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diff --git a/contrib/pg_prewarm/expected/pg_prewarm.out b/contrib/pg_prewarm/expected/pg_prewarm.out
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+++ b/contrib/pg_prewarm/expected/pg_prewarm.out
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+-- Test pg_prewarm extension
+CREATE EXTENSION pg_prewarm;
+-- pg_prewarm() should fail if the target relation has no storage.
+CREATE TABLE test (c1 int) PARTITION BY RANGE (c1);
+SELECT pg_prewarm('test', 'buffer');
+ERROR:  relation "test" does not have storage
+DETAIL:  This operation is not supported for partitioned tables.
+-- Cleanup
+DROP TABLE test;
+DROP EXTENSION pg_prewarm;