aokolnychyi commented on a change in pull request #1664:
URL: https://github.com/apache/iceberg/pull/1664#discussion_r513584484
##########
File path:
parquet/src/main/java/org/apache/iceberg/parquet/ParquetDictionaryRowGroupFilter.java
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@@ -278,8 +278,27 @@ public Boolean or(Boolean leftResult, Boolean rightResult)
{
Set<T> dictionary = dict(id, ref.comparator());
- // ROWS_CANNOT_MATCH if all values of the dictionary are not in the set
(the intersection is empty)
- return Sets.intersection(dictionary, literalSet).isEmpty() ?
ROWS_CANNOT_MATCH : ROWS_MIGHT_MATCH;
+ // we need to find out the smaller set to iterate through
+ Set<T> smallerSet;
+ Set<T> biggerSet;
+
+ if (literalSet.size() < dictionary.size()) {
+ smallerSet = literalSet;
+ biggerSet = dictionary;
+ } else {
+ smallerSet = dictionary;
+ biggerSet = literalSet;
+ }
+
+ for (T e : smallerSet) {
Review comment:
Calling `isEmpty` on `intersection` is equivalent to just calling
`Collections$disjoint`. We may rely on the order of args but that seems fragile
to me. There is no guarantee the internal implementation won't change.
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