(pinot) branch hotfix-array-agg updated: Fix Null value for group by queries when no aggregate was called (#15458)

[jlli]

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jlli pushed a commit to branch hotfix-array-agg
in repository https://gitbox.apache.org/repos/asf/pinot.git


The following commit(s) were added to refs/heads/hotfix-array-agg by this push:
     new e7f418442f Fix Null value for group by queries when no aggregate was 
called (#15458)
e7f418442f is described below

commit e7f418442fb0069694549779334b9ba4f3b6e3f0
Author: Jialiang Li <j...@linkedin.com>
AuthorDate: Thu Apr 3 15:54:12 2025 -0700

    Fix Null value for group by queries when no aggregate was called (#15458)
---
 .../pinot/core/operator/blocks/results/GroupByResultsBlock.java      | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git 
a/pinot-core/src/main/java/org/apache/pinot/core/operator/blocks/results/GroupByResultsBlock.java
 
b/pinot-core/src/main/java/org/apache/pinot/core/operator/blocks/results/GroupByResultsBlock.java
index 21eeea73ca..3413b79a1b 100644
--- 
a/pinot-core/src/main/java/org/apache/pinot/core/operator/blocks/results/GroupByResultsBlock.java
+++ 
b/pinot-core/src/main/java/org/apache/pinot/core/operator/blocks/results/GroupByResultsBlock.java
@@ -243,8 +243,9 @@ public class GroupByResultsBlock extends BaseResultsBlock {
         Object[] values = iterator.next().getValues();
         for (int i = 0; i < numColumns; i++) {
           Object value = values[i];
-          assert value != null;
-          if (storedColumnDataTypes[i] == ColumnDataType.OBJECT) {
+          if (value == null) {
+            dataTableBuilder.setNull(i);
+          } else if (storedColumnDataTypes[i] == ColumnDataType.OBJECT) {
             dataTableBuilder.setColumn(i, aggregationFunctions[i - 
numKeyColumns].serializeIntermediateResult(value));
           } else {
             setDataTableColumn(storedColumnDataTypes[i], dataTableBuilder, i, 
value);


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