wgtmac commented on code in PR #2989:
URL: https://github.com/apache/parquet-java/pull/2989#discussion_r1719458307


##########
parquet-column/src/main/java/org/apache/parquet/column/impl/ColumnValueCollector.java:
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@@ -36,59 +36,75 @@
 class ColumnValueCollector {
 
   private final ColumnDescriptor path;
+  private final boolean statisticsEnabled;
   private BloomFilterWriter bloomFilterWriter;
   private BloomFilter bloomFilter;
   private Statistics<?> statistics;
   private SizeStatistics.Builder sizeStatisticsBuilder;
 
   ColumnValueCollector(ColumnDescriptor path, BloomFilterWriter 
bloomFilterWriter, ParquetProperties props) {
     this.path = path;
+    this.statisticsEnabled = props.getStatisticsEnabled(path);
     resetPageStatistics();
     initBloomFilter(bloomFilterWriter, props);
   }
 
   void resetPageStatistics() {
-    this.statistics = Statistics.createStats(path.getPrimitiveType());
+    this.statistics = statisticsEnabled ? 
Statistics.createStats(path.getPrimitiveType()) : null;
     this.sizeStatisticsBuilder = SizeStatistics.newBuilder(
         path.getPrimitiveType(), path.getMaxRepetitionLevel(), 
path.getMaxDefinitionLevel());
   }
 
   void writeNull(int repetitionLevel, int definitionLevel) {
-    statistics.incrementNumNulls();
+    if (statistics != null) {

Review Comment:
   Can we create a `NoopStatistics` so we don't need to this check? The point 
of `ColumnValueCollector` class is to avoid any condition as it is in the 
critical path.



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