noblepaul commented on a change in pull request #1225: SOLR-14233: 
JsonSchemaCreator should support Map payloads
URL: https://github.com/apache/lucene-solr/pull/1225#discussion_r373368699
 
 

 ##########
 File path: 
solr/solrj/src/java/org/apache/solr/common/util/JsonSchemaCreator.java
 ##########
 @@ -57,10 +57,18 @@
   private static Map<String, Object> 
createSchemaFromType(java.lang.reflect.Type t, Map<String, Object> map) {
     if (natives.containsKey(t)) {
       map.put("type", natives.get(t));
-    } else if (t instanceof ParameterizedType && ((ParameterizedType) 
t).getRawType() == List.class) {
-      Type typ = ((ParameterizedType) t).getActualTypeArguments()[0];
-      map.put("type", "array");
-      map.put("items", getSchema(typ));
+    } else if (t instanceof ParameterizedType) {
+      if (((ParameterizedType) t).getRawType() == List.class) {
+        Type typ = ((ParameterizedType) t).getActualTypeArguments()[0];
+        map.put("type", "array");
+        map.put("items", getSchema(typ));
+      } else if (((ParameterizedType) t).getRawType() == Map.class) {
+        Type typ = ((ParameterizedType) t).getActualTypeArguments()[0];
 
 Review comment:
   yeah, it's useless if you use a Map with unknown types

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