add error message for NPE (#301)

* add error message for NPE Signed-off-by: xinyual <[email protected]> * apply spotless Signed-off-by: xinyual <[email protected]> * Update src/main/java/org/opensearch/agent/tools/PPLTool.java Co-authored-by: zane-neo <[email protected]> Signed-off-by: Xinyuan Lu <[email protected]> * fix spot less Signed-off-by: xinyual <[email protected]> --------- Signed-off-by: xinyual <[email protected]> Signed-off-by: Xinyuan Lu <[email protected]> Co-authored-by: zane-neo <[email protected]>
opensearch-project · Apr 30, 2024 · 05def20 · 05def20
1 parent 5588571
commit 05def20
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/src/main/java/org/opensearch/agent/tools/PPLTool.java b/src/main/java/org/opensearch/agent/tools/PPLTool.java
@@ -387,6 +387,11 @@ private String constructTableInfo(SearchHit[] searchHits, Map<String, MappingMet
         String firstIndexName = (String) mappings.keySet().toArray()[0];
         MappingMetadata mappingMetadata = mappings.get(firstIndexName);
         Map<String, Object> mappingSource = (Map<String, Object>) mappingMetadata.getSourceAsMap().get("properties");
+        if (Objects.isNull(mappingSource)) {
+            throw new IllegalArgumentException(
+                "The querying index doesn't have mapping metadata, please add data to it or using another index."
+            );
+        }
         Map<String, String> fieldsToType = new HashMap<>();
         extractNamesTypes(mappingSource, fieldsToType, "");
         StringJoiner tableInfoJoiner = new StringJoiner("\n");