pranavbhole commented on code in PR #15434:
URL: https://github.com/apache/druid/pull/15434#discussion_r1408714128
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processing/src/main/java/org/apache/druid/query/aggregation/any/StringAnyVectorAggregator.java:
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@@ -78,7 +84,22 @@ public void aggregate(ByteBuffer buf, int position, int
startRow, int endRow)
if (startRow < rows.length) {
IndexedInts row = rows[startRow];
@Nullable
- String foundValue = row.size() == 0 ? null :
multiValueSelector.lookupName(row.get(0));
+ String foundValue;
+ if (row.size() == 0) {
+ foundValue = null;
+ } else if (aggregateMultipleValues) {
+ if (row.size() > 1) {
+ List<String> arrayList = new ArrayList<>();
+ row.forEach(rowIndex -> {
+ arrayList.add(multiValueSelector.lookupName(rowIndex));
+ });
+ foundValue =
DimensionHandlerUtils.convertObjectToString(arrayList);
+ } else {
+ foundValue = multiValueSelector.lookupName(row.get(0));
Review Comment:
DimensionHandlerUtils.convertObjectToString handles null value and here
foundValue null is also handled.
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