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[Core][BUG-FIX] Fix distinct collect agg bug of un-merged initial collect. #7025

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[Core][BUG-FIX] Fix distinct collect agg bug of un-merged initial collect. #7025

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4 changes: 4 additions & 0 deletions ...n-core/src/main/java/org/apache/paimon/mergetree/compact/ReducerMergeFunctionWrapper.java
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,10 @@ public void reset() {
public void add(KeyValue kv) {
if (initialKv == null) {
initialKv = kv;
if (kv.isAdd()) {
merge(initialKv);
isInitialized = true;
}
} else {
if (!isInitialized) {
merge(initialKv);
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8 changes: 6 additions & 2 deletions ...nk-common/src/test/java/org/apache/paimon/flink/aggregation/CollectAggregationITCase.java
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Original file line number Diff line number Diff line change
Expand Up @@ -61,23 +61,27 @@ public void testAggWithDistinct() {
"INSERT INTO test_collect VALUES "
+ "(1, CAST (NULL AS ARRAY<STRING>)), "
+ "(2, ARRAY['A', 'B']), "
+ "(3, ARRAY['car', 'watch'])");
+ "(3, ARRAY['car', 'watch']), "
+ "(4, ARRAY['A', 'B', 'A'])");

List<Row> result = queryAndSort("SELECT * FROM test_collect");
checkOneRecord(result.get(0), 1);
checkOneRecord(result.get(1), 2, "A", "B");
checkOneRecord(result.get(2), 3, "car", "watch");
checkOneRecord(result.get(3), 4, "A", "B");

sql(
"INSERT INTO test_collect VALUES "
+ "(1, ARRAY['paimon', 'paimon']), "
+ "(2, ARRAY['A', 'B', 'C']), "
+ "(3, CAST (NULL AS ARRAY<STRING>))");
+ "(3, CAST (NULL AS ARRAY<STRING>)), "
+ "(4, ARRAY['C', 'D', 'C'])");

result = queryAndSort("SELECT * FROM test_collect");
checkOneRecord(result.get(0), 1, "paimon");
checkOneRecord(result.get(1), 2, "A", "B", "C");
checkOneRecord(result.get(2), 3, "car", "watch");
checkOneRecord(result.get(3), 4, "A", "B", "C", "D");
}

@Test
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