wgtmac commented on code in PR #3126:
URL: https://github.com/apache/parquet-java/pull/3126#discussion_r1921903844


##########
parquet-column/src/main/java/org/apache/parquet/column/statistics/SizeStatistics.java:
##########
@@ -136,8 +136,10 @@ public SizeStatistics(
       List<Long> definitionLevelHistogram) {
     this.type = type;
     this.unencodedByteArrayDataBytes = unencodedByteArrayDataBytes;
-    this.repetitionLevelHistogram = repetitionLevelHistogram;
-    this.definitionLevelHistogram = definitionLevelHistogram;
+    this.repetitionLevelHistogram =
+        repetitionLevelHistogram == null ? Collections.emptyList() : 
repetitionLevelHistogram;
+    this.definitionLevelHistogram =
+        definitionLevelHistogram == null ? Collections.emptyList() : 
definitionLevelHistogram;

Review Comment:
   This is related to https://github.com/apache/parquet-java/pull/3124. Other 
Parquet implementations might have omitted histogram for certain max_level 
values. Reading these files may cause NPE. Please also help me review that PR 
as well. Thanks!



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