JingsongLi commented on code in PR #1416:
URL: https://github.com/apache/incubator-paimon/pull/1416#discussion_r1236290098
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paimon-core/src/main/java/org/apache/paimon/mergetree/compact/PartialUpdateMergeFunction.java:
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@@ -190,11 +193,36 @@ private Factory(Options options, RowType rowType) {
@Override
public MergeFunction<KeyValue> create(@Nullable int[][] projection) {
List<DataType> fieldTypes = tableTypes;
+ Map<Integer, SequenceGenerator> projFieldSequences = new
HashMap<>();
+
if (projection != null) {
fieldTypes = Projection.of(projection).project(tableTypes);
+ int[] fieldOldIndex =
Projection.of(projection).toTopLevelIndexes();
+ Map<Integer, Integer> indexMap = new HashMap<>();
+ for (int i = 0; i < fieldOldIndex.length; i++) {
+ indexMap.put(fieldOldIndex[i], i);
+ }
+ for (int index = 0; index < fieldOldIndex.length; index++) {
Review Comment:
loop `fieldSequences` like this:
```
fieldSequences.forEach((field, sequence) -> {
int newField = indexMap.get(field);
if (newField != -1) {
int newSequenceId = indexMap.get(sequence.index());
checkArguement(newSequenceId != -1);
projectedFieldSequences.put(newField, new
SequenceGenerator(newSequenceId, ...));
}
});
```
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