PostgreSQL Source Code  git master
execGrouping.c File Reference
#include "postgres.h"
#include "access/parallel.h"
#include "common/hashfn.h"
#include "executor/executor.h"
#include "miscadmin.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "lib/simplehash.h"
Include dependency graph for execGrouping.c:

Go to the source code of this file.

Macros

#define SH_PREFIX   tuplehash
 
#define SH_ELEMENT_TYPE   TupleHashEntryData
 
#define SH_KEY_TYPE   MinimalTuple
 
#define SH_KEY   firstTuple
 
#define SH_HASH_KEY(tb, key)   TupleHashTableHash_internal(tb, key)
 
#define SH_EQUAL(tb, a, b)   TupleHashTableMatch(tb, a, b) == 0
 
#define SH_SCOPE   extern
 
#define SH_STORE_HASH
 
#define SH_GET_HASH(tb, a)   a->hash
 
#define SH_DEFINE
 

Functions

static int TupleHashTableMatch (struct tuplehash_hash *tb, const MinimalTuple tuple1, const MinimalTuple tuple2)
 
static uint32 TupleHashTableHash_internal (struct tuplehash_hash *tb, const MinimalTuple tuple)
 
static TupleHashEntry LookupTupleHashEntry_internal (TupleHashTable hashtable, TupleTableSlot *slot, bool *isnew, uint32 hash)
 
ExprStateexecTuplesMatchPrepare (TupleDesc desc, int numCols, const AttrNumber *keyColIdx, const Oid *eqOperators, const Oid *collations, PlanState *parent)
 
void execTuplesHashPrepare (int numCols, const Oid *eqOperators, Oid **eqFuncOids, FmgrInfo **hashFunctions)
 
TupleHashTable BuildTupleHashTableExt (PlanState *parent, TupleDesc inputDesc, int numCols, AttrNumber *keyColIdx, const Oid *eqfuncoids, FmgrInfo *hashfunctions, Oid *collations, long nbuckets, Size additionalsize, MemoryContext metacxt, MemoryContext tablecxt, MemoryContext tempcxt, bool use_variable_hash_iv)
 
TupleHashTable BuildTupleHashTable (PlanState *parent, TupleDesc inputDesc, int numCols, AttrNumber *keyColIdx, const Oid *eqfuncoids, FmgrInfo *hashfunctions, Oid *collations, long nbuckets, Size additionalsize, MemoryContext tablecxt, MemoryContext tempcxt, bool use_variable_hash_iv)
 
void ResetTupleHashTable (TupleHashTable hashtable)
 
TupleHashEntry LookupTupleHashEntry (TupleHashTable hashtable, TupleTableSlot *slot, bool *isnew)
 
uint32 TupleHashTableHash (TupleHashTable hashtable, TupleTableSlot *slot)
 
TupleHashEntry LookupTupleHashEntryHash (TupleHashTable hashtable, TupleTableSlot *slot, bool *isnew, uint32 hash)
 
TupleHashEntry FindTupleHashEntry (TupleHashTable hashtable, TupleTableSlot *slot, ExprState *eqcomp, FmgrInfo *hashfunctions)
 

Macro Definition Documentation

◆ SH_DEFINE

#define SH_DEFINE

Definition at line 45 of file execGrouping.c.

◆ SH_ELEMENT_TYPE

#define SH_ELEMENT_TYPE   TupleHashEntryData

Definition at line 37 of file execGrouping.c.

◆ SH_EQUAL

#define SH_EQUAL (   tb,
  a,
 
)    TupleHashTableMatch(tb, a, b) == 0

Definition at line 41 of file execGrouping.c.

◆ SH_GET_HASH

#define SH_GET_HASH (   tb,
 
)    a->hash

Definition at line 44 of file execGrouping.c.

◆ SH_HASH_KEY

#define SH_HASH_KEY (   tb,
  key 
)    TupleHashTableHash_internal(tb, key)

Definition at line 40 of file execGrouping.c.

◆ SH_KEY

#define SH_KEY   firstTuple

Definition at line 39 of file execGrouping.c.

◆ SH_KEY_TYPE

#define SH_KEY_TYPE   MinimalTuple

Definition at line 38 of file execGrouping.c.

◆ SH_PREFIX

#define SH_PREFIX   tuplehash

Definition at line 36 of file execGrouping.c.

◆ SH_SCOPE

#define SH_SCOPE   extern

Definition at line 42 of file execGrouping.c.

◆ SH_STORE_HASH

#define SH_STORE_HASH

Definition at line 43 of file execGrouping.c.

Function Documentation

◆ BuildTupleHashTable()

TupleHashTable BuildTupleHashTable ( PlanState parent,
TupleDesc  inputDesc,
int  numCols,
AttrNumber keyColIdx,
const Oid eqfuncoids,
FmgrInfo hashfunctions,
Oid collations,
long  nbuckets,
Size  additionalsize,
MemoryContext  tablecxt,
MemoryContext  tempcxt,
bool  use_variable_hash_iv 
)

Definition at line 252 of file execGrouping.c.

References BuildTupleHashTableExt().

262 {
263  return BuildTupleHashTableExt(parent,
264  inputDesc,
265  numCols, keyColIdx,
266  eqfuncoids,
267  hashfunctions,
268  collations,
269  nbuckets, additionalsize,
270  tablecxt,
271  tablecxt,
272  tempcxt,
273  use_variable_hash_iv);
274 }
TupleHashTable BuildTupleHashTableExt(PlanState *parent, TupleDesc inputDesc, int numCols, AttrNumber *keyColIdx, const Oid *eqfuncoids, FmgrInfo *hashfunctions, Oid *collations, long nbuckets, Size additionalsize, MemoryContext metacxt, MemoryContext tablecxt, MemoryContext tempcxt, bool use_variable_hash_iv)
Definition: execGrouping.c:154

◆ BuildTupleHashTableExt()

TupleHashTable BuildTupleHashTableExt ( PlanState parent,
TupleDesc  inputDesc,
int  numCols,
AttrNumber keyColIdx,
const Oid eqfuncoids,
FmgrInfo hashfunctions,
Oid collations,
long  nbuckets,
Size  additionalsize,
MemoryContext  metacxt,
MemoryContext  tablecxt,
MemoryContext  tempcxt,
bool  use_variable_hash_iv 
)

Definition at line 154 of file execGrouping.c.

References Assert, CreateStandaloneExprContext(), CreateTupleDescCopy(), TupleHashTableData::cur_eq_func, TupleHashTableData::entrysize, ExecBuildGroupingEqual(), TupleHashTableData::exprcontext, TupleHashTableData::hash_iv, TupleHashTableData::hashtab, TupleHashTableData::in_hash_funcs, TupleHashTableData::inputslot, TupleHashTableData::keyColIdx, MakeSingleTupleTableSlot(), MemoryContextSwitchTo(), Min, murmurhash32(), TupleHashTableData::numCols, palloc(), ParallelWorkerNumber, TupleHashTableData::tab_collations, TupleHashTableData::tab_eq_func, TupleHashTableData::tab_hash_funcs, TupleHashTableData::tablecxt, TupleHashTableData::tableslot, TupleHashTableData::tempcxt, TTSOpsMinimalTuple, and work_mem.

Referenced by build_hash_table(), buildSubPlanHash(), and BuildTupleHashTable().

165 {
166  TupleHashTable hashtable;
167  Size entrysize = sizeof(TupleHashEntryData) + additionalsize;
168  MemoryContext oldcontext;
169  bool allow_jit;
170 
171  Assert(nbuckets > 0);
172 
173  /* Limit initial table size request to not more than work_mem */
174  nbuckets = Min(nbuckets, (long) ((work_mem * 1024L) / entrysize));
175 
176  oldcontext = MemoryContextSwitchTo(metacxt);
177 
178  hashtable = (TupleHashTable) palloc(sizeof(TupleHashTableData));
179 
180  hashtable->numCols = numCols;
181  hashtable->keyColIdx = keyColIdx;
182  hashtable->tab_hash_funcs = hashfunctions;
183  hashtable->tab_collations = collations;
184  hashtable->tablecxt = tablecxt;
185  hashtable->tempcxt = tempcxt;
186  hashtable->entrysize = entrysize;
187  hashtable->tableslot = NULL; /* will be made on first lookup */
188  hashtable->inputslot = NULL;
189  hashtable->in_hash_funcs = NULL;
190  hashtable->cur_eq_func = NULL;
191 
192  /*
193  * If parallelism is in use, even if the master backend is performing the
194  * scan itself, we don't want to create the hashtable exactly the same way
195  * in all workers. As hashtables are iterated over in keyspace-order,
196  * doing so in all processes in the same way is likely to lead to
197  * "unbalanced" hashtables when the table size initially is
198  * underestimated.
199  */
200  if (use_variable_hash_iv)
202  else
203  hashtable->hash_iv = 0;
204 
205  hashtable->hashtab = tuplehash_create(metacxt, nbuckets, hashtable);
206 
207  /*
208  * We copy the input tuple descriptor just for safety --- we assume all
209  * input tuples will have equivalent descriptors.
210  */
213 
214  /*
215  * If the old reset interface is used (i.e. BuildTupleHashTable, rather
216  * than BuildTupleHashTableExt), allowing JIT would lead to the generated
217  * functions to a) live longer than the query b) be re-generated each time
218  * the table is being reset. Therefore prevent JIT from being used in that
219  * case, by not providing a parent node (which prevents accessing the
220  * JitContext in the EState).
221  */
222  allow_jit = metacxt != tablecxt;
223 
224  /* build comparator for all columns */
225  /* XXX: should we support non-minimal tuples for the inputslot? */
226  hashtable->tab_eq_func = ExecBuildGroupingEqual(inputDesc, inputDesc,
228  numCols,
229  keyColIdx, eqfuncoids, collations,
230  allow_jit ? parent : NULL);
231 
232  /*
233  * While not pretty, it's ok to not shut down this context, but instead
234  * rely on the containing memory context being reset, as
235  * ExecBuildGroupingEqual() only builds a very simple expression calling
236  * functions (i.e. nothing that'd employ RegisterExprContextCallback()).
237  */
239 
240  MemoryContextSwitchTo(oldcontext);
241 
242  return hashtable;
243 }
ExprContext * exprcontext
Definition: execnodes.h:713
ExprContext * CreateStandaloneExprContext(void)
Definition: execUtils.c:357
TupleDesc CreateTupleDescCopy(TupleDesc tupdesc)
Definition: tupdesc.c:110
TupleTableSlot * MakeSingleTupleTableSlot(TupleDesc tupdesc, const TupleTableSlotOps *tts_ops)
Definition: execTuples.c:1208
ExprState * ExecBuildGroupingEqual(TupleDesc ldesc, TupleDesc rdesc, const TupleTableSlotOps *lops, const TupleTableSlotOps *rops, int numCols, const AttrNumber *keyColIdx, const Oid *eqfunctions, const Oid *collations, PlanState *parent)
Definition: execExpr.c:3350
TupleTableSlot * inputslot
Definition: execnodes.h:709
#define Min(x, y)
Definition: c.h:920
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
AttrNumber * keyColIdx
Definition: execnodes.h:700
ExprState * tab_eq_func
Definition: execnodes.h:702
ExprState * cur_eq_func
Definition: execnodes.h:711
static uint32 murmurhash32(uint32 data)
Definition: hashfn.h:92
FmgrInfo * tab_hash_funcs
Definition: execnodes.h:701
FmgrInfo * in_hash_funcs
Definition: execnodes.h:710
struct TupleHashEntryData TupleHashEntryData
MemoryContext tablecxt
Definition: execnodes.h:704
struct TupleHashTableData * TupleHashTable
Definition: execnodes.h:678
int ParallelWorkerNumber
Definition: parallel.c:112
int work_mem
Definition: globals.c:121
tuplehash_hash * hashtab
Definition: execnodes.h:698
#define Assert(condition)
Definition: c.h:738
TupleTableSlot * tableslot
Definition: execnodes.h:707
size_t Size
Definition: c.h:466
void * palloc(Size size)
Definition: mcxt.c:949
MemoryContext tempcxt
Definition: execnodes.h:705
const TupleTableSlotOps TTSOpsMinimalTuple
Definition: execTuples.c:85

◆ execTuplesHashPrepare()

void execTuplesHashPrepare ( int  numCols,
const Oid eqOperators,
Oid **  eqFuncOids,
FmgrInfo **  hashFunctions 
)

Definition at line 96 of file execGrouping.c.

References Assert, elog, ERROR, fmgr_info(), get_op_hash_functions(), get_opcode(), i, and palloc().

Referenced by ExecInitRecursiveUnion(), ExecInitSetOp(), and find_hash_columns().

100 {
101  int i;
102 
103  *eqFuncOids = (Oid *) palloc(numCols * sizeof(Oid));
104  *hashFunctions = (FmgrInfo *) palloc(numCols * sizeof(FmgrInfo));
105 
106  for (i = 0; i < numCols; i++)
107  {
108  Oid eq_opr = eqOperators[i];
109  Oid eq_function;
110  Oid left_hash_function;
111  Oid right_hash_function;
112 
113  eq_function = get_opcode(eq_opr);
114  if (!get_op_hash_functions(eq_opr,
115  &left_hash_function, &right_hash_function))
116  elog(ERROR, "could not find hash function for hash operator %u",
117  eq_opr);
118  /* We're not supporting cross-type cases here */
119  Assert(left_hash_function == right_hash_function);
120  (*eqFuncOids)[i] = eq_function;
121  fmgr_info(right_hash_function, &(*hashFunctions)[i]);
122  }
123 }
Definition: fmgr.h:56
bool get_op_hash_functions(Oid opno, RegProcedure *lhs_procno, RegProcedure *rhs_procno)
Definition: lsyscache.c:508
unsigned int Oid
Definition: postgres_ext.h:31
#define ERROR
Definition: elog.h:43
void fmgr_info(Oid functionId, FmgrInfo *finfo)
Definition: fmgr.c:126
RegProcedure get_opcode(Oid opno)
Definition: lsyscache.c:1202
#define Assert(condition)
Definition: c.h:738
void * palloc(Size size)
Definition: mcxt.c:949
#define elog(elevel,...)
Definition: elog.h:214
int i

◆ execTuplesMatchPrepare()

ExprState* execTuplesMatchPrepare ( TupleDesc  desc,
int  numCols,
const AttrNumber keyColIdx,
const Oid eqOperators,
const Oid collations,
PlanState parent 
)

Definition at line 59 of file execGrouping.c.

References ExecBuildGroupingEqual(), get_opcode(), i, and palloc().

Referenced by build_pertrans_for_aggref(), ExecInitAgg(), ExecInitGroup(), ExecInitLimit(), ExecInitSetOp(), ExecInitUnique(), ExecInitWindowAgg(), and hypothetical_dense_rank_final().

65 {
66  Oid *eqFunctions = (Oid *) palloc(numCols * sizeof(Oid));
67  int i;
68  ExprState *expr;
69 
70  if (numCols == 0)
71  return NULL;
72 
73  /* lookup equality functions */
74  for (i = 0; i < numCols; i++)
75  eqFunctions[i] = get_opcode(eqOperators[i]);
76 
77  /* build actual expression */
78  expr = ExecBuildGroupingEqual(desc, desc, NULL, NULL,
79  numCols, keyColIdx, eqFunctions, collations,
80  parent);
81 
82  return expr;
83 }
ExprState * ExecBuildGroupingEqual(TupleDesc ldesc, TupleDesc rdesc, const TupleTableSlotOps *lops, const TupleTableSlotOps *rops, int numCols, const AttrNumber *keyColIdx, const Oid *eqfunctions, const Oid *collations, PlanState *parent)
Definition: execExpr.c:3350
unsigned int Oid
Definition: postgres_ext.h:31
RegProcedure get_opcode(Oid opno)
Definition: lsyscache.c:1202
void * palloc(Size size)
Definition: mcxt.c:949
int i

◆ FindTupleHashEntry()

TupleHashEntry FindTupleHashEntry ( TupleHashTable  hashtable,
TupleTableSlot slot,
ExprState eqcomp,
FmgrInfo hashfunctions 
)

Definition at line 381 of file execGrouping.c.

References TupleHashTableData::cur_eq_func, TupleHashTableData::hashtab, TupleHashTableData::in_hash_funcs, TupleHashTableData::inputslot, sort-test::key, MemoryContextSwitchTo(), and TupleHashTableData::tempcxt.

Referenced by ExecHashSubPlan().

384 {
385  TupleHashEntry entry;
386  MemoryContext oldContext;
388 
389  /* Need to run the hash functions in short-lived context */
390  oldContext = MemoryContextSwitchTo(hashtable->tempcxt);
391 
392  /* Set up data needed by hash and match functions */
393  hashtable->inputslot = slot;
394  hashtable->in_hash_funcs = hashfunctions;
395  hashtable->cur_eq_func = eqcomp;
396 
397  /* Search the hash table */
398  key = NULL; /* flag to reference inputslot */
399  entry = tuplehash_lookup(hashtable->hashtab, key);
400  MemoryContextSwitchTo(oldContext);
401 
402  return entry;
403 }
TupleTableSlot * inputslot
Definition: execnodes.h:709
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
ExprState * cur_eq_func
Definition: execnodes.h:711
FmgrInfo * in_hash_funcs
Definition: execnodes.h:710
tuplehash_hash * hashtab
Definition: execnodes.h:698
MemoryContext tempcxt
Definition: execnodes.h:705

◆ LookupTupleHashEntry()

TupleHashEntry LookupTupleHashEntry ( TupleHashTable  hashtable,
TupleTableSlot slot,
bool isnew 
)

Definition at line 300 of file execGrouping.c.

References TupleHashTableData::cur_eq_func, hash(), TupleHashTableData::hashtab, TupleHashTableData::in_hash_funcs, TupleHashTableData::inputslot, LookupTupleHashEntry_internal(), MemoryContextSwitchTo(), TupleHashTableData::tab_eq_func, TupleHashTableData::tab_hash_funcs, TupleHashTableData::tempcxt, and TupleHashTableHash_internal().

Referenced by buildSubPlanHash(), ExecRecursiveUnion(), and setop_fill_hash_table().

302 {
303  TupleHashEntry entry;
304  MemoryContext oldContext;
305  uint32 hash;
306 
307  /* Need to run the hash functions in short-lived context */
308  oldContext = MemoryContextSwitchTo(hashtable->tempcxt);
309 
310  /* set up data needed by hash and match functions */
311  hashtable->inputslot = slot;
312  hashtable->in_hash_funcs = hashtable->tab_hash_funcs;
313  hashtable->cur_eq_func = hashtable->tab_eq_func;
314 
315  hash = TupleHashTableHash_internal(hashtable->hashtab, NULL);
316  entry = LookupTupleHashEntry_internal(hashtable, slot, isnew, hash);
317 
318  MemoryContextSwitchTo(oldContext);
319 
320  return entry;
321 }
TupleTableSlot * inputslot
Definition: execnodes.h:709
static uint32 TupleHashTableHash_internal(struct tuplehash_hash *tb, const MinimalTuple tuple)
Definition: execGrouping.c:414
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
ExprState * tab_eq_func
Definition: execnodes.h:702
ExprState * cur_eq_func
Definition: execnodes.h:711
FmgrInfo * tab_hash_funcs
Definition: execnodes.h:701
FmgrInfo * in_hash_funcs
Definition: execnodes.h:710
static TupleHashEntry LookupTupleHashEntry_internal(TupleHashTable hashtable, TupleTableSlot *slot, bool *isnew, uint32 hash)
Definition: execGrouping.c:484
unsigned int uint32
Definition: c.h:367
tuplehash_hash * hashtab
Definition: execnodes.h:698
MemoryContext tempcxt
Definition: execnodes.h:705
static unsigned hash(unsigned *uv, int n)
Definition: rege_dfa.c:541

◆ LookupTupleHashEntry_internal()

static TupleHashEntry LookupTupleHashEntry_internal ( TupleHashTable  hashtable,
TupleTableSlot slot,
bool isnew,
uint32  hash 
)
static

Definition at line 484 of file execGrouping.c.

References TupleHashEntryData::additional, ExecCopySlotMinimalTuple(), TupleHashEntryData::firstTuple, TupleHashTableData::hashtab, sort-test::key, MemoryContextSwitchTo(), and TupleHashTableData::tablecxt.

Referenced by LookupTupleHashEntry(), and LookupTupleHashEntryHash().

486 {
487  TupleHashEntryData *entry;
488  bool found;
490 
491  key = NULL; /* flag to reference inputslot */
492 
493  if (isnew)
494  {
495  entry = tuplehash_insert_hash(hashtable->hashtab, key, hash, &found);
496 
497  if (found)
498  {
499  /* found pre-existing entry */
500  *isnew = false;
501  }
502  else
503  {
504  /* created new entry */
505  *isnew = true;
506  /* zero caller data */
507  entry->additional = NULL;
508  MemoryContextSwitchTo(hashtable->tablecxt);
509  /* Copy the first tuple into the table context */
510  entry->firstTuple = ExecCopySlotMinimalTuple(slot);
511  }
512  }
513  else
514  {
515  entry = tuplehash_lookup_hash(hashtable->hashtab, key, hash);
516  }
517 
518  return entry;
519 }
MinimalTuple firstTuple
Definition: execnodes.h:682
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
static MinimalTuple ExecCopySlotMinimalTuple(TupleTableSlot *slot)
Definition: tuptable.h:463
MemoryContext tablecxt
Definition: execnodes.h:704
tuplehash_hash * hashtab
Definition: execnodes.h:698
static unsigned hash(unsigned *uv, int n)
Definition: rege_dfa.c:541

◆ LookupTupleHashEntryHash()

TupleHashEntry LookupTupleHashEntryHash ( TupleHashTable  hashtable,
TupleTableSlot slot,
bool isnew,
uint32  hash 
)

Definition at line 350 of file execGrouping.c.

References TupleHashTableData::cur_eq_func, TupleHashTableData::in_hash_funcs, TupleHashTableData::inputslot, LookupTupleHashEntry_internal(), MemoryContextSwitchTo(), TupleHashTableData::tab_eq_func, TupleHashTableData::tab_hash_funcs, and TupleHashTableData::tempcxt.

Referenced by lookup_hash_entry().

352 {
353  TupleHashEntry entry;
354  MemoryContext oldContext;
355 
356  /* Need to run the hash functions in short-lived context */
357  oldContext = MemoryContextSwitchTo(hashtable->tempcxt);
358 
359  /* set up data needed by hash and match functions */
360  hashtable->inputslot = slot;
361  hashtable->in_hash_funcs = hashtable->tab_hash_funcs;
362  hashtable->cur_eq_func = hashtable->tab_eq_func;
363 
364  entry = LookupTupleHashEntry_internal(hashtable, slot, isnew, hash);
365 
366  MemoryContextSwitchTo(oldContext);
367 
368  return entry;
369 }
TupleTableSlot * inputslot
Definition: execnodes.h:709
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
ExprState * tab_eq_func
Definition: execnodes.h:702
ExprState * cur_eq_func
Definition: execnodes.h:711
FmgrInfo * tab_hash_funcs
Definition: execnodes.h:701
FmgrInfo * in_hash_funcs
Definition: execnodes.h:710
static TupleHashEntry LookupTupleHashEntry_internal(TupleHashTable hashtable, TupleTableSlot *slot, bool *isnew, uint32 hash)
Definition: execGrouping.c:484
MemoryContext tempcxt
Definition: execnodes.h:705
static unsigned hash(unsigned *uv, int n)
Definition: rege_dfa.c:541

◆ ResetTupleHashTable()

void ResetTupleHashTable ( TupleHashTable  hashtable)

Definition at line 282 of file execGrouping.c.

References TupleHashTableData::hashtab.

Referenced by agg_refill_hash_table(), build_hash_tables(), buildSubPlanHash(), ExecReScanRecursiveUnion(), and ExecReScanSetOp().

283 {
284  tuplehash_reset(hashtable->hashtab);
285 }
tuplehash_hash * hashtab
Definition: execnodes.h:698

◆ TupleHashTableHash()

uint32 TupleHashTableHash ( TupleHashTable  hashtable,
TupleTableSlot slot 
)

Definition at line 327 of file execGrouping.c.

References hash(), TupleHashTableData::hashtab, TupleHashTableData::in_hash_funcs, TupleHashTableData::inputslot, MemoryContextSwitchTo(), TupleHashTableData::tab_hash_funcs, TupleHashTableData::tempcxt, and TupleHashTableHash_internal().

Referenced by lookup_hash_entries().

328 {
329  MemoryContext oldContext;
330  uint32 hash;
331 
332  hashtable->inputslot = slot;
333  hashtable->in_hash_funcs = hashtable->tab_hash_funcs;
334 
335  /* Need to run the hash functions in short-lived context */
336  oldContext = MemoryContextSwitchTo(hashtable->tempcxt);
337 
338  hash = TupleHashTableHash_internal(hashtable->hashtab, NULL);
339 
340  MemoryContextSwitchTo(oldContext);
341 
342  return hash;
343 }
TupleTableSlot * inputslot
Definition: execnodes.h:709
static uint32 TupleHashTableHash_internal(struct tuplehash_hash *tb, const MinimalTuple tuple)
Definition: execGrouping.c:414
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
FmgrInfo * tab_hash_funcs
Definition: execnodes.h:701
FmgrInfo * in_hash_funcs
Definition: execnodes.h:710
unsigned int uint32
Definition: c.h:367
tuplehash_hash * hashtab
Definition: execnodes.h:698
MemoryContext tempcxt
Definition: execnodes.h:705
static unsigned hash(unsigned *uv, int n)
Definition: rege_dfa.c:541

◆ TupleHashTableHash_internal()

static uint32 TupleHashTableHash_internal ( struct tuplehash_hash *  tb,
const MinimalTuple  tuple 
)
static

Definition at line 414 of file execGrouping.c.

References DatumGetUInt32, ExecStoreMinimalTuple(), FunctionCall1Coll(), TupleHashTableData::hash_iv, i, TupleHashTableData::in_hash_funcs, TupleHashTableData::inputslot, TupleHashTableData::keyColIdx, murmurhash32(), TupleHashTableData::numCols, slot_getattr(), TupleHashTableData::tab_collations, TupleHashTableData::tab_hash_funcs, and TupleHashTableData::tableslot.

Referenced by LookupTupleHashEntry(), and TupleHashTableHash().

416 {
417  TupleHashTable hashtable = (TupleHashTable) tb->private_data;
418  int numCols = hashtable->numCols;
419  AttrNumber *keyColIdx = hashtable->keyColIdx;
420  uint32 hashkey = hashtable->hash_iv;
421  TupleTableSlot *slot;
422  FmgrInfo *hashfunctions;
423  int i;
424 
425  if (tuple == NULL)
426  {
427  /* Process the current input tuple for the table */
428  slot = hashtable->inputslot;
429  hashfunctions = hashtable->in_hash_funcs;
430  }
431  else
432  {
433  /*
434  * Process a tuple already stored in the table.
435  *
436  * (this case never actually occurs due to the way simplehash.h is
437  * used, as the hash-value is stored in the entries)
438  */
439  slot = hashtable->tableslot;
440  ExecStoreMinimalTuple(tuple, slot, false);
441  hashfunctions = hashtable->tab_hash_funcs;
442  }
443 
444  for (i = 0; i < numCols; i++)
445  {
446  AttrNumber att = keyColIdx[i];
447  Datum attr;
448  bool isNull;
449 
450  /* rotate hashkey left 1 bit at each step */
451  hashkey = (hashkey << 1) | ((hashkey & 0x80000000) ? 1 : 0);
452 
453  attr = slot_getattr(slot, att, &isNull);
454 
455  if (!isNull) /* treat nulls as having hash key 0 */
456  {
457  uint32 hkey;
458 
459  hkey = DatumGetUInt32(FunctionCall1Coll(&hashfunctions[i],
460  hashtable->tab_collations[i],
461  attr));
462  hashkey ^= hkey;
463  }
464  }
465 
466  /*
467  * The way hashes are combined above, among each other and with the IV,
468  * doesn't lead to good bit perturbation. As the IV's goal is to lead to
469  * achieve that, perform a round of hashing of the combined hash -
470  * resulting in near perfect perturbation.
471  */
472  return murmurhash32(hashkey);
473 }
#define DatumGetUInt32(X)
Definition: postgres.h:486
Definition: fmgr.h:56
TupleTableSlot * ExecStoreMinimalTuple(MinimalTuple mtup, TupleTableSlot *slot, bool shouldFree)
Definition: execTuples.c:1416
TupleTableSlot * inputslot
Definition: execnodes.h:709
AttrNumber * keyColIdx
Definition: execnodes.h:700
static uint32 murmurhash32(uint32 data)
Definition: hashfn.h:92
FmgrInfo * tab_hash_funcs
Definition: execnodes.h:701
FmgrInfo * in_hash_funcs
Definition: execnodes.h:710
struct TupleHashTableData * TupleHashTable
Definition: execnodes.h:678
unsigned int uint32
Definition: c.h:367
uintptr_t Datum
Definition: postgres.h:367
Datum FunctionCall1Coll(FmgrInfo *flinfo, Oid collation, Datum arg1)
Definition: fmgr.c:1132
static Datum slot_getattr(TupleTableSlot *slot, int attnum, bool *isnull)
Definition: tuptable.h:381
TupleTableSlot * tableslot
Definition: execnodes.h:707
int i
int16 AttrNumber
Definition: attnum.h:21

◆ TupleHashTableMatch()

static int TupleHashTableMatch ( struct tuplehash_hash *  tb,
const MinimalTuple  tuple1,
const MinimalTuple  tuple2 
)
static

Definition at line 525 of file execGrouping.c.

References Assert, TupleHashTableData::cur_eq_func, ExecQualAndReset(), ExecStoreMinimalTuple(), TupleHashTableData::exprcontext, TupleHashTableData::inputslot, and TupleHashTableData::tableslot.

526 {
527  TupleTableSlot *slot1;
528  TupleTableSlot *slot2;
529  TupleHashTable hashtable = (TupleHashTable) tb->private_data;
530  ExprContext *econtext = hashtable->exprcontext;
531 
532  /*
533  * We assume that simplehash.h will only ever call us with the first
534  * argument being an actual table entry, and the second argument being
535  * LookupTupleHashEntry's dummy TupleHashEntryData. The other direction
536  * could be supported too, but is not currently required.
537  */
538  Assert(tuple1 != NULL);
539  slot1 = hashtable->tableslot;
540  ExecStoreMinimalTuple(tuple1, slot1, false);
541  Assert(tuple2 == NULL);
542  slot2 = hashtable->inputslot;
543 
544  /* For crosstype comparisons, the inputslot must be first */
545  econtext->ecxt_innertuple = slot2;
546  econtext->ecxt_outertuple = slot1;
547  return !ExecQualAndReset(hashtable->cur_eq_func, econtext);
548 }
ExprContext * exprcontext
Definition: execnodes.h:713
TupleTableSlot * ExecStoreMinimalTuple(MinimalTuple mtup, TupleTableSlot *slot, bool shouldFree)
Definition: execTuples.c:1416
TupleTableSlot * inputslot
Definition: execnodes.h:709
ExprState * cur_eq_func
Definition: execnodes.h:711
struct TupleHashTableData * TupleHashTable
Definition: execnodes.h:678
static bool ExecQualAndReset(ExprState *state, ExprContext *econtext)
Definition: executor.h:397
#define Assert(condition)
Definition: c.h:738
TupleTableSlot * tableslot
Definition: execnodes.h:707