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-rw-r--r--src/include/access/sysattr.h29
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diff --git a/src/include/access/sysattr.h b/src/include/access/sysattr.h
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+/*-------------------------------------------------------------------------
+ *
+ * sysattr.h
+ * POSTGRES system attribute definitions.
+ *
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/access/sysattr.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef SYSATTR_H
+#define SYSATTR_H
+
+
+/*
+ * Attribute numbers for the system-defined attributes
+ */
+#define SelfItemPointerAttributeNumber (-1)
+#define MinTransactionIdAttributeNumber (-2)
+#define MinCommandIdAttributeNumber (-3)
+#define MaxTransactionIdAttributeNumber (-4)
+#define MaxCommandIdAttributeNumber (-5)
+#define TableOidAttributeNumber (-6)
+#define FirstLowInvalidHeapAttributeNumber (-7)
+
+#endif /* SYSATTR_H */