[core] Optimize logging for expiring partitions (#3896)

diff --git a/paimon-core/src/main/java/org/apache/paimon/operation/PartitionExpire.java b/paimon-core/src/main/java/org/apache/paimon/operation/PartitionExpire.java
index ebc31f7..b769fc8 100644
--- a/paimon-core/src/main/java/org/apache/paimon/operation/PartitionExpire.java
+++ b/paimon-core/src/main/java/org/apache/paimon/operation/PartitionExpire.java
@@ -98,7 +98,7 @@
             Object[] array = strategy.convertPartition(partition.partition());
             Map<String, String> partString = strategy.toPartitionString(array);
             expired.add(partString);
-            LOG.info("Expire Partition: {}", partition);
+            LOG.info("Expire Partition: {}", partString);
         }
         if (!expired.isEmpty()) {
             if (metastoreClient != null) {