yabola commented on code in PR #1023:
URL: https://github.com/apache/parquet-mr/pull/1023#discussion_r1113173851
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parquet-hadoop/src/main/java/org/apache/parquet/filter2/statisticslevel/StatisticsFilter.java:
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@@ -289,8 +320,14 @@ public <T extends Comparable<T>> Boolean visit(Lt<T> lt) {
T value = lt.getValue();
- // drop if value <= min
- return stats.compareMinToValue(value) >= 0;
+ // we are looking for records where v < someValue
+ if (stats.compareMinToValue(value) >= 0) {
+ // drop if value <= min
+ return BLOCK_CANNOT_MATCH;
+ } else {
+ // if value > min, we must take it
+ return BLOCK_MUST_MATCH;
Review Comment:
@gszadovszky Thank you for your reply!
In the original implementation, `BLOCK_MUST_MATCH` can be judged using
minMax.
So if we follow the specification, can we use minMax as the data result of
an enlarged range. So we can accurately judge that when the data is not in this
range.
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