Enable new features by default

Author: xitep

src/dialect/generic.rs

@@ -195,20 +195,4 @@ impl Dialect for GenericDialect {
     fn supports_interval_options(&self) -> bool {
         true
     }
-
-    fn supports_merge_insert_qualified_columns(&self) -> bool {
-        true
-    }
-
-    fn supports_merge_insert_predicate(&self) -> bool {
-        true
-    }
-
-    fn supports_merge_update_predicate(&self) -> bool {
-        true
-    }
-
-    fn supports_merge_update_delete_predicate(&self) -> bool {
-        true
-    }
 }

src/dialect/mod.rs

@@ -641,6 +641,7 @@ pub trait Dialect: Debug + Any {
     ///      -- here: qualified with array subscripts
     ///      INSERT (FOO.ID[1], FOO.NAME[1:12])
     ///      VALUES (FOO_IMP.ID, UPPER(FOO_IMP.NAME))
+    /// ```
     /// or
     /// ```sql
     /// MERGE INTO FOO X
@@ -652,10 +653,9 @@ pub trait Dialect: Debug + Any {
     ///      VALUES (FOO_IMP.ID, UPPER(FOO_IMP.NAME))
     /// ```
     ///
-    /// The default implementation always returns `false` not allowing the
-    /// qualifiers.
+    /// By default, qualifiers are allowed.
     fn supports_merge_insert_qualified_columns(&self) -> bool {
-        false
+        true
     }
 
     /// Returns `true` if the dialect supports specify an INSERT predicate in
@@ -672,13 +672,12 @@ pub trait Dialect: Debug + Any {
     ///       WHERE NOT FOO_IMP.NAME like '%.IGNORE'
     /// ```
     ///
-    /// The default implementation always returns `false` indicating no
-    /// support for the additional predicate.
+    /// By default, the additional predicate support is enabled.
     ///
     /// See also [Dialect::supports_merge_update_predicate] and
     /// [Dialect::supports_merge_update_delete_predicate].
     fn supports_merge_insert_predicate(&self) -> bool {
-        false
+        true
     }
 
     /// Indicates the supports of UPDATE predicates in MERGE
@@ -694,13 +693,12 @@ pub trait Dialect: Debug + Any {
     ///       WHERE FOO.NAME <> 'pete'
     /// ```
     ///
-    /// The default implementation always returns false indicating no support
-    /// for the additional predicate.
+    /// By default, the additional predicate is enabled.
     ///
     /// See also [Dialect::supports_merge_insert_predicate] and
     /// [Dialect::supports_merge_update_delete_predicate].
     fn supports_merge_update_predicate(&self) -> bool {
-        false
+        true
     }
 
     /// Indicates the supports of UPDATE ... DELETEs and associated predicates
@@ -716,13 +714,13 @@ pub trait Dialect: Debug + Any {
     ///      DELETE WHERE UPPER(FOO.NAME) == FOO.NAME
     /// ```
     ///
-    /// The default implementation always returns false indicating no support
-    /// for the `UPDATE ... DELETE` and its associated predicate.
+    /// By default, the support for the `UPDATE ... DELETE` and its associated
+    /// predicate is enabled.
     ///
     /// See also [Dialect::supports_merge_insert_predicate] and
     /// [Dialect::supports_merge_update_predicate].
     fn supports_merge_update_delete_predicate(&self) -> bool {
-        false
+        true
     }
 
     /// Dialect-specific infix parser override

src/dialect/mssql.rs

@@ -123,6 +123,26 @@ impl Dialect for MsSqlDialect {
         true
     }
 
+    /// Set <https://learn.microsoft.com/en-us/sql/t-sql/statements/merge-transact-sql>
+    fn supports_merge_insert_predicate(&self) -> bool {
+        false
+    }
+
+    /// Set <https://learn.microsoft.com/en-us/sql/t-sql/statements/merge-transact-sql>
+    fn supports_merge_insert_qualified_columns(&self) -> bool {
+        false
+    }
+
+    /// Set <https://learn.microsoft.com/en-us/sql/t-sql/statements/merge-transact-sql>
+    fn supports_merge_update_delete_predicate(&self) -> bool {
+        false
+    }
+
+    /// Set <https://learn.microsoft.com/en-us/sql/t-sql/statements/merge-transact-sql>
+    fn supports_merge_update_predicate(&self) -> bool {
+        false
+    }
+
     /// See <https://learn.microsoft.com/en-us/sql/relational-databases/security/authentication-access/server-level-roles>
     fn get_reserved_grantees_types(&self) -> &[GranteesType] {
         &[GranteesType::Public]

src/dialect/postgresql.rs

@@ -281,11 +281,18 @@ impl Dialect for PostgreSqlDialect {
         true
     }
 
-    /// [Postgres] supports column names with a subfield name or an array
-    /// subscript in the MERGE INSERT column lists.
-    ///
-    /// [Postgres]: https://www.postgresql.org/docs/current/sql-merge.html
-    fn supports_merge_insert_qualified_columns(&self) -> bool {
-        true
+    /// See <https://www.postgresql.org/docs/current/sql-merge.html>
+    fn supports_merge_insert_predicate(&self) -> bool {
+        false
+    }
+
+    /// See <https://www.postgresql.org/docs/current/sql-merge.html>
+    fn supports_merge_update_delete_predicate(&self) -> bool {
+        false
+    }
+
+    /// See <https://www.postgresql.org/docs/current/sql-merge.html>
+    fn supports_merge_update_predicate(&self) -> bool {
+        false
     }
 }