huaxingao commented on code in PR #13167:
URL: https://github.com/apache/iceberg/pull/13167#discussion_r2115224408
##########
spark/v4.0/spark/src/main/java/org/apache/iceberg/spark/functions/BucketFunction.java:
##########
@@ -128,6 +133,23 @@ public String name() {
public DataType resultType() {
return DataTypes.IntegerType;
}
+
+ public int gcd(int num1, int num2) {
+ return
BigInteger.valueOf(num1).gcd(BigInteger.valueOf(num2)).intValueExact();
+ }
+
+ @Override
+ public Reducer<Integer, Integer> reducer(
+ int thisNumBuckets, ReducibleFunction<?, ?> otherBucketFunction, int
otherNumBuckets) {
+
+ if (otherBucketFunction instanceof BucketBase) {
+ int commonDivisor = gcd(thisNumBuckets, otherNumBuckets);
+ if (commonDivisor > 1 && commonDivisor != thisNumBuckets) {
+ return new BucketReducer(commonDivisor);
+ }
+ }
Review Comment:
nit: can we add an empty line in between?
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