richardstartin commented on code in PR #8485:
URL: https://github.com/apache/pinot/pull/8485#discussion_r848911057


##########
pinot-core/src/main/java/org/apache/pinot/core/operator/filter/JsonMatchFilterOperator.java:
##########
@@ -87,4 +94,20 @@ public String toExplainString() {
     stringBuilder.append(",predicate:").append(_predicate.toString());
     return stringBuilder.append(')').toString();
   }
+
+  private void record(ImmutableRoaringBitmap bitmap) {
+    InvocationRecording recording = Tracing.activeRecording();
+    if (recording.isEnabled()) {
+      recording.setColumnName(_predicate.getLhs().getIdentifier());
+      recording.setFilter(FilterType.INDEX, describeJsonPredicate());
+      recording.setNumDocsMatchingAfterFilter(bitmap.getCardinality());
+    }
+  }
+
+  private String describeJsonPredicate() {

Review Comment:
   I'll leave it this way for now (recording JSON_MATCH) because I want to 
progress, but capturing the parsed filter expression was IMO a lot more 
valuable than this.



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