Mark boolean expression classes as frozen for immutability

Author: kosiew

src/expr/bool_expr.rs

@@ -51,7 +51,7 @@ impl PyNot {
     }
 }
 
-#[pyclass(name = "IsNotNull", module = "datafusion.expr", subclass)]
+#[pyclass(frozen, name = "IsNotNull", module = "datafusion.expr", subclass)]
 #[derive(Clone, Debug)]
 pub struct PyIsNotNull {
     expr: Expr,
@@ -81,7 +81,7 @@ impl PyIsNotNull {
     }
 }
 
-#[pyclass(name = "IsNull", module = "datafusion.expr", subclass)]
+#[pyclass(frozen, name = "IsNull", module = "datafusion.expr", subclass)]
 #[derive(Clone, Debug)]
 pub struct PyIsNull {
     expr: Expr,
@@ -111,7 +111,7 @@ impl PyIsNull {
     }
 }
 
-#[pyclass(name = "IsTrue", module = "datafusion.expr", subclass)]
+#[pyclass(frozen, name = "IsTrue", module = "datafusion.expr", subclass)]
 #[derive(Clone, Debug)]
 pub struct PyIsTrue {
     expr: Expr,
@@ -141,7 +141,7 @@ impl PyIsTrue {
     }
 }
 
-#[pyclass(name = "IsFalse", module = "datafusion.expr", subclass)]
+#[pyclass(frozen, name = "IsFalse", module = "datafusion.expr", subclass)]
 #[derive(Clone, Debug)]
 pub struct PyIsFalse {
     expr: Expr,
@@ -171,7 +171,7 @@ impl PyIsFalse {
     }
 }
 
-#[pyclass(name = "IsUnknown", module = "datafusion.expr", subclass)]
+#[pyclass(frozen, name = "IsUnknown", module = "datafusion.expr", subclass)]
 #[derive(Clone, Debug)]
 pub struct PyIsUnknown {
     expr: Expr,
@@ -201,7 +201,7 @@ impl PyIsUnknown {
     }
 }
 
-#[pyclass(name = "IsNotTrue", module = "datafusion.expr", subclass)]
+#[pyclass(frozen, name = "IsNotTrue", module = "datafusion.expr", subclass)]
 #[derive(Clone, Debug)]
 pub struct PyIsNotTrue {
     expr: Expr,
@@ -231,7 +231,7 @@ impl PyIsNotTrue {
     }
 }
 
-#[pyclass(name = "IsNotFalse", module = "datafusion.expr", subclass)]
+#[pyclass(frozen, name = "IsNotFalse", module = "datafusion.expr", subclass)]
 #[derive(Clone, Debug)]
 pub struct PyIsNotFalse {
     expr: Expr,
@@ -261,7 +261,7 @@ impl PyIsNotFalse {
     }
 }
 
-#[pyclass(name = "IsNotUnknown", module = "datafusion.expr", subclass)]
+#[pyclass(frozen, name = "IsNotUnknown", module = "datafusion.expr", subclass)]
 #[derive(Clone, Debug)]
 pub struct PyIsNotUnknown {
     expr: Expr,
@@ -291,7 +291,7 @@ impl PyIsNotUnknown {
     }
 }
 
-#[pyclass(name = "Negative", module = "datafusion.expr", subclass)]
+#[pyclass(frozen, name = "Negative", module = "datafusion.expr", subclass)]
 #[derive(Clone, Debug)]
 pub struct PyNegative {
     expr: Expr,