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5fd9dfa5f5
Add compute_query_id GUC to control whether a query identifier should be computed by the core (off by default). It's thefore now possible to disable core queryid computation and use pg_stat_statements with a different algorithm to compute the query identifier by using a third-party module. To ensure that a single source of query identifier can be used and is well defined, modules that calculate a query identifier should throw an error if compute_query_id specified to compute a query id and if a query idenfitier was already calculated. Discussion: https://postgr.es/m/20210407125726.tkvjdbw76hxnpwfi@nol Author: Julien Rouhaud Reviewed-by: Alvaro Herrera, Nitin Jadhav, Zhihong Yu
58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* queryjumble.h
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* Query normalization and fingerprinting.
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*
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* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* src/include/utils/queryjumble.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef QUERYJUBLE_H
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#define QUERYJUBLE_H
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#include "nodes/parsenodes.h"
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#define JUMBLE_SIZE 1024 /* query serialization buffer size */
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/*
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* Struct for tracking locations/lengths of constants during normalization
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*/
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typedef struct LocationLen
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{
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int location; /* start offset in query text */
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int length; /* length in bytes, or -1 to ignore */
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} LocationLen;
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/*
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* Working state for computing a query jumble and producing a normalized
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* query string
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*/
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typedef struct JumbleState
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{
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/* Jumble of current query tree */
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unsigned char *jumble;
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/* Number of bytes used in jumble[] */
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Size jumble_len;
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/* Array of locations of constants that should be removed */
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LocationLen *clocations;
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/* Allocated length of clocations array */
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int clocations_buf_size;
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/* Current number of valid entries in clocations array */
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int clocations_count;
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/* highest Param id we've seen, in order to start normalization correctly */
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int highest_extern_param_id;
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} JumbleState;
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const char *CleanQuerytext(const char *query, int *location, int *len);
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JumbleState *JumbleQuery(Query *query, const char *querytext);
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#endif /* QUERYJUMBLE_H */
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