Fix most type-defs for #[auto_type] by cleaning up all the type defs

CHANGELOG.md

@@ -25,6 +25,7 @@ Increasing the minimal supported Rust version will always be coupled at least wi
 ### Changed
 
 * The minimal officially supported rustc version is now 1.70.0
+* Deprecated `sql_function!` in favour of `define_sql_function!` which provides compatibility with `#[dsl::auto_type]`
 
 ## [2.1.0] 2023-05-26
 

diesel/src/expression/count.rs

@@ -1,6 +1,6 @@
 use std::marker::PhantomData;
 
-use super::functions::sql_function;
+use super::functions::define_sql_function;
 use super::{is_aggregate, AsExpression};
 use super::{Expression, ValidGrouping};
 use crate::backend::Backend;
@@ -9,7 +9,7 @@ use crate::result::QueryResult;
 use crate::sql_types::{BigInt, DieselNumericOps, SingleValue, SqlType};
 use crate::{AppearsOnTable, SelectableExpression};
 
-sql_function! {
+define_sql_function! {
     /// Creates a SQL `COUNT` expression
     ///
     /// As with most bare functions, this is not exported by default. You can import

diesel/src/expression/exists.rs

@@ -4,7 +4,7 @@
 use crate::backend::{sql_dialect, Backend, SqlDialect};
 use crate::expression::subselect::Subselect;
 use crate::expression::{AppearsOnTable, Expression, SelectableExpression, ValidGrouping};
-use crate::helper_types::exists;
+use crate::helper_types;
 use crate::query_builder::*;
 use crate::result::QueryResult;
 use crate::sql_types::Bool;
@@ -32,7 +32,7 @@ use crate::sql_types::Bool;
 /// assert_eq!(Ok(false), jim_exists);
 /// # }
 /// ```
-pub fn exists<T>(query: T) -> exists<T> {
+pub fn exists<T>(query: T) -> helper_types::exists<T> {
     Exists {
         subselect: Subselect::new(query),
     }

diesel/src/expression/functions/aggregate_folding.rs

@@ -1,7 +1,7 @@
-use crate::expression::functions::sql_function;
+use crate::expression::functions::define_sql_function;
 use crate::sql_types::Foldable;
 
-sql_function! {
+define_sql_function! {
     /// Represents a SQL `SUM` function. This function can only take types which are
     /// Foldable.
     ///
@@ -21,7 +21,7 @@ sql_function! {
     fn sum<ST: Foldable>(expr: ST) -> ST::Sum;
 }
 
-sql_function! {
+define_sql_function! {
     /// Represents a SQL `AVG` function. This function can only take types which are
     /// Foldable.
     ///

diesel/src/expression/functions/aggregate_ordering.rs

@@ -1,7 +1,7 @@
 use self::private::SqlOrdAggregate;
-use crate::expression::functions::sql_function;
+use crate::expression::functions::define_sql_function;
 
-sql_function! {
+define_sql_function! {
     /// Represents a SQL `MAX` function. This function can only take types which are
     /// ordered.
     ///
@@ -20,7 +20,7 @@ sql_function! {
     fn max<ST: SqlOrdAggregate>(expr: ST) -> ST::Ret;
 }
 
-sql_function! {
+define_sql_function! {
     /// Represents a SQL `MIN` function. This function can only take types which are
     /// ordered.
     ///

diesel/src/expression/functions/date_and_time.rs

@@ -1,6 +1,6 @@
 use crate::backend::Backend;
 use crate::expression::coerce::Coerce;
-use crate::expression::functions::sql_function;
+use crate::expression::functions::define_sql_function;
 use crate::expression::{AsExpression, Expression, ValidGrouping};
 use crate::query_builder::*;
 use crate::result::QueryResult;
@@ -27,7 +27,7 @@ impl_selectable_expression!(now);
 
 operator_allowed!(now, Add, add);
 operator_allowed!(now, Sub, sub);
-sql_function! {
+define_sql_function! {
     /// Represents the SQL `DATE` function. The argument should be a Timestamp
     /// expression, and the return value will be an expression of type Date.
     ///

diesel/src/expression/functions/helper_types.rs

@@ -8,16 +8,16 @@ use crate::expression::operators;
 pub type not<Expr> = operators::Not<Grouped<Expr>>;
 
 /// The return type of [`max(expr)`](crate::dsl::max())
-pub type max<Expr> = super::aggregate_ordering::max::HelperType<SqlTypeOf<Expr>, Expr>;
+pub type max<Expr> = super::aggregate_ordering::max<SqlTypeOf<Expr>, Expr>;
 
 /// The return type of [`min(expr)`](crate::dsl::min())
-pub type min<Expr> = super::aggregate_ordering::min::HelperType<SqlTypeOf<Expr>, Expr>;
+pub type min<Expr> = super::aggregate_ordering::min<SqlTypeOf<Expr>, Expr>;
 
 /// The return type of [`sum(expr)`](crate::dsl::sum())
-pub type sum<Expr> = super::aggregate_folding::sum::HelperType<SqlTypeOf<Expr>, Expr>;
+pub type sum<Expr> = super::aggregate_folding::sum<SqlTypeOf<Expr>, Expr>;
 
 /// The return type of [`avg(expr)`](crate::dsl::avg())
-pub type avg<Expr> = super::aggregate_folding::avg::HelperType<SqlTypeOf<Expr>, Expr>;
+pub type avg<Expr> = super::aggregate_folding::avg<SqlTypeOf<Expr>, Expr>;
 
 /// The return type of [`exists(expr)`](crate::dsl::exists())
 pub type exists<Expr> = crate::expression::exists::Exists<Expr>;

diesel/src/expression/functions/mod.rs

@@ -1,6 +1,10 @@
 //! Helper macros to define custom sql functions
 
 #[doc(inline)]
+pub use diesel_derives::define_sql_function;
+
+#[doc(inline)]
+#[cfg(all(feature = "with-deprecated", not(feature = "without-deprecated")))]
 pub use diesel_derives::sql_function_proc as sql_function;
 
 #[macro_export]
@@ -73,7 +77,7 @@ macro_rules! no_arg_sql_function_body {
 /// function.
 #[deprecated(
     since = "2.0.0",
-    note = "Use `sql_function!` instead. See `CHANGELOG.md` for migration instructions"
+    note = "Use `define_sql_function!` instead. See `CHANGELOG.md` for migration instructions"
 )]
 #[cfg(all(feature = "with-deprecated", not(feature = "without-deprecated")))]
 macro_rules! no_arg_sql_function {

diesel/src/expression/helper_types.rs

@@ -26,6 +26,9 @@ pub type Eq<Lhs, Rhs> = Grouped<super::operators::Eq<Lhs, AsExpr<Rhs, Lhs>>>;
 /// [`lhs.ne(rhs)`](crate::expression_methods::ExpressionMethods::ne())
 pub type NotEq<Lhs, Rhs> = Grouped<super::operators::NotEq<Lhs, AsExpr<Rhs, Lhs>>>;
 
+#[doc(hidden)] // required for `#[auto_type]`
+pub type Ne<Lhs, Rhs> = NotEq<Lhs, Rhs>;
+
 /// The return type of
 /// [`lhs.eq_any(rhs)`](crate::expression_methods::ExpressionMethods::eq_any())
 pub type EqAny<Lhs, Rhs> = Grouped<In<Lhs, <Rhs as AsInExpression<SqlTypeOf<Lhs>>>::InExpression>>;
@@ -35,6 +38,9 @@ pub type EqAny<Lhs, Rhs> = Grouped<In<Lhs, <Rhs as AsInExpression<SqlTypeOf<Lhs>
 pub type NeAny<Lhs, Rhs> =
     Grouped<NotIn<Lhs, <Rhs as AsInExpression<SqlTypeOf<Lhs>>>::InExpression>>;
 
+#[doc(hidden)] // required for `#[auto_type]`
+pub type NeAll<Lhs, Rhs> = NeAny<Lhs, Rhs>;
+
 /// The return type of
 /// [`expr.is_null()`](crate::expression_methods::ExpressionMethods::is_null())
 pub type IsNull<Expr> = Grouped<super::operators::IsNull<Expr>>;
@@ -51,6 +57,9 @@ pub type Gt<Lhs, Rhs> = Grouped<super::operators::Gt<Lhs, AsExpr<Rhs, Lhs>>>;
 /// [`lhs.ge(rhs)`](crate::expression_methods::ExpressionMethods::ge())
 pub type GtEq<Lhs, Rhs> = Grouped<super::operators::GtEq<Lhs, AsExpr<Rhs, Lhs>>>;
 
+#[doc(hidden)] // required for `#[auto_type]`
+pub type Ge<Lhs, Rhs> = GtEq<Lhs, Rhs>;
+
 /// The return type of
 /// [`lhs.lt(rhs)`](crate::expression_methods::ExpressionMethods::lt())
 pub type Lt<Lhs, Rhs> = Grouped<super::operators::Lt<Lhs, AsExpr<Rhs, Lhs>>>;
@@ -59,6 +68,9 @@ pub type Lt<Lhs, Rhs> = Grouped<super::operators::Lt<Lhs, AsExpr<Rhs, Lhs>>>;
 /// [`lhs.le(rhs)`](crate::expression_methods::ExpressionMethods::le())
 pub type LtEq<Lhs, Rhs> = Grouped<super::operators::LtEq<Lhs, AsExpr<Rhs, Lhs>>>;
 
+#[doc(hidden)] // required for `#[auto_type]`
+pub type Le<Lhs, Rhs> = LtEq<Lhs, Rhs>;
+
 /// The return type of
 /// [`lhs.between(lower, upper)`](crate::expression_methods::ExpressionMethods::between())
 pub type Between<Lhs, Lower, Upper> = Grouped<
@@ -122,12 +134,12 @@ pub type Like<Lhs, Rhs> = Grouped<super::operators::Like<Lhs, AsExprOf<Rhs, SqlT
 pub type NotLike<Lhs, Rhs> = Grouped<super::operators::NotLike<Lhs, AsExprOf<Rhs, SqlTypeOf<Lhs>>>>;
 
 /// The return type of [`case_when()`](expression::case_when::case_when)
-#[allow(non_camel_case_types)]
+#[allow(non_camel_case_types)] // required for `#[auto_type]`
 pub type case_when<C, T, ST = <T as Expression>::SqlType> = expression::case_when::CaseWhen<
     expression::case_when::CaseWhenConditionsLeaf<Grouped<C>, Grouped<AsExprOf<T, ST>>>,
     expression::case_when::NoElseExpression,
 >;
-/// The return type of [`case_when(...).when(...)`](expression::case_when::CaseWhen::when)
+/// The return type of [`case_when(...).when(...)`](expression::CaseWhen::when)
 pub type When<W, C, T> = expression::case_when::CaseWhen<
     expression::case_when::CaseWhenConditionsIntermediateNode<
         Grouped<C>,

diesel/src/expression/mod.rs

@@ -53,7 +53,7 @@ pub(crate) mod dsl {
     use crate::dsl::SqlTypeOf;
 
     #[doc(inline)]
-    pub use super::case_when::*;
+    pub use super::case_when::case_when;
     #[doc(inline)]
     pub use super::count::*;
     #[doc(inline)]
@@ -65,6 +65,8 @@ pub(crate) mod dsl {
     #[doc(inline)]
     pub use super::functions::date_and_time::*;
     #[doc(inline)]
+    pub use super::helper_types::{case_when, Otherwise, When};
+    #[doc(inline)]
     pub use super::not::not;
     #[doc(inline)]
     pub use super::sql_literal::sql;
@@ -73,7 +75,7 @@ pub(crate) mod dsl {
     pub use crate::pg::expression::dsl::*;
 
     /// The return type of [`count(expr)`](crate::dsl::count())
-    pub type count<Expr> = super::count::count::HelperType<SqlTypeOf<Expr>, Expr>;
+    pub type count<Expr> = super::count::count<SqlTypeOf<Expr>, Expr>;
 
     /// The return type of [`count_star()`](crate::dsl::count_star())
     pub type count_star = super::count::CountStar;
@@ -82,12 +84,14 @@ pub(crate) mod dsl {
     pub type count_distinct<Expr> = super::count::CountDistinct<SqlTypeOf<Expr>, Expr>;
 
     /// The return type of [`date(expr)`](crate::dsl::date())
-    pub type date<Expr> = super::functions::date_and_time::date::HelperType<Expr>;
+    pub type date<Expr> = super::functions::date_and_time::date<Expr>;
 
     #[cfg(feature = "mysql_backend")]
     pub use crate::mysql::query_builder::DuplicatedKeys;
 }
 
+#[doc(inline)]
+pub use self::case_when::CaseWhen;
 #[doc(inline)]
 pub use self::sql_literal::{SqlLiteral, UncheckedBind};
 

diesel/src/expression/not.rs

@@ -1,6 +1,6 @@
 use crate::expression::grouped::Grouped;
 use crate::expression::Expression;
-use crate::helper_types::not;
+use crate::helper_types;
 use crate::sql_types::BoolOrNullableBool;
 
 /// Creates a SQL `NOT` expression
@@ -23,7 +23,7 @@ use crate::sql_types::BoolOrNullableBool;
 /// assert_eq!(Ok(2), users_not_with_name.first(connection));
 /// # }
 /// ```
-pub fn not<T>(expr: T) -> not<T>
+pub fn not<T>(expr: T) -> helper_types::not<T>
 where
     T: Expression,
     <T as Expression>::SqlType: BoolOrNullableBool,

diesel/src/expression/operators.rs

@@ -529,7 +529,6 @@ infix_operator!(Escape, " ESCAPE ");
 infix_operator!(Eq, " = ");
 infix_operator!(Gt, " > ");
 infix_operator!(GtEq, " >= ");
-infix_operator!(Like, " LIKE ");
 infix_operator!(Lt, " < ");
 infix_operator!(LtEq, " <= ");
 infix_operator!(NotEq, " != ");
@@ -645,3 +644,106 @@ where
         Ok(())
     }
 }
+
+// need an explicit impl here to control which types are allowed
+#[derive(
+    Debug,
+    Clone,
+    Copy,
+    crate::query_builder::QueryId,
+    crate::sql_types::DieselNumericOps,
+    crate::expression::ValidGrouping,
+)]
+#[doc(hidden)]
+pub struct Like<T, U> {
+    pub(crate) left: T,
+    pub(crate) right: U,
+}
+
+impl<T, U> Like<T, U> {
+    pub(crate) fn new(left: T, right: U) -> Self {
+        Like { left, right }
+    }
+}
+
+impl<T, U, QS> crate::expression::SelectableExpression<QS> for Like<T, U>
+where
+    Like<T, U>: crate::expression::AppearsOnTable<QS>,
+    T: crate::expression::SelectableExpression<QS>,
+    U: crate::expression::SelectableExpression<QS>,
+{
+}
+
+impl<T, U, QS> crate::expression::AppearsOnTable<QS> for Like<T, U>
+where
+    Like<T, U>: crate::expression::Expression,
+    T: crate::expression::AppearsOnTable<QS>,
+    U: crate::expression::AppearsOnTable<QS>,
+{
+}
+
+impl<T, U> crate::expression::Expression for Like<T, U>
+where
+    T: crate::expression::Expression,
+    U: crate::expression::Expression,
+    <T as crate::expression::Expression>::SqlType: crate::sql_types::SqlType,
+    <U as crate::expression::Expression>::SqlType: crate::sql_types::SqlType,
+    crate::sql_types::is_nullable::IsSqlTypeNullable<<T as crate::expression::Expression>::SqlType>:
+        crate::sql_types::OneIsNullable<
+            crate::sql_types::is_nullable::IsSqlTypeNullable<
+                <U as crate::expression::Expression>::SqlType,
+            >,
+        >,
+    crate::sql_types::is_nullable::IsOneNullable<
+        <T as crate::expression::Expression>::SqlType,
+        <U as crate::expression::Expression>::SqlType,
+    >: crate::sql_types::MaybeNullableType<crate::sql_types::Bool>,
+{
+    type SqlType = crate::sql_types::is_nullable::MaybeNullable<
+        crate::sql_types::is_nullable::IsOneNullable<
+            <T as crate::expression::Expression>::SqlType,
+            <U as crate::expression::Expression>::SqlType,
+        >,
+        crate::sql_types::Bool,
+    >;
+}
+
+impl<T, U, DB> crate::query_builder::QueryFragment<DB> for Like<T, U>
+where
+    T: crate::query_builder::QueryFragment<DB> + crate::Expression,
+    U: crate::query_builder::QueryFragment<DB>,
+    DB: crate::backend::Backend,
+    DB: LikeIsAllowedForType<T::SqlType>,
+{
+    fn walk_ast<'b>(
+        &'b self,
+        mut out: crate::query_builder::AstPass<'_, 'b, DB>,
+    ) -> crate::result::QueryResult<()> {
+        (self.left.walk_ast(out.reborrow())?);
+        (out.push_sql(" LIKE "));
+        (self.right.walk_ast(out.reborrow())?);
+        Ok(())
+    }
+}
+
+impl<S, T, U> crate::internal::operators_macro::FieldAliasMapper<S> for Like<T, U>
+where
+    S: crate::query_source::AliasSource,
+    T: crate::internal::operators_macro::FieldAliasMapper<S>,
+    U: crate::internal::operators_macro::FieldAliasMapper<S>,
+{
+    type Out = Like<
+        <T as crate::internal::operators_macro::FieldAliasMapper<S>>::Out,
+        <U as crate::internal::operators_macro::FieldAliasMapper<S>>::Out,
+    >;
+    fn map(self, alias: &crate::query_source::Alias<S>) -> Self::Out {
+        Like {
+            left: self.left.map(alias),
+            right: self.right.map(alias),
+        }
+    }
+}
+
+pub trait LikeIsAllowedForType<ST>: Backend {}
+
+impl<DB> LikeIsAllowedForType<crate::sql_types::Text> for DB where DB: Backend {}