wirybeaver commented on code in PR #12242:
URL: https://github.com/apache/pinot/pull/12242#discussion_r1452592342


##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/index/readers/forward/VarByteChunkSVForwardIndexReader.java:
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@@ -85,6 +85,10 @@ private String getStringCompressed(int docId, 
ChunkReaderContext context) {
 
     int length = valueEndOffset - valueStartOffset;
     byte[] bytes = _reusableBytes.get();
+    if (bytes.length < _lengthOfLongestEntry) {

Review Comment:
   *static threadLocal byte[] of IndexReader*
   Pros: allocated only once per segment per thread;
   Cons: memory won't be deallocated even no queries.
   
   * byte[] of ReaderContext and implement close() method to remove threadLocal*
   Pros: deallocate the memory in time when query gets finished.
   Cons: repetitive allocation of byte[] array per query, query latency might 
tumble; need to check the usage of ReaderContext carefully to ensure the 
close() will be invoked finally after the query is completed (either failure or 
success)



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