partcache.h

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/*-------------------------------------------------------------------------
 *
 * partcache.h
 *
 * Copyright (c) 1996-2024, PostgreSQL Global Development Group
 *
 * src/include/utils/partcache.h
 *
 *-------------------------------------------------------------------------
 */
#ifndef PARTCACHE_H
#define PARTCACHE_H
 
#include "access/attnum.h"
#include "fmgr.h"
#include "nodes/parsenodes.h"
#include "nodes/pg_list.h"
#include "nodes/primnodes.h"
#include "partitioning/partdefs.h"
#include "utils/relcache.h"
 
/*
 * Information about the partition key of a relation
 */
typedef struct PartitionKeyData
{
    PartitionStrategy strategy; /* partitioning strategy */
    int16       partnatts;      /* number of columns in the partition key */
    AttrNumber *partattrs;      /* attribute numbers of columns in the
                                 * partition key or 0 if it's an expr */
    List       *partexprs;      /* list of expressions in the partitioning
                                 * key, one for each zero-valued partattrs */
 
    Oid        *partopfamily;   /* OIDs of operator families */
    Oid        *partopcintype;  /* OIDs of opclass declared input data types */
    FmgrInfo   *partsupfunc;    /* lookup info for support funcs */
 
    /* Partitioning collation per attribute */
    Oid        *partcollation;
 
    /* Type information per attribute */
    Oid        *parttypid;
    int32      *parttypmod;
    int16      *parttyplen;
    bool       *parttypbyval;
    char       *parttypalign;
    Oid        *parttypcoll;
}           PartitionKeyData;
 
 
extern PartitionKey RelationGetPartitionKey(Relation rel);
extern List *RelationGetPartitionQual(Relation rel);
extern Expr *get_partition_qual_relid(Oid relid);
 
/*
 * PartitionKey inquiry functions
 */
static inline int
get_partition_strategy(PartitionKey key)
{
    return key->strategy;
}
 
static inline int
get_partition_natts(PartitionKey key)
{
    return key->partnatts;
}
 
static inline List *
get_partition_exprs(PartitionKey key)
{
    return key->partexprs;
}
 
/*
 * PartitionKey inquiry functions - one column
 */
static inline int16
get_partition_col_attnum(PartitionKey key, int col)
{
    return key->partattrs[col];
}
 
static inline Oid
get_partition_col_typid(PartitionKey key, int col)
{
    return key->parttypid[col];
}
 
static inline int32
get_partition_col_typmod(PartitionKey key, int col)
{
    return key->parttypmod[col];
}
 
static inline Oid
get_partition_col_collation(PartitionKey key, int col)
{
    return key->partcollation[col];
}
 
#endif                          /* PARTCACHE_H */