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-rw-r--r--src/include/utils/relfilenodemap.h18
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diff --git a/src/include/utils/relfilenodemap.h b/src/include/utils/relfilenodemap.h
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+/*-------------------------------------------------------------------------
+ *
+ * relfilenodemap.h
+ * relfilenode to oid mapping cache.
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/utils/relfilenodemap.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef RELFILENODEMAP_H
+#define RELFILENODEMAP_H
+
+extern Oid RelidByRelfilenode(Oid reltablespace, Oid relfilenode);
+
+#endif /* RELFILENODEMAP_H */