PostgreSQL Source Code  git master
gininsert.c
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1 /*-------------------------------------------------------------------------
2  *
3  * gininsert.c
4  * insert routines for the postgres inverted index access method.
5  *
6  *
7  * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
8  * Portions Copyright (c) 1994, Regents of the University of California
9  *
10  * IDENTIFICATION
11  * src/backend/access/gin/gininsert.c
12  *-------------------------------------------------------------------------
13  */
14 
15 #include "postgres.h"
16 
17 #include "access/gin_private.h"
18 #include "access/ginxlog.h"
19 #include "access/tableam.h"
20 #include "access/xloginsert.h"
21 #include "catalog/index.h"
22 #include "miscadmin.h"
23 #include "storage/bufmgr.h"
24 #include "storage/indexfsm.h"
25 #include "storage/predicate.h"
26 #include "storage/smgr.h"
27 #include "utils/memutils.h"
28 #include "utils/rel.h"
29 
30 typedef struct
31 {
33  double indtuples;
39 
40 
41 /*
42  * Adds array of item pointers to tuple's posting list, or
43  * creates posting tree and tuple pointing to tree in case
44  * of not enough space. Max size of tuple is defined in
45  * GinFormTuple(). Returns a new, modified index tuple.
46  * items[] must be in sorted order with no duplicates.
47  */
48 static IndexTuple
50  IndexTuple old,
51  ItemPointerData *items, uint32 nitem,
52  GinStatsData *buildStats, Buffer buffer)
53 {
55  Datum key;
56  GinNullCategory category;
57  IndexTuple res;
58  ItemPointerData *newItems,
59  *oldItems;
60  int oldNPosting,
61  newNPosting;
62  GinPostingList *compressedList;
63 
64  Assert(!GinIsPostingTree(old));
65 
66  attnum = gintuple_get_attrnum(ginstate, old);
67  key = gintuple_get_key(ginstate, old, &category);
68 
69  /* merge the old and new posting lists */
70  oldItems = ginReadTuple(ginstate, attnum, old, &oldNPosting);
71 
72  newItems = ginMergeItemPointers(items, nitem,
73  oldItems, oldNPosting,
74  &newNPosting);
75 
76  /* Compress the posting list, and try to a build tuple with room for it */
77  res = NULL;
78  compressedList = ginCompressPostingList(newItems, newNPosting, GinMaxItemSize,
79  NULL);
80  pfree(newItems);
81  if (compressedList)
82  {
83  res = GinFormTuple(ginstate, attnum, key, category,
84  (char *) compressedList,
85  SizeOfGinPostingList(compressedList),
86  newNPosting,
87  false);
88  pfree(compressedList);
89  }
90  if (!res)
91  {
92  /* posting list would be too big, convert to posting tree */
93  BlockNumber postingRoot;
94 
95  /*
96  * Initialize posting tree with the old tuple's posting list. It's
97  * surely small enough to fit on one posting-tree page, and should
98  * already be in order with no duplicates.
99  */
100  postingRoot = createPostingTree(ginstate->index,
101  oldItems,
102  oldNPosting,
103  buildStats,
104  buffer);
105 
106  /* Now insert the TIDs-to-be-added into the posting tree */
107  ginInsertItemPointers(ginstate->index, postingRoot,
108  items, nitem,
109  buildStats);
110 
111  /* And build a new posting-tree-only result tuple */
112  res = GinFormTuple(ginstate, attnum, key, category, NULL, 0, 0, true);
113  GinSetPostingTree(res, postingRoot);
114  }
115  pfree(oldItems);
116 
117  return res;
118 }
119 
120 /*
121  * Build a fresh leaf tuple, either posting-list or posting-tree format
122  * depending on whether the given items list will fit.
123  * items[] must be in sorted order with no duplicates.
124  *
125  * This is basically the same logic as in addItemPointersToLeafTuple,
126  * but working from slightly different input.
127  */
128 static IndexTuple
131  ItemPointerData *items, uint32 nitem,
132  GinStatsData *buildStats, Buffer buffer)
133 {
134  IndexTuple res = NULL;
135  GinPostingList *compressedList;
136 
137  /* try to build a posting list tuple with all the items */
138  compressedList = ginCompressPostingList(items, nitem, GinMaxItemSize, NULL);
139  if (compressedList)
140  {
141  res = GinFormTuple(ginstate, attnum, key, category,
142  (char *) compressedList,
143  SizeOfGinPostingList(compressedList),
144  nitem, false);
145  pfree(compressedList);
146  }
147  if (!res)
148  {
149  /* posting list would be too big, build posting tree */
150  BlockNumber postingRoot;
151 
152  /*
153  * Build posting-tree-only result tuple. We do this first so as to
154  * fail quickly if the key is too big.
155  */
156  res = GinFormTuple(ginstate, attnum, key, category, NULL, 0, 0, true);
157 
158  /*
159  * Initialize a new posting tree with the TIDs.
160  */
161  postingRoot = createPostingTree(ginstate->index, items, nitem,
162  buildStats, buffer);
163 
164  /* And save the root link in the result tuple */
165  GinSetPostingTree(res, postingRoot);
166  }
167 
168  return res;
169 }
170 
171 /*
172  * Insert one or more heap TIDs associated with the given key value.
173  * This will either add a single key entry, or enlarge a pre-existing entry.
174  *
175  * During an index build, buildStats is non-null and the counters
176  * it contains should be incremented as needed.
177  */
178 void
181  ItemPointerData *items, uint32 nitem,
182  GinStatsData *buildStats)
183 {
184  GinBtreeData btree;
185  GinBtreeEntryInsertData insertdata;
186  GinBtreeStack *stack;
187  IndexTuple itup;
188  Page page;
189 
190  insertdata.isDelete = false;
191 
192  ginPrepareEntryScan(&btree, attnum, key, category, ginstate);
193  btree.isBuild = (buildStats != NULL);
194 
195  stack = ginFindLeafPage(&btree, false, false, NULL);
196  page = BufferGetPage(stack->buffer);
197 
198  if (btree.findItem(&btree, stack))
199  {
200  /* found pre-existing entry */
201  itup = (IndexTuple) PageGetItem(page, PageGetItemId(page, stack->off));
202 
203  if (GinIsPostingTree(itup))
204  {
205  /* add entries to existing posting tree */
206  BlockNumber rootPostingTree = GinGetPostingTree(itup);
207 
208  /* release all stack */
209  LockBuffer(stack->buffer, GIN_UNLOCK);
210  freeGinBtreeStack(stack);
211 
212  /* insert into posting tree */
213  ginInsertItemPointers(ginstate->index, rootPostingTree,
214  items, nitem,
215  buildStats);
216  return;
217  }
218 
219  CheckForSerializableConflictIn(ginstate->index, NULL,
220  BufferGetBlockNumber(stack->buffer));
221  /* modify an existing leaf entry */
222  itup = addItemPointersToLeafTuple(ginstate, itup,
223  items, nitem, buildStats, stack->buffer);
224 
225  insertdata.isDelete = true;
226  }
227  else
228  {
229  CheckForSerializableConflictIn(ginstate->index, NULL,
230  BufferGetBlockNumber(stack->buffer));
231  /* no match, so construct a new leaf entry */
232  itup = buildFreshLeafTuple(ginstate, attnum, key, category,
233  items, nitem, buildStats, stack->buffer);
234 
235  /*
236  * nEntries counts leaf tuples, so increment it only when we make a
237  * new one.
238  */
239  if (buildStats)
240  buildStats->nEntries++;
241  }
242 
243  /* Insert the new or modified leaf tuple */
244  insertdata.entry = itup;
245  ginInsertValue(&btree, stack, &insertdata, buildStats);
246  pfree(itup);
247 }
248 
249 /*
250  * Extract index entries for a single indexable item, and add them to the
251  * BuildAccumulator's state.
252  *
253  * This function is used only during initial index creation.
254  */
255 static void
257  Datum value, bool isNull,
258  ItemPointer heapptr)
259 {
260  Datum *entries;
261  GinNullCategory *categories;
262  int32 nentries;
263  MemoryContext oldCtx;
264 
265  oldCtx = MemoryContextSwitchTo(buildstate->funcCtx);
266  entries = ginExtractEntries(buildstate->accum.ginstate, attnum,
267  value, isNull,
268  &nentries, &categories);
269  MemoryContextSwitchTo(oldCtx);
270 
271  ginInsertBAEntries(&buildstate->accum, heapptr, attnum,
272  entries, categories, nentries);
273 
274  buildstate->indtuples += nentries;
275 
276  MemoryContextReset(buildstate->funcCtx);
277 }
278 
279 static void
281  bool *isnull, bool tupleIsAlive, void *state)
282 {
283  GinBuildState *buildstate = (GinBuildState *) state;
284  MemoryContext oldCtx;
285  int i;
286 
287  oldCtx = MemoryContextSwitchTo(buildstate->tmpCtx);
288 
289  for (i = 0; i < buildstate->ginstate.origTupdesc->natts; i++)
290  ginHeapTupleBulkInsert(buildstate, (OffsetNumber) (i + 1),
291  values[i], isnull[i], tid);
292 
293  /* If we've maxed out our available memory, dump everything to the index */
294  if (buildstate->accum.allocatedMemory >= (Size) maintenance_work_mem * 1024L)
295  {
297  Datum key;
298  GinNullCategory category;
299  uint32 nlist;
301 
302  ginBeginBAScan(&buildstate->accum);
303  while ((list = ginGetBAEntry(&buildstate->accum,
304  &attnum, &key, &category, &nlist)) != NULL)
305  {
306  /* there could be many entries, so be willing to abort here */
308  ginEntryInsert(&buildstate->ginstate, attnum, key, category,
309  list, nlist, &buildstate->buildStats);
310  }
311 
312  MemoryContextReset(buildstate->tmpCtx);
313  ginInitBA(&buildstate->accum);
314  }
315 
316  MemoryContextSwitchTo(oldCtx);
317 }
318 
321 {
322  IndexBuildResult *result;
323  double reltuples;
324  GinBuildState buildstate;
325  Buffer RootBuffer,
326  MetaBuffer;
328  Datum key;
329  GinNullCategory category;
330  uint32 nlist;
331  MemoryContext oldCtx;
333 
334  if (RelationGetNumberOfBlocks(index) != 0)
335  elog(ERROR, "index \"%s\" already contains data",
336  RelationGetRelationName(index));
337 
338  initGinState(&buildstate.ginstate, index);
339  buildstate.indtuples = 0;
340  memset(&buildstate.buildStats, 0, sizeof(GinStatsData));
341 
342  /* initialize the meta page */
343  MetaBuffer = GinNewBuffer(index);
344 
345  /* initialize the root page */
346  RootBuffer = GinNewBuffer(index);
347 
349  GinInitMetabuffer(MetaBuffer);
350  MarkBufferDirty(MetaBuffer);
351  GinInitBuffer(RootBuffer, GIN_LEAF);
352  MarkBufferDirty(RootBuffer);
353 
354 
355  UnlockReleaseBuffer(MetaBuffer);
356  UnlockReleaseBuffer(RootBuffer);
358 
359  /* count the root as first entry page */
360  buildstate.buildStats.nEntryPages++;
361 
362  /*
363  * create a temporary memory context that is used to hold data not yet
364  * dumped out to the index
365  */
367  "Gin build temporary context",
369 
370  /*
371  * create a temporary memory context that is used for calling
372  * ginExtractEntries(), and can be reset after each tuple
373  */
375  "Gin build temporary context for user-defined function",
377 
378  buildstate.accum.ginstate = &buildstate.ginstate;
379  ginInitBA(&buildstate.accum);
380 
381  /*
382  * Do the heap scan. We disallow sync scan here because dataPlaceToPage
383  * prefers to receive tuples in TID order.
384  */
385  reltuples = table_index_build_scan(heap, index, indexInfo, false, true,
386  ginBuildCallback, (void *) &buildstate,
387  NULL);
388 
389  /* dump remaining entries to the index */
390  oldCtx = MemoryContextSwitchTo(buildstate.tmpCtx);
391  ginBeginBAScan(&buildstate.accum);
392  while ((list = ginGetBAEntry(&buildstate.accum,
393  &attnum, &key, &category, &nlist)) != NULL)
394  {
395  /* there could be many entries, so be willing to abort here */
397  ginEntryInsert(&buildstate.ginstate, attnum, key, category,
398  list, nlist, &buildstate.buildStats);
399  }
400  MemoryContextSwitchTo(oldCtx);
401 
402  MemoryContextDelete(buildstate.funcCtx);
403  MemoryContextDelete(buildstate.tmpCtx);
404 
405  /*
406  * Update metapage stats
407  */
408  buildstate.buildStats.nTotalPages = RelationGetNumberOfBlocks(index);
409  ginUpdateStats(index, &buildstate.buildStats, true);
410 
411  /*
412  * We didn't write WAL records as we built the index, so if WAL-logging is
413  * required, write all pages to the WAL now.
414  */
415  if (RelationNeedsWAL(index))
416  {
418  0, RelationGetNumberOfBlocks(index),
419  true);
420  }
421 
422  /*
423  * Return statistics
424  */
425  result = (IndexBuildResult *) palloc(sizeof(IndexBuildResult));
426 
427  result->heap_tuples = reltuples;
428  result->index_tuples = buildstate.indtuples;
429 
430  return result;
431 }
432 
433 /*
434  * ginbuildempty() -- build an empty gin index in the initialization fork
435  */
436 void
438 {
439  Buffer RootBuffer,
440  MetaBuffer;
441 
442  /* An empty GIN index has two pages. */
443  MetaBuffer =
445  LockBuffer(MetaBuffer, BUFFER_LOCK_EXCLUSIVE);
446  RootBuffer =
448  LockBuffer(RootBuffer, BUFFER_LOCK_EXCLUSIVE);
449 
450  /* Initialize and xlog metabuffer and root buffer. */
452  GinInitMetabuffer(MetaBuffer);
453  MarkBufferDirty(MetaBuffer);
454  log_newpage_buffer(MetaBuffer, true);
455  GinInitBuffer(RootBuffer, GIN_LEAF);
456  MarkBufferDirty(RootBuffer);
457  log_newpage_buffer(RootBuffer, false);
459 
460  /* Unlock and release the buffers. */
461  UnlockReleaseBuffer(MetaBuffer);
462  UnlockReleaseBuffer(RootBuffer);
463 }
464 
465 /*
466  * Insert index entries for a single indexable item during "normal"
467  * (non-fast-update) insertion
468  */
469 static void
471  Datum value, bool isNull,
472  ItemPointer item)
473 {
474  Datum *entries;
475  GinNullCategory *categories;
476  int32 i,
477  nentries;
478 
479  entries = ginExtractEntries(ginstate, attnum, value, isNull,
480  &nentries, &categories);
481 
482  for (i = 0; i < nentries; i++)
483  ginEntryInsert(ginstate, attnum, entries[i], categories[i],
484  item, 1, NULL);
485 }
486 
487 bool
489  ItemPointer ht_ctid, Relation heapRel,
490  IndexUniqueCheck checkUnique,
491  IndexInfo *indexInfo)
492 {
493  GinState *ginstate = (GinState *) indexInfo->ii_AmCache;
494  MemoryContext oldCtx;
495  MemoryContext insertCtx;
496  int i;
497 
498  /* Initialize GinState cache if first call in this statement */
499  if (ginstate == NULL)
500  {
501  oldCtx = MemoryContextSwitchTo(indexInfo->ii_Context);
502  ginstate = (GinState *) palloc(sizeof(GinState));
503  initGinState(ginstate, index);
504  indexInfo->ii_AmCache = (void *) ginstate;
505  MemoryContextSwitchTo(oldCtx);
506  }
507 
509  "Gin insert temporary context",
511 
512  oldCtx = MemoryContextSwitchTo(insertCtx);
513 
514  if (GinGetUseFastUpdate(index))
515  {
516  GinTupleCollector collector;
517 
518  memset(&collector, 0, sizeof(GinTupleCollector));
519 
520  for (i = 0; i < ginstate->origTupdesc->natts; i++)
521  ginHeapTupleFastCollect(ginstate, &collector,
522  (OffsetNumber) (i + 1),
523  values[i], isnull[i],
524  ht_ctid);
525 
526  ginHeapTupleFastInsert(ginstate, &collector);
527  }
528  else
529  {
530  for (i = 0; i < ginstate->origTupdesc->natts; i++)
531  ginHeapTupleInsert(ginstate, (OffsetNumber) (i + 1),
532  values[i], isnull[i],
533  ht_ctid);
534  }
535 
536  MemoryContextSwitchTo(oldCtx);
537  MemoryContextDelete(insertCtx);
538 
539  return false;
540 }
#define GIN_UNLOCK
Definition: gin_private.h:48
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Definition: gin.h:46
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Buffer GinNewBuffer(Relation index)
Definition: ginutil.c:298
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Definition: ginutil.c:363
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Definition: xloginsert.c:1033
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Relation index
Definition: gin_private.h:58
OffsetNumber off
Definition: gin_private.h:131
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Definition: gininsert.c:34
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Definition: gininsert.c:437
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Definition: gininsert.c:280
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Definition: gininsert.c:33
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Definition: bufmgr.h:98
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Definition: gininsert.c:470
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Definition: gininsert.c:49
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Definition: gin_private.h:154
signed int int32
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Definition: gininsert.c:32
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Datum * ginExtractEntries(GinState *ginstate, OffsetNumber attnum, Datum value, bool isNull, int32 *nentries, GinNullCategory **categories)
Definition: ginutil.c:490
#define PageGetItem(page, itemId)
Definition: bufpage.h:340
Pointer Page
Definition: bufpage.h:78
double index_tuples
Definition: genam.h:33
double heap_tuples
Definition: genam.h:32
void ginInitBA(BuildAccumulator *accum)
Definition: ginbulk.c:109
#define GIN_LEAF
Definition: ginblock.h:42