pg_index.h

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/*-------------------------------------------------------------------------
 *
 * pg_index.h
 *    definition of the "index" system catalog (pg_index)
 *
 *
 * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/include/catalog/pg_index.h
 *
 * NOTES
 *    The Catalog.pm module reads this file and derives schema
 *    information.
 *
 *-------------------------------------------------------------------------
 */
#ifndef PG_INDEX_H
#define PG_INDEX_H

#include "catalog/genbki.h"
#include "catalog/pg_index_d.h"

/* ----------------
 *      pg_index definition.  cpp turns this into
 *      typedef struct FormData_pg_index.
 * ----------------
 */
CATALOG(pg_index,2610,IndexRelationId) BKI_SCHEMA_MACRO
{
    Oid         indexrelid;     /* OID of the index */
    Oid         indrelid;       /* OID of the relation it indexes */
    int16       indnatts;       /* total number of columns in index */
    int16       indnkeyatts;    /* number of key columns in index */
    bool        indisunique;    /* is this a unique index? */
    bool        indisprimary;   /* is this index for primary key? */
    bool        indisexclusion; /* is this index for exclusion constraint? */
    bool        indimmediate;   /* is uniqueness enforced immediately? */
    bool        indisclustered; /* is this the index last clustered by? */
    bool        indisvalid;     /* is this index valid for use by queries? */
    bool        indcheckxmin;   /* must we wait for xmin to be old? */
    bool        indisready;     /* is this index ready for inserts? */
    bool        indislive;      /* is this index alive at all? */
    bool        indisreplident; /* is this index the identity for replication? */

    /* variable-length fields start here, but we allow direct access to indkey */
    int2vector  indkey;         /* column numbers of indexed cols, or 0 */

#ifdef CATALOG_VARLEN
    oidvector   indcollation;   /* collation identifiers */
    oidvector   indclass;       /* opclass identifiers */
    int2vector  indoption;      /* per-column flags (AM-specific meanings) */
    pg_node_tree indexprs;      /* expression trees for index attributes that
                                 * are not simple column references; one for
                                 * each zero entry in indkey[] */
    pg_node_tree indpred;       /* expression tree for predicate, if a partial
                                 * index; else NULL */
#endif
} FormData_pg_index;

/* ----------------
 *      Form_pg_index corresponds to a pointer to a tuple with
 *      the format of pg_index relation.
 * ----------------
 */
typedef FormData_pg_index *Form_pg_index;

#ifdef EXPOSE_TO_CLIENT_CODE

/*
 * Index AMs that support ordered scans must support these two indoption
 * bits.  Otherwise, the content of the per-column indoption fields is
 * open for future definition.
 */
#define INDOPTION_DESC          0x0001  /* values are in reverse order */
#define INDOPTION_NULLS_FIRST   0x0002  /* NULLs are first instead of last */

#endif                          /* EXPOSE_TO_CLIENT_CODE */

#endif                          /* PG_INDEX_H */