Merge pull request #432 from hypertrace/fix-npe-get-column-properties

chore: fix NullPointerException

Author: ravisingal

pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/index/loader/IndexLoadingConfig.java

@@ -401,10 +401,13 @@ public void addKnownColumns(Set<String> columns) {
 
   public Map<String, Map<String, String>> getColumnProperties() {
     Map<String, Map<String, String>> columnProperties = new HashMap<>();
-    List<FieldConfig> fieldConfigs = _tableConfig.getFieldConfigList();
-    if (fieldConfigs != null) {
-      for (FieldConfig fieldConfig : fieldConfigs) {
-        columnProperties.put(fieldConfig.getName(), fieldConfig.getProperties());
+    if (_tableConfig != null) {
+      List<FieldConfig> fieldConfigs = _tableConfig.getFieldConfigList();
+      if (fieldConfigs != null) {
+        for (FieldConfig fieldConfig : fieldConfigs) {
+          columnProperties.put(fieldConfig.getName(), fieldConfig.getProperties());
+        }
+        return columnProperties;
       }
     }
     return Map.of();