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/*-------------------------------------------------------------------------
*
* statistics_format.h
* Data related to the format of extended statistics, usable by both
* frontend and backend code.
*
* Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/include/statistics/statistics_format.h
*
*-------------------------------------------------------------------------
*/
#ifndef STATISTICS_FORMAT_H
#define STATISTICS_FORMAT_H
/* ----------
* pg_ndistinct in human-readable format is a JSON array made of elements with
* a predefined set of keys, like:
*
* [{"ndistinct": 11, "attributes": [3,4]},
* {"ndistinct": 11, "attributes": [3,6]},
* {"ndistinct": 11, "attributes": [4,6]},
* {"ndistinct": 11, "attributes": [3,4,6]},
* ... ]
* ----------
*/
#define PG_NDISTINCT_KEY_ATTRIBUTES "attributes"
#define PG_NDISTINCT_KEY_NDISTINCT "ndistinct"
/* ----------
* pg_dependencies in human-readable format is a JSON array made of elements
* with a predefined set of keys, like:
*
* [{"degree": 1.000000, "attributes": [3], "dependency": 4},
* {"degree": 1.000000, "attributes": [3], "dependency": 6},
* ... ]
* ----------
*/
#define PG_DEPENDENCIES_KEY_ATTRIBUTES "attributes"
#define PG_DEPENDENCIES_KEY_DEPENDENCY "dependency"
#define PG_DEPENDENCIES_KEY_DEGREE "degree"
#endif /* STATISTICS_FORMAT_H */
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