greenplumn attoptcache 源码
greenplumn attoptcache 代码
文件路径：/src/include/utils/attoptcache.h
/*-------------------------------------------------------------------------
*
* attoptcache.h
* Attribute options cache.
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/utils/attoptcache.h
*
*-------------------------------------------------------------------------
*/
#ifndef ATTOPTCACHE_H
#define ATTOPTCACHE_H
/*
* Attribute options.
*/
typedef struct AttributeOpts
{
int32 vl_len_; /* varlena header (do not touch directly!) */
float8 n_distinct;
float8 n_distinct_inherited;
} AttributeOpts;
AttributeOpts *get_attribute_options(Oid spcid, int attnum);
#endif /* ATTOPTCACHE_H */
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