| /*------------------------------------------------------------------------- | |
| * | |
| * queryjumble.h | |
| * Query normalization and fingerprinting. | |
| * | |
| * Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group | |
| * Portions Copyright (c) 1994, Regents of the University of California | |
| * | |
| * IDENTIFICATION | |
| * src/include/nodes/queryjumble.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); | |
| 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; | |
| } | |