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/*-------------------------------------------------------------------------
*
* queryjumble.h
* Query normalization and fingerprinting.
*
* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/include/nodes/queryjumble.h
*
*-------------------------------------------------------------------------
*/
#ifndef QUERYJUMBLE_H
#define QUERYJUMBLE_H
#include "nodes/parsenodes.h"
/*
* Struct for tracking locations/lengths of constants during normalization
*/
typedef struct LocationLen
{
int location; /* start offset in query text */
int length; /* length in bytes, or -1 to ignore */
} LocationLen;
/*
* Working state for computing a query jumble and producing a normalized
* query string
*/
typedef struct JumbleState
{
/* Jumble of current query tree */
unsigned char *jumble;
/* Number of bytes used in jumble[] */
Size jumble_len;
/* Array of locations of constants that should be removed */
LocationLen *clocations;
/* Allocated length of clocations array */
int clocations_buf_size;
/* Current number of valid entries in clocations array */
int clocations_count;
/* highest Param id we've seen, in order to start normalization correctly */
int highest_extern_param_id;
} JumbleState;
/* Values for the compute_query_id GUC */
enum ComputeQueryIdType
{
COMPUTE_QUERY_ID_OFF,
COMPUTE_QUERY_ID_ON,
COMPUTE_QUERY_ID_AUTO,
COMPUTE_QUERY_ID_REGRESS
};
/* GUC parameters */
extern PGDLLIMPORT int compute_query_id;
extern const char *CleanQuerytext(const char *query, int *location, int *len);
extern JumbleState *JumbleQuery(Query *query, const char *querytext);
extern void EnableQueryId(void);
extern PGDLLIMPORT bool query_id_enabled;
/*
* Returns whether query identifier computation has been enabled, either
* directly in the GUC or by a module when the setting is 'auto'.
*/
static inline bool
IsQueryIdEnabled(void)
{
if (compute_query_id == COMPUTE_QUERY_ID_OFF)
return false;
if (compute_query_id == COMPUTE_QUERY_ID_ON)
return true;
return query_id_enabled;
}
#endif /* QUERYJUMBLE_H */
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