[jOOQ/jOOQ#10179] This isn't true for IS [ NOT ] (DOCUMENT | JSON)

jOOQ/src/main/java/org/jooq/impl/IsDocument.java

@@ -61,11 +61,6 @@ final class IsDocument extends AbstractCondition {
         this.isDocument = isDocument;
     }
 
-    @Override
-    final boolean isNullable() {
-        return false;
-    }
-
     @Override
     public final void accept(Context<?> ctx) {
         ctx.visit(field).sql(' ').visit(isDocument ? K_IS_DOCUMENT : K_IS_NOT_DOCUMENT);

jOOQ/src/main/java/org/jooq/impl/IsJSON.java

@@ -65,11 +65,6 @@ final class IsJSON extends AbstractCondition {
         this.isJSON = isJSON;
     }
 
-    @Override
-    final boolean isNullable() {
-        return false;
-    }
-
     @Override
     public final void accept(Context<?> ctx) {
         switch (ctx.family()) {