Minor improvements

Author: weiznich

diesel/src/pg/expression/operators.rs

@@ -2,7 +2,8 @@ use crate::backend::{Backend, DieselReserveSpecialization};
 use crate::expression::expression_types::NotSelectable;
 use crate::expression::{TypedExpressionType, ValidGrouping};
 use crate::pg::Pg;
-use crate::query_builder::{AssignmentTarget, AstPass, QueryFragment, QueryId};
+use crate::query_builder::update_statement::changeset::AssignmentTarget;
+use crate::query_builder::{AstPass, QueryFragment, QueryId};
 use crate::sql_types::{
     Array, Bigint, Bool, DieselNumericOps, Inet, Integer, Jsonb, SqlType, Text,
 };

diesel/src/query_builder/mod.rs

@@ -30,7 +30,7 @@ mod returning_clause;
 pub(crate) mod select_clause;
 pub(crate) mod select_statement;
 mod sql_query;
-mod update_statement;
+pub(crate) mod update_statement;
 pub(crate) mod upsert;
 mod where_clause;
 
@@ -55,7 +55,7 @@ pub use self::sql_query::{BoxedSqlQuery, SqlQuery};
 pub use self::upsert::on_conflict_target_decorations::DecoratableTarget;
 
 #[doc(inline)]
-pub use self::update_statement::changeset::{AsChangeset, AssignmentTarget};
+pub use self::update_statement::changeset::AsChangeset;
 #[doc(inline)]
 pub use self::update_statement::target::{IntoUpdateTarget, UpdateTarget};
 #[doc(inline)]

diesel/src/query_builder/update_statement/changeset.rs

@@ -129,16 +129,3 @@ where
         ColumnWrapperForUpdate(self)
     }
 }
-
-#[derive(Debug, Clone, Copy)]
-pub(crate) struct ExpressionWrapperForUpdate<C>(C);
-
-impl<DB, Expr> QueryFragment<DB> for ExpressionWrapperForUpdate<Expr>
-where
-    DB: Backend + DieselReserveSpecialization,
-    Expr: QueryFragment<DB>,
-{
-    fn walk_ast<'b>(&'b self, mut out: AstPass<'_, 'b, DB>) -> QueryResult<()> {
-        QueryFragment::walk_ast(&self.0, out.reborrow())
-    }
-}

diesel/src/query_builder/update_statement/mod.rs

@@ -1,4 +1,4 @@
-pub(super) mod changeset;
+pub(crate) mod changeset;
 pub(super) mod target;
 
 use self::target::UpdateTarget;