aditya-gupta36 commented on code in PR #373:
URL: https://github.com/apache/atlas/pull/373#discussion_r2199931094


##########
webapp/src/main/java/org/apache/atlas/web/rest/DiscoveryREST.java:
##########
@@ -892,27 +892,47 @@ private void validateSearchParameters(SearchParameters 
parameters) throws AtlasB
 
     private void validateEntityFilter(SearchParameters parameters) throws 
AtlasBaseException {
         FilterCriteria entityFilter = parameters.getEntityFilters();
+        FilterCriteria tagFilter = parameters.getTagFilters();
 
-        if (entityFilter == null) {
-            return;
+        if (checkEmptyFilterCriteria(entityFilter) ) {
+            validateNestedCriteria(entityFilter);
         }
 
-        if (entityFilter.getCriterion() != null &&
-                !entityFilter.getCriterion().isEmpty()) {
-            if (entityFilter.getCondition() == null || 
StringUtils.isEmpty(entityFilter.getCondition().toString())) {
+        if (checkEmptyFilterCriteria(tagFilter)) {
+            validateNestedCriteria(tagFilter);
+        }
+    }
+
+    private boolean checkEmptyFilterCriteria(FilterCriteria criteria) {

Review Comment:
   Example of Request which substantiates the above changes:
   
   curl 
'http://ccycloud-1.fsknox.root.comops.site:31000/api/atlas/v2/search/basic' \
     -X POST \
     -H 'User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:140.0) 
Gecko/20100101 Firefox/140.0' \
     -H 'Accept: application/json, text/javascript, */*; q=0.01' \
     -H 'Accept-Language: en-US,en;q=0.5' \
     -H 'Accept-Encoding: gzip, deflate' \
     -H 'Content-Type: application/json' \
     -H 'X-XSRF-HEADER: EEQgZd00cPbAAJZZr9zA' \
     -H 'X-Requested-With: XMLHttpRequest' \
     -H 'Origin: http://ccycloud-1.fsknox.root.comops.site:31000' \
     -H 'Connection: keep-alive' \
     -H 'Referer: http://ccycloud-1.fsknox.root.comops.site:31000/index.html' \
     -H 'Cookie: SESSION=NDhlYWU2YmYtNTc4OC00NTVlLWI3MmEtNTk1MzY5MjgzZGJl; 
ATLASSESSIONID=node0p7tci3nip451oc6i1u75z6h7.node0' \
     --data-raw '{
       "excludeDeletedEntities": true,
       "includeSubClassifications": true,
       "includeSubTypes": true,
       "includeClassificationAttributes": true,
       "entityFilters": null,
       "tagFilters": {
         "condition": "AND",
         "criterion": [
           {
             "attributeName": "__timestamp",
             "operator": "eq",
             "attributeValue": "1752219388000"
           },
           {
             "condition": "AND",
             "criterion": []
           }
         ]
       },
       "attributes": [],
       "limit": 25,
       "offset": 0,
       "typeName": null,
       "classification": "_ALL_CLASSIFICATION_TYPES",
       "termName": null
     }' \
     --insecure
   
   
   Above "criterion" : [] -> intentionally put empty



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