1 /*------------------------------------------------------------------------- 2 * 3 * tupdesc_details.h 4 * POSTGRES tuple descriptor definitions we can't include everywhere 5 * 6 * 7 * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group 8 * Portions Copyright (c) 1994, Regents of the University of California 9 * 10 * src/include/access/tupdesc_details.h 11 * 12 *------------------------------------------------------------------------- 13 */ 14 15 #ifndef TUPDESC_DETAILS_H 16 #define TUPDESC_DETAILS_H 17 18 /* 19 * Structure used to represent value to be used when the attribute is not 20 * present at all in a tuple, i.e. when the column was created after the tuple 21 */ 22 typedef struct AttrMissing 23 { 24 bool am_present; /* true if non-NULL missing value exists */ 25 Datum am_value; /* value when attribute is missing */ 26 } AttrMissing; 27 28 #endif /* TUPDESC_DETAILS_H */ 29