Jackie-Jiang commented on code in PR #10234:
URL: https://github.com/apache/pinot/pull/10234#discussion_r1120998078


##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/indexsegment/mutable/MutableSegmentImpl.java:
##########
@@ -558,15 +560,40 @@ private RecordInfo getRecordInfo(GenericRow row, int 
docId) {
     PrimaryKey primaryKey = row.getPrimaryKey(_schema.getPrimaryKeyColumns());
 
     if (isUpsertEnabled()) {
-      Object upsertComparisonValue = row.getValue(_upsertComparisonColumn);
-      Preconditions.checkState(upsertComparisonValue instanceof Comparable,
-          "Upsert comparison column: %s must be comparable", 
_upsertComparisonColumn);
-      return new RecordInfo(primaryKey, docId, (Comparable) 
upsertComparisonValue);
+      if (_upsertComparisonColumns.size() > 1) {
+        return multiComparisonRecordInfo(primaryKey, docId, row);
+      }
+      Comparable comparisonValue = (Comparable) 
row.getValue(_upsertComparisonColumns.get(0));
+      return new RecordInfo(primaryKey, docId, comparisonValue);
     }
 
     return new RecordInfo(primaryKey, docId, null);
   }
 
+  private RecordInfo multiComparisonRecordInfo(PrimaryKey primaryKey, int 
docId, GenericRow row) {
+    int numComparisonColumns = _upsertComparisonColumns.size();
+    Comparable[] comparisonValues = new Comparable[numComparisonColumns];
+
+    int numNonNull = 0;
+    for (int i = 0; i < numComparisonColumns; i++) {
+      String columnName = _upsertComparisonColumns.get(i);
+
+      if (!row.isNullValue(columnName)) {
+        // Inbound records may only have exactly 1 non-null value in one of 
the comparison column i.e. comparison
+        // columns are mutually exclusive
+        numNonNull++;
+
+        Object comparisonValue = row.getValue(columnName);
+        Preconditions.checkState(comparisonValue instanceof Comparable,
+            "Upsert comparison column: %s must be comparable", columnName);
+        comparisonValues[i] = (Comparable) comparisonValue;
+      }
+    }
+    Preconditions.checkState(numNonNull == 1 || numNonNull == 0,

Review Comment:
   Either way is fine. If we want to make the rule more strict, we may check if 
it is strict `== 1`.



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