text: /* -------------------------------------------------------------------------
   *
   * postgres_ext.h
   *
   *	   This file contains declarations of things that are visible everywhere
   *	in openGauss *and* are visible to clients of frontend interface libraries.
   *	For example, the Oid type is part of the API of libpq and other libraries.
   *
   *	   Declarations which are specific to a particular interface should
   *	go in the header file for that interface (such as libpq-fe.h).	This
   *	file is only for fundamental openGauss declarations.
   *
   *	   User-written C functions don't count as "external to openGauss."
   *	Those function much as local modifications to the backend itself, and
   *	use header files that are otherwise internal to openGauss to interface
   *	with the backend.
   *
   * src/include/postgres_ext.h
   *
   * -------------------------------------------------------------------------
   */
  
  #ifndef POSTGRES_EXT_H
  #define POSTGRES_EXT_H
  
  #include "gs_thread.h"
  /*
   * Object ID is a fundamental type in openGauss.
   */
  typedef unsigned int Oid;
  
  #ifdef __cplusplus
  #define InvalidOid (Oid(0))
  #else
  #define InvalidOid ((Oid)0)
  #endif
  
  #define VirtualBktOid     (Oid(1))
  #define VirtualSegmentOid (Oid(2))
  #define InvalidBktId      (-1)
  #define SegmentBktId      (16384)
  
  #define BUCKET_NODE_IS_VALID(bucket_node) ((bucket_node) > InvalidBktId && (bucket_node) < SegmentBktId)
  #define BUCKET_OID_IS_VALID(bucketOid) ((bucketOid) >= FirstNormalObjectId)
  
  #define OID_MAX  UINT_MAX
  
  /* you will need to include <limits.h> to use the above #define */
  
  /*
   * Identifiers of error message fields.  Kept here to keep common
   * between frontend and backend, and also to export them to libpq
   * applications.
   */
  #define PG_DIAG_SEVERITY 'S'
  #define PG_DIAG_SQLSTATE 'C'
  #define PG_DIAG_INTERNEL_ERRCODE 'c'
  #define PG_DIAG_MESSAGE_PRIMARY 'M'
  #define PG_DIAG_MESSAGE_DETAIL 'D'
  #define PG_DIAG_MESSAGE_HINT 'H'
  #define PG_DIAG_STATEMENT_POSITION 'P'
  #define PG_DIAG_INTERNAL_POSITION 'p'
  #define PG_DIAG_INTERNAL_QUERY 'q'
  #define PG_DIAG_CONTEXT 'W'
  #define PG_DIAG_SOURCE_FILE 'F'
  #define PG_DIAG_SOURCE_LINE 'L'
  #define PG_DIAG_SOURCE_FUNCTION 'R'
  #define PG_DIAG_MESSAGE_ONLY 'm'
  #define PG_DIAG_MODULE_ID 'd'
  
  #endif
  