hsyuan commented on a change in pull request #1486: [WIP][CALCITE-3388]
StackOverflowError for creating structured RelDataType from class type
URL: https://github.com/apache/calcite/pull/1486#discussion_r331729828
##########
File path: core/src/main/java/org/apache/calcite/jdbc/JavaTypeFactoryImpl.java
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@@ -69,17 +69,33 @@ public JavaTypeFactoryImpl(RelDataTypeSystem typeSystem) {
super(typeSystem);
}
+ /**
+ * Create a structured {@link RelDataType} from java type,
+ * throw exception if recursion founded.
+ */
public RelDataType createStructType(Class type) {
+ Map<Type, Type> edges = new HashMap<>();
+ return createStructType(type, edges);
+ }
+
+ private RelDataType createStructType(Class type, Map<Type, Type> edges) {
+ Type checkType = edges.get(type);
+ while (checkType != null) {
+ if (checkType.equals(type)) {
+ throw new RuntimeException("Recursion for creating struct type
unsupported");
+ }
+ checkType = edges.get(checkType);
+ }
final List<RelDataTypeField> list = new ArrayList<>();
for (Field field : type.getFields()) {
if (!Modifier.isStatic(field.getModifiers())) {
- // FIXME: watch out for recursion
Review comment:
Haha, :)
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