somu-imply commented on code in PR #14237:
URL: https://github.com/apache/druid/pull/14237#discussion_r1190581796
##########
processing/src/main/java/org/apache/druid/segment/join/table/IndexedTableJoinable.java:
##########
@@ -103,7 +103,8 @@ public ColumnValuesWithUniqueFlag
getNonNullColumnValues(String columnName, fina
}
try (final IndexedTable.Reader reader =
table.columnReader(columnPosition)) {
- // Sorted set to encourage "in" filters that result from this method to
do dictionary lookups in order.
+ // Use a SortedSet so InDimFilter doesn't need to create its own
+ // and to encourage "in" filters that result from this method to do
dictionary lookups in order.
Review Comment:
Addressed
##########
processing/src/main/java/org/apache/druid/segment/join/JoinableFactoryWrapper.java:
##########
@@ -144,9 +144,15 @@ static JoinClauseToFilterConversion convertJoinToFilter(
final Set<String> rightPrefixes
)
{
+ // This optimization kicks in when there is exactly 1 equijoin
+ // The reason being that getNonNullColumnValues uses a TreeSet for
handling duplicates
+ // and does not return values in order.
+ // In case TreeSet if replaced by a LinkedHashSet, duplicates are not
handled correctly
Review Comment:
Addressed
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