feat(indexes): Support for index column operator class

src/backend/postgres/index.rs

@@ -162,6 +162,9 @@ impl IndexBuilder for PostgresQueryBuilder {
                     }
                 }
             }
+            if let Some(operator_class) = col.operator_class() {
+                write!(sql, " {}", operator_class.to_string()).unwrap();
+            }
             false
         });
         write!(sql, ")").unwrap();

src/index/common.rs

@@ -20,12 +20,14 @@ pub struct IndexColumnTableColumn {
     pub(crate) name: DynIden,
     pub(crate) prefix: Option<u32>,
     pub(crate) order: Option<IndexOrder>,
+    pub(crate) operator_class: Option<DynIden>,
 }
 
 #[derive(Debug, Clone)]
 pub struct IndexColumnExpr {
     pub(crate) expr: Expr,
     pub(crate) order: Option<IndexOrder>,
+    pub(crate) operator_class: Option<DynIden>,
 }
 
 impl IndexColumn {
@@ -35,6 +37,26 @@ impl IndexColumn {
             IndexColumn::Expr(_) => None,
         }
     }
+
+    pub(crate) fn operator_class(&self) -> &Option<DynIden> {
+        match self {
+            IndexColumn::TableColumn(IndexColumnTableColumn { operator_class, .. }) => operator_class,
+            IndexColumn::Expr(IndexColumnExpr { operator_class, .. }) => operator_class,
+        }
+    }
+
+    /// Set index operator class. Only available on Postgres.
+    pub fn with_operator_class<I: IntoIden>(mut self, operator_class: I) -> Self {
+        match self {
+            IndexColumn::TableColumn(ref mut index_column_table_column) => {
+                index_column_table_column.operator_class = Some(operator_class.into_iden());
+            },
+            IndexColumn::Expr(ref mut index_column_expr) => {
+                index_column_expr.operator_class = Some(operator_class.into_iden())
+            },
+        };
+        self
+    }
 }
 
 #[derive(Debug, Clone)]
@@ -63,6 +85,7 @@ where
             name: self.into_iden(),
             prefix: None,
             order: None,
+            operator_class: None,
         })
     }
 }
@@ -76,6 +99,7 @@ where
             name: self.0.into_iden(),
             prefix: Some(self.1),
             order: None,
+            operator_class: None,
         })
     }
 }
@@ -89,6 +113,7 @@ where
             name: self.0.into_iden(),
             prefix: None,
             order: Some(self.1),
+            operator_class: None,
         })
     }
 }
@@ -102,6 +127,7 @@ where
             name: self.0.into_iden(),
             prefix: Some(self.1),
             order: Some(self.2),
+            operator_class: None,
         })
     }
 }
@@ -111,6 +137,7 @@ impl IntoIndexColumn for FunctionCall {
         IndexColumn::Expr(IndexColumnExpr {
             expr: self.into(),
             order: None,
+            operator_class: None,
         })
     }
 }
@@ -120,6 +147,7 @@ impl IntoIndexColumn for (FunctionCall, IndexOrder) {
         IndexColumn::Expr(IndexColumnExpr {
             expr: self.0.into(),
             order: Some(self.1),
+            operator_class: None,
         })
     }
 }
@@ -129,6 +157,7 @@ impl IntoIndexColumn for Expr {
         IndexColumn::Expr(IndexColumnExpr {
             expr: self,
             order: None,
+            operator_class: None,
         })
     }
 }
@@ -138,6 +167,7 @@ impl IntoIndexColumn for (Expr, IndexOrder) {
         IndexColumn::Expr(IndexColumnExpr {
             expr: self.0,
             order: Some(self.1),
+            operator_class: None,
         })
     }
 }

tests/postgres/index.rs

@@ -70,6 +70,19 @@ fn create_5() {
 
 #[test]
 fn create_6() {
+    assert_eq!(
+        Index::create()
+            .if_not_exists()
+            .name("idx-glyph-image")
+            .table(Glyph::Table)
+            .col(Glyph::Image.into_index_column().with_operator_class("text_pattern_ops"))
+            .to_string(PostgresQueryBuilder),
+        r#"CREATE INDEX IF NOT EXISTS "idx-glyph-image" ON "glyph" ("image" text_pattern_ops)"#
+    );
+}
+
+#[test]
+fn create_7() {
     assert_eq!(
         Index::create()
             .unique()
@@ -84,7 +97,7 @@ fn create_6() {
 }
 
 #[test]
-fn create_7() {
+fn create_8() {
     assert_eq!(
         Index::create()
             .unique()
@@ -99,7 +112,7 @@ fn create_7() {
 }
 
 #[test]
-fn create_8() {
+fn create_9() {
     assert_eq!(
         Index::create()
             .name("idx-font-name-include-id-language")
@@ -115,7 +128,7 @@ fn create_8() {
 }
 
 #[test]
-fn create_9() {
+fn create_10() {
     assert_eq!(
         Index::create()
             .name("idx-character-area")
@@ -127,7 +140,7 @@ fn create_9() {
 }
 
 #[test]
-fn create_10() {
+fn create_11() {
     assert_eq!(
         Index::create()
             .name("idx-character-character-area-desc-created_at")