87 lines
2.1 KiB
C
87 lines
2.1 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) 1996-2023, 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/nodes/queryjumble.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef QUERYJUMBLE_H
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#define QUERYJUMBLE_H
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#include "nodes/parsenodes.h"
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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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/* Values for the compute_query_id GUC */
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enum ComputeQueryIdType
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{
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COMPUTE_QUERY_ID_OFF,
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COMPUTE_QUERY_ID_ON,
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COMPUTE_QUERY_ID_AUTO,
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COMPUTE_QUERY_ID_REGRESS
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};
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/* GUC parameters */
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extern PGDLLIMPORT int compute_query_id;
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extern const char *CleanQuerytext(const char *query, int *location, int *len);
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extern JumbleState *JumbleQuery(Query *query, const char *querytext);
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extern void EnableQueryId(void);
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extern PGDLLIMPORT bool query_id_enabled;
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/*
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* Returns whether query identifier computation has been enabled, either
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* directly in the GUC or by a module when the setting is 'auto'.
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*/
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static inline bool
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IsQueryIdEnabled(void)
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{
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if (compute_query_id == COMPUTE_QUERY_ID_OFF)
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return false;
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if (compute_query_id == COMPUTE_QUERY_ID_ON)
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return true;
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return query_id_enabled;
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}
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#endif /* QUERYJUMBLE_H */
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