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/*-------------------------------------------------------------------------
*
* queryjumble.h
* Query normalization and fingerprinting.
*
* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/include/utils/queryjumble.h
*
*-------------------------------------------------------------------------
*/
#ifndef QUERYJUBLE_H
#define QUERYJUBLE_H
#include "nodes/parsenodes.h"
#define JUMBLE_SIZE 1024 /* query serialization buffer size */
/*
* 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;
const char *CleanQuerytext(const char *query, int *location, int *len);
JumbleState *JumbleQuery(Query *query, const char *querytext);
#endif /* QUERYJUMBLE_H */
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