greenplumn attnum 源码
greenplumn attnum 代码
文件路径：/src/include/access/attnum.h
/*-------------------------------------------------------------------------
*
* attnum.h
* POSTGRES attribute number definitions.
*
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/access/attnum.h
*
*-------------------------------------------------------------------------
*/
#ifndef ATTNUM_H
#define ATTNUM_H
/*
* user defined attribute numbers start at 1. -ay 2/95
*/
typedef int16 AttrNumber;
#define InvalidAttrNumber 0
#define MaxAttrNumber 32767
/* ----------------
* support macros
* ----------------
*/
/*
* AttributeNumberIsValid
* True iff the attribute number is valid.
*/
#define AttributeNumberIsValid(attributeNumber) \
((bool) ((attributeNumber) != InvalidAttrNumber))
/*
* AttrNumberIsForUserDefinedAttr
* True iff the attribute number corresponds to an user defined attribute.
*/
#define AttrNumberIsForUserDefinedAttr(attributeNumber) \
((bool) ((attributeNumber) > 0))
/*
* AttrNumberGetAttrOffset
* Returns the attribute offset for an attribute number.
*
* Note:
* Assumes the attribute number is for a user defined attribute.
*/
#define AttrNumberGetAttrOffset(attNum) \
( \
AssertMacro(AttrNumberIsForUserDefinedAttr(attNum)), \
((attNum) - 1) \
)
/*
* AttrOffsetGetAttrNumber
* Returns the attribute number for an attribute offset.
*/
#define AttrOffsetGetAttrNumber(attributeOffset) \
((AttrNumber) (1 + (attributeOffset)))
#endif /* ATTNUM_H */
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