greenplumn tupdesc_details 源码
greenplumn tupdesc_details 代码
文件路径：/src/include/access/tupdesc_details.h
/*-------------------------------------------------------------------------
*
* tupdesc_details.h
* POSTGRES tuple descriptor definitions we can't include everywhere
*
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/access/tupdesc_details.h
*
*-------------------------------------------------------------------------
*/
#ifndef TUPDESC_DETAILS_H
#define TUPDESC_DETAILS_H
/*
* Structure used to represent value to be used when the attribute is not
* present at all in a tuple, i.e. when the column was created after the tuple
*/
typedef struct AttrMissing
{
bool am_present; /* true if non-NULL missing value exists */
Datum am_value; /* value when attribute is missing */
} AttrMissing;
#endif /* TUPDESC_DETAILS_H */
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