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queryjumble.h File Reference
#include "nodes/parsenodes.h"
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Data Structures

struct  LocationLen
 
struct  JumbleState
 

Typedefs

typedef struct LocationLen LocationLen
 
typedef struct JumbleState JumbleState
 

Enumerations

enum  ComputeQueryIdType { COMPUTE_QUERY_ID_OFF , COMPUTE_QUERY_ID_ON , COMPUTE_QUERY_ID_AUTO , COMPUTE_QUERY_ID_REGRESS }
 

Functions

const char * CleanQuerytext (const char *query, int *location, int *len)
 
JumbleStateJumbleQuery (Query *query)
 
void EnableQueryId (void)
 
static bool IsQueryIdEnabled (void)
 

Variables

PGDLLIMPORT int compute_query_id
 
PGDLLIMPORT bool query_id_enabled
 

Typedef Documentation

◆ JumbleState

typedef struct JumbleState JumbleState

◆ LocationLen

typedef struct LocationLen LocationLen

Enumeration Type Documentation

◆ ComputeQueryIdType

Enumerator
COMPUTE_QUERY_ID_OFF 
COMPUTE_QUERY_ID_ON 
COMPUTE_QUERY_ID_AUTO 
COMPUTE_QUERY_ID_REGRESS 

Definition at line 54 of file queryjumble.h.

55 {
60 };
@ COMPUTE_QUERY_ID_AUTO
Definition: queryjumble.h:58
@ COMPUTE_QUERY_ID_REGRESS
Definition: queryjumble.h:59
@ COMPUTE_QUERY_ID_ON
Definition: queryjumble.h:57
@ COMPUTE_QUERY_ID_OFF
Definition: queryjumble.h:56

Function Documentation

◆ CleanQuerytext()

const char* CleanQuerytext ( const char *  query,
int *  location,
int *  len 
)

Definition at line 66 of file queryjumblefuncs.c.

67 {
68  int query_location = *location;
69  int query_len = *len;
70 
71  /* First apply starting offset, unless it's -1 (unknown). */
72  if (query_location >= 0)
73  {
74  Assert(query_location <= strlen(query));
75  query += query_location;
76  /* Length of 0 (or -1) means "rest of string" */
77  if (query_len <= 0)
78  query_len = strlen(query);
79  else
80  Assert(query_len <= strlen(query));
81  }
82  else
83  {
84  /* If query location is unknown, distrust query_len as well */
85  query_location = 0;
86  query_len = strlen(query);
87  }
88 
89  /*
90  * Discard leading and trailing whitespace, too. Use scanner_isspace()
91  * not libc's isspace(), because we want to match the lexer's behavior.
92  */
93  while (query_len > 0 && scanner_isspace(query[0]))
94  query++, query_location++, query_len--;
95  while (query_len > 0 && scanner_isspace(query[query_len - 1]))
96  query_len--;
97 
98  *location = query_location;
99  *len = query_len;
100 
101  return query;
102 }
#define Assert(condition)
Definition: c.h:858
const void size_t len
bool scanner_isspace(char ch)
Definition: scansup.c:117

References Assert, len, and scanner_isspace().

Referenced by pgss_store().

◆ EnableQueryId()

void EnableQueryId ( void  )

Definition at line 150 of file queryjumblefuncs.c.

151 {
153  query_id_enabled = true;
154 }
bool query_id_enabled
int compute_query_id

References compute_query_id, COMPUTE_QUERY_ID_OFF, and query_id_enabled.

Referenced by _PG_init().

◆ IsQueryIdEnabled()

static bool IsQueryIdEnabled ( void  )
inlinestatic

Definition at line 77 of file queryjumble.h.

78 {
80  return false;
82  return true;
83  return query_id_enabled;
84 }
PGDLLIMPORT bool query_id_enabled
PGDLLIMPORT int compute_query_id

References compute_query_id, COMPUTE_QUERY_ID_OFF, COMPUTE_QUERY_ID_ON, and query_id_enabled.

Referenced by ExplainQuery(), JumbleQuery(), parse_analyze_fixedparams(), parse_analyze_varparams(), and parse_analyze_withcb().

◆ JumbleQuery()

JumbleState* JumbleQuery ( Query query)

Definition at line 105 of file queryjumblefuncs.c.

106 {
107  JumbleState *jstate = NULL;
108 
110 
111  jstate = (JumbleState *) palloc(sizeof(JumbleState));
112 
113  /* Set up workspace for query jumbling */
114  jstate->jumble = (unsigned char *) palloc(JUMBLE_SIZE);
115  jstate->jumble_len = 0;
116  jstate->clocations_buf_size = 32;
117  jstate->clocations = (LocationLen *)
118  palloc(jstate->clocations_buf_size * sizeof(LocationLen));
119  jstate->clocations_count = 0;
120  jstate->highest_extern_param_id = 0;
121 
122  /* Compute query ID and mark the Query node with it */
123  _jumbleNode(jstate, (Node *) query);
124  query->queryId = DatumGetUInt64(hash_any_extended(jstate->jumble,
125  jstate->jumble_len,
126  0));
127 
128  /*
129  * If we are unlucky enough to get a hash of zero, use 1 instead for
130  * normal statements and 2 for utility queries.
131  */
132  if (query->queryId == UINT64CONST(0))
133  {
134  if (query->utilityStmt)
135  query->queryId = UINT64CONST(2);
136  else
137  query->queryId = UINT64CONST(1);
138  }
139 
140  return jstate;
141 }
static Datum hash_any_extended(const unsigned char *k, int keylen, uint64 seed)
Definition: hashfn.h:37
void * palloc(Size size)
Definition: mcxt.c:1316
static uint64 DatumGetUInt64(Datum X)
Definition: postgres.h:419
static bool IsQueryIdEnabled(void)
Definition: queryjumble.h:77
static void _jumbleNode(JumbleState *jstate, Node *node)
#define JUMBLE_SIZE
unsigned char * jumble
Definition: queryjumble.h:35
int clocations_buf_size
Definition: queryjumble.h:44
Size jumble_len
Definition: queryjumble.h:38
int highest_extern_param_id
Definition: queryjumble.h:50
LocationLen * clocations
Definition: queryjumble.h:41
int clocations_count
Definition: queryjumble.h:47
Definition: nodes.h:129
Node * utilityStmt
Definition: parsenodes.h:136

References _jumbleNode(), Assert, JumbleState::clocations, JumbleState::clocations_buf_size, JumbleState::clocations_count, DatumGetUInt64(), hash_any_extended(), JumbleState::highest_extern_param_id, IsQueryIdEnabled(), JumbleState::jumble, JumbleState::jumble_len, JUMBLE_SIZE, palloc(), and Query::utilityStmt.

Referenced by ExplainQuery(), parse_analyze_fixedparams(), parse_analyze_varparams(), and parse_analyze_withcb().

Variable Documentation

◆ compute_query_id

PGDLLIMPORT int compute_query_id
extern

Definition at line 43 of file queryjumblefuncs.c.

Referenced by EnableQueryId(), ExplainPrintPlan(), and IsQueryIdEnabled().

◆ query_id_enabled

PGDLLIMPORT bool query_id_enabled
extern

Definition at line 52 of file queryjumblefuncs.c.

Referenced by EnableQueryId(), and IsQueryIdEnabled().