temporal_analyze.h

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/*****************************************************************************
 *
 * This MobilityDB code is provided under The PostgreSQL License.
 * Copyright (c) 2016-2023, Université libre de Bruxelles and MobilityDB
 * contributors
 *
 * MobilityDB includes portions of PostGIS version 3 source code released
 * under the GNU General Public License (GPLv2 or later).
 * Copyright (c) 2001-2023, PostGIS contributors
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose, without fee, and without a written
 * agreement is hereby granted, provided that the above copyright notice and
 * this paragraph and the following two paragraphs appear in all copies.
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 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
 * LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION,
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 *****************************************************************************/
 
#ifndef __TEMPORAL_ANALYZE_H__
#define __TEMPORAL_ANALYZE_H__
 
/* PostgreSQL */
#include <postgres.h>
#include <statistics/extended_stats_internal.h>
#include <fmgr.h>
 
/*****************************************************************************/
 
/*
 * Extra data for compute_stats function
 * Structure based on the ArrayAnalyzeExtraData from file array_typanalyze.c
 */
typedef struct
{
  /* Information about array element type */
  Oid typid;           
  Oid eq_opr;          
  Oid lt_opr;          
  bool typbyval;       
  int16 typlen;
  char typalign;
 
  /* Information about the value part of array element */
  Oid value_typid;     
  Oid value_eq_opr;    
  Oid value_lt_opr;    
  bool value_typbyval; 
  int16 value_typlen;
  char value_typalign;
 
  /* Information about the temporal part of array element */
  Oid time_typid;      
  Oid time_eq_opr;     
  Oid time_lt_opr;     
  bool time_typbyval;  
  int16 time_typlen;
  char time_typalign;
 
  /*
   * Lookup data for element type's comparison and hash functions (these are
   * in the type's typcache entry, which we expect to remain valid over the
   * lifespan of the ANALYZE run)
   */
  FmgrInfo *cmp;
  FmgrInfo *hash;
  FmgrInfo *value_cmp;
  FmgrInfo *value_hash;
  FmgrInfo *time_cmp;
  FmgrInfo *time_hash;
 
  /* Saved state from std_typanalyze() */
  AnalyzeAttrComputeStatsFunc std_compute_stats;
  void *std_extra_data;
} TemporalAnalyzeExtraData;
 
/*
 * Extra information used by the default analysis routines
 */
typedef struct
{
  int count;    
  int first;    
} ScalarMCVItem;
 
typedef struct
{
  SortSupport ssup;
  int *tupnoLink;
} CompareScalarsContext;
 
/*****************************************************************************
 * Statistics information for temporal types
 *****************************************************************************/
 
extern Datum temporal_analyze(FunctionCallInfo fcinfo,
  void (*functemp)(VacAttrStats *, AnalyzeAttrFetchFunc, int, double));
 
/*****************************************************************************/
 
#endif