ankitsultana commented on code in PR #14981:
URL: https://github.com/apache/pinot/pull/14981#discussion_r1941785723
##########
pinot-query-runtime/src/main/java/org/apache/pinot/query/runtime/operator/groupby/GroupIdGeneratorFactory.java:
##########
@@ -25,24 +25,27 @@ public class GroupIdGeneratorFactory {
private GroupIdGeneratorFactory() {
}
- public static GroupIdGenerator getGroupIdGenerator(ColumnDataType[]
keyTypes, int numKeyColumns, int numGroupsLimit) {
+ public static GroupIdGenerator getGroupIdGenerator(ColumnDataType[]
keyTypes, int numKeyColumns,
+ int numGroupsLimit, int maxInitialResultHolderCapacity) {
+ // Initial capacity is one more than expected to avoid rehashing if
container is full.
+ int initialCapacity = 1 + Math.min(maxInitialResultHolderCapacity,
numGroupsLimit);
Review Comment:
Hash table resize would happen based on load factor though right? Adding 1
here might not do much. (default is usually 0.75)
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