aokolnychyi commented on a change in pull request #2210:
URL: https://github.com/apache/iceberg/pull/2210#discussion_r591002149



##########
File path: spark/src/main/java/org/apache/iceberg/spark/SparkTableUtil.java
##########
@@ -621,6 +640,32 @@ public static void importSparkPartitions(
     }
   }
 
+  public static List<SparkPartition> filterPartitions(List<SparkPartition> 
partitions,
+                                                      Map<String, String> 
partitionFilter) {
+    if (partitionFilter.isEmpty()) {
+      // No partition filter arg
+
+      if (partitions.isEmpty()) {
+        throw new IllegalArgumentException("Cannot add files, no files found 
in the table.");
+      }
+      return partitions;
+    } else {
+      // Partition filter arg passed
+
+      List<SparkTableUtil.SparkPartition> filteredPartitions = partitions
+          .stream().filter(p -> 
p.getValues().entrySet().containsAll(partitionFilter.entrySet()))
+          .collect(Collectors.toList());
+
+      Preconditions.checkArgument(!filteredPartitions.isEmpty(),

Review comment:
       Well, this one is a bit different. So we could probably validate it 
here. Do we need to actually fail this with an exception? Or should this be 
noop if no partitions match our filter?




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