diff --git a/src/backend/executor/nodeHashjoin.c b/src/backend/executor/nodeHashjoin.c
index d13efc4d98..f91e69a09d 100644
--- a/src/backend/executor/nodeHashjoin.c
+++ b/src/backend/executor/nodeHashjoin.c
@@ -930,9 +930,17 @@ ExecHashJoinGetSavedTuple(HashJoinState *hjstate,
 		return NULL;
 	}
 	if (nread != sizeof(header))
-		ereport(ERROR,
-				(errcode_for_file_access(),
-				 errmsg("could not read from hash-join temporary file: %m")));
+	{
+		if (errno == 0)
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not read from hash-join temporary file: read only %d of %d bytes",
+							(int) nread, (int) sizeof(header))));
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not read from hash-join temporary file: %m")));
+	}
 	*hashvalue = header[0];
 	tuple = (MinimalTuple) palloc(header[1]);
 	tuple->t_len = header[1];
@@ -940,9 +948,17 @@ ExecHashJoinGetSavedTuple(HashJoinState *hjstate,
 						(void *) ((char *) tuple + sizeof(uint32)),
 						header[1] - sizeof(uint32));
 	if (nread != header[1] - sizeof(uint32))
-		ereport(ERROR,
-				(errcode_for_file_access(),
-				 errmsg("could not read from hash-join temporary file: %m")));
+	{
+		if (errno == 0)
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not read from hash-join temporary file: read only %d of %d bytes",
+							(int) nread, (int) (header[1] - sizeof(uint32)))));
+		else
+			ereport(ERROR,
+					(errcode_for_file_access(),
+					 errmsg("could not read from hash-join temporary file: %m")));
+	}
 	return ExecStoreMinimalTuple(tuple, tupleSlot, true);
 }