type Projection = jet.Projection