greenplumn pg_attribute_encoding 源码
greenplumn pg_attribute_encoding 代码
文件路径：/src/include/catalog/pg_attribute_encoding.h
/*-------------------------------------------------------------------------
*
* pg_attribute_encoding.h
* some where to stash column level ENCODING () clauses
*
* GPDB_90_MERGE_FIXME: pg_attribute now has an attoptions field. We should
* get rid of this table, and start using pg_attribute.attoptions instead.
*
* Portions Copyright (c) EMC, 2011
* Portions Copyright (c) 2012-Present VMware, Inc. or its affiliates.
*
*
* IDENTIFICATION
* src/include/catalog/pg_attribute_encoding.h
*
*-------------------------------------------------------------------------
*/
#ifndef PG_ATTRIBUTE_ENCODING_H
#define PG_ATTRIBUTE_ENCODING_H
#include "catalog/genbki.h"
#include "catalog/pg_attribute_encoding_d.h"
#include "utils/rel.h"
/* ----------------
* pg_attribute_encoding definition. cpp turns this into
* typedef struct FormData_pg_attribute_encoding
* ----------------
*/
CATALOG(pg_attribute_encoding,6231,AttributeEncodingRelationId)
{
Oid attrelid;
int16 attnum;
#ifdef CATALOG_VARLEN /* variable-length fields start here */
text attoptions[1];
#endif
} FormData_pg_attribute_encoding;
/* GPDB added foreign key definitions for gpcheckcat. */
FOREIGN_KEY(attrelid REFERENCES pg_attribute(attrelid));
/* ----------------
* Form_pg_attribute_encoding corresponds to a pointer to a tuple with
* the format of pg_attribute_encoding relation.
* ----------------
*/
typedef FormData_pg_attribute_encoding *Form_pg_attribute_encoding;
extern PGFunction *get_funcs_for_compression(char *compresstype);
extern StdRdOptions **RelationGetAttributeOptions(Relation rel);
extern List **RelationGetUntransformedAttributeOptions(Relation rel);
extern void AddRelationAttributeEncodings(Relation rel, List *attr_encodings);
extern void RemoveAttributeEncodingsByRelid(Oid relid);
extern void cloneAttributeEncoding(Oid oldrelid, Oid newrelid, AttrNumber max_attno);
extern Datum *get_rel_attoptions(Oid relid, AttrNumber max_attno);
extern List * rel_get_column_encodings(Relation rel);
#endif /* PG_ATTRIBUTE_ENCODING_H */
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