siddharthteotia commented on a change in pull request #6546:
URL: https://github.com/apache/incubator-pinot/pull/6546#discussion_r572457056



##########
File path: 
pinot-tools/src/main/java/org/apache/pinot/tools/data/generator/StringGenerator.java
##########
@@ -56,11 +65,18 @@ public void init() {
 
   @Override
   public Object next() {
+    if (numberOfValuesPerEntry == 1) {
+      return getNextString();
+    }
+    return 
MultiValueGeneratorHelper.generateMultiValueEntries(numberOfValuesPerEntry, 
rand, this::getNextString);
+  }
+
+  private String getNextString() {
     return vals.get(rand.nextInt(cardinality));

Review comment:
       Vals is a hashmap. This is where we are going to run into issues with 
generation based approach where the characteristics file specifies a very high 
cardinality for column(s). The HashMap will likely hit OOM. So the other 
approach of estimating the memory without the completed segment all together 
becomes quite essential. 




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