diff --git a/core/trino-main/src/main/java/io/trino/server/protocol/spooling/PreferredQueryDataEncoderSelector.java b/core/trino-main/src/main/java/io/trino/server/protocol/spooling/PreferredQueryDataEncoderSelector.java
index 4bd921039712b..0e15538810007 100644
--- a/core/trino-main/src/main/java/io/trino/server/protocol/spooling/PreferredQueryDataEncoderSelector.java
+++ b/core/trino-main/src/main/java/io/trino/server/protocol/spooling/PreferredQueryDataEncoderSelector.java
@@ -48,7 +48,7 @@ public Optional<QueryDataEncoder.Factory> select(List<String> encodingIds)
                 return Optional.of(encoders.get(encodingId));
             }
         }
-        log.warn("None of the requested spooled encodings '%s' are known to the server", encodingIds);
+        log.warn("Requested one of the spooled encodings: %s, but these are only available: %s", encodingIds, encoders.getAvailableEncodings());
         return Optional.empty();
     }
 }
diff --git a/core/trino-main/src/main/java/io/trino/server/protocol/spooling/QueryDataEncoders.java b/core/trino-main/src/main/java/io/trino/server/protocol/spooling/QueryDataEncoders.java
index 41aa19e7da426..3259d51823e15 100644
--- a/core/trino-main/src/main/java/io/trino/server/protocol/spooling/QueryDataEncoders.java
+++ b/core/trino-main/src/main/java/io/trino/server/protocol/spooling/QueryDataEncoders.java
@@ -47,4 +47,9 @@ public QueryDataEncoder.Factory get(String encodingId)
 
         return factories.get(encodingId);
     }
+
+    public Set<String> getAvailableEncodings()
+    {
+        return factories.keySet();
+    }
 }