Remove the no-longer-useful HashItem/HashItemData level of structure.

Same motivation as for BTItem.

src/backend/access/hash/hash.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/hash/hash.c,v 1.82 2005/11/06 19:29:00 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/hash/hash.c,v 1.83 2006/01/25 23:26:11 tgl Exp $
  *
  * NOTES
  *	  This file contains only the public interface routines.
@@ -91,7 +91,6 @@ hashbuildCallback(Relation index,
 {
 	HashBuildState *buildstate = (HashBuildState *) state;
 	IndexTuple	itup;
-	HashItem	hitem;
 
 	/* form an index tuple and point it at the heap tuple */
 	itup = index_form_tuple(RelationGetDescr(index), values, isnull);
@@ -104,13 +103,10 @@ hashbuildCallback(Relation index,
 		return;
 	}
 
-	hitem = _hash_formitem(itup);
-
-	_hash_doinsert(index, hitem);
+	_hash_doinsert(index, itup);
 
 	buildstate->indtuples += 1;
 
-	pfree(hitem);
 	pfree(itup);
 }
 
@@ -132,7 +128,6 @@ hashinsert(PG_FUNCTION_ARGS)
 	Relation	heapRel = (Relation) PG_GETARG_POINTER(4);
 	bool		checkUnique = PG_GETARG_BOOL(5);
 #endif
-	HashItem	hitem;
 	IndexTuple	itup;
 
 	/* generate an index tuple */
@@ -154,11 +149,8 @@ hashinsert(PG_FUNCTION_ARGS)
 		PG_RETURN_BOOL(false);
 	}
 
-	hitem = _hash_formitem(itup);
-
-	_hash_doinsert(rel, hitem);
+	_hash_doinsert(rel, itup);
 
-	pfree(hitem);
 	pfree(itup);
 
 	PG_RETURN_BOOL(true);
@@ -565,12 +557,12 @@ loop_top:
 			maxoffno = PageGetMaxOffsetNumber(page);
 			while (offno <= maxoffno)
 			{
-				HashItem	hitem;
+				IndexTuple	itup;
 				ItemPointer htup;
 
-				hitem = (HashItem) PageGetItem(page,
-											   PageGetItemId(page, offno));
-				htup = &(hitem->hash_itup.t_tid);
+				itup = (IndexTuple) PageGetItem(page,
+												PageGetItemId(page, offno));
+				htup = &(itup->t_tid);
 				if (callback(htup, callback_state))
 				{
 					/* delete the item from the page */

src/backend/access/hash/hashinsert.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/hash/hashinsert.c,v 1.40 2005/11/06 19:29:00 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/hash/hashinsert.c,v 1.41 2006/01/25 23:26:11 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -20,23 +20,21 @@
 
 
 static OffsetNumber _hash_pgaddtup(Relation rel, Buffer buf,
-			   Size itemsize, HashItem hitem);
+			   Size itemsize, IndexTuple itup);
 
 
 /*
- *	_hash_doinsert() -- Handle insertion of a single HashItem in the table.
+ *	_hash_doinsert() -- Handle insertion of a single index tuple.
  *
  *		This routine is called by the public interface routines, hashbuild
- *		and hashinsert.  By here, hashitem is completely filled in.
- *		The datum to be used as a "key" is in the hashitem.
+ *		and hashinsert.  By here, itup is completely filled in.
  */
 void
-_hash_doinsert(Relation rel, HashItem hitem)
+_hash_doinsert(Relation rel, IndexTuple itup)
 {
 	Buffer		buf;
 	Buffer		metabuf;
 	HashMetaPage metap;
-	IndexTuple	itup;
 	BlockNumber blkno;
 	Page		page;
 	HashPageOpaque pageopaque;
@@ -51,7 +49,6 @@ _hash_doinsert(Relation rel, HashItem hitem)
 	 * Compute the hash key for the item.  We do this first so as not to need
 	 * to hold any locks while running the hash function.
 	 */
-	itup = &(hitem->hash_itup);
 	if (rel->rd_rel->relnatts != 1)
 		elog(ERROR, "hash indexes support only one index key");
 	datum = index_getattr(itup, 1, RelationGetDescr(rel), &isnull);
@@ -59,9 +56,7 @@ _hash_doinsert(Relation rel, HashItem hitem)
 	hashkey = _hash_datum2hashkey(rel, datum);
 
 	/* compute item size too */
-	itemsz = IndexTupleDSize(hitem->hash_itup)
-		+ (sizeof(HashItemData) - sizeof(IndexTupleData));
-
+	itemsz = IndexTupleDSize(*itup);
 	itemsz = MAXALIGN(itemsz);	/* be safe, PageAddItem will do this but we
 								 * need to be consistent */
 
@@ -157,7 +152,7 @@ _hash_doinsert(Relation rel, HashItem hitem)
 	}
 
 	/* found page with enough space, so add the item here */
-	(void) _hash_pgaddtup(rel, buf, itemsz, hitem);
+	(void) _hash_pgaddtup(rel, buf, itemsz, itup);
 
 	/* write and release the modified page */
 	_hash_wrtbuf(rel, buf);
@@ -199,7 +194,7 @@ static OffsetNumber
 _hash_pgaddtup(Relation rel,
 			   Buffer buf,
 			   Size itemsize,
-			   HashItem hitem)
+			   IndexTuple itup)
 {
 	OffsetNumber itup_off;
 	Page		page;
@@ -208,7 +203,7 @@ _hash_pgaddtup(Relation rel,
 	page = BufferGetPage(buf);
 
 	itup_off = OffsetNumberNext(PageGetMaxOffsetNumber(page));
-	if (PageAddItem(page, (Item) hitem, itemsize, itup_off, LP_USED)
+	if (PageAddItem(page, (Item) itup, itemsize, itup_off, LP_USED)
 		== InvalidOffsetNumber)
 		elog(ERROR, "failed to add index item to \"%s\"",
 			 RelationGetRelationName(rel));

src/backend/access/hash/hashovfl.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/hash/hashovfl.c,v 1.49 2005/11/22 18:17:05 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/hash/hashovfl.c,v 1.50 2006/01/25 23:26:11 tgl Exp $
  *
  * NOTES
  *	  Overflow pages look like ordinary relation pages.
@@ -561,7 +561,7 @@ _hash_squeezebucket(Relation rel,
 	HashPageOpaque ropaque;
 	OffsetNumber woffnum;
 	OffsetNumber roffnum;
-	HashItem	hitem;
+	IndexTuple	itup;
 	Size		itemsz;
 
 	/*
@@ -608,10 +608,9 @@ _hash_squeezebucket(Relation rel,
 		/* this test is needed in case page is empty on entry */
 		if (roffnum <= PageGetMaxOffsetNumber(rpage))
 		{
-			hitem = (HashItem) PageGetItem(rpage,
-										   PageGetItemId(rpage, roffnum));
-			itemsz = IndexTupleDSize(hitem->hash_itup)
-				+ (sizeof(HashItemData) - sizeof(IndexTupleData));
+			itup = (IndexTuple) PageGetItem(rpage,
+											PageGetItemId(rpage, roffnum));
+			itemsz = IndexTupleDSize(*itup);
 			itemsz = MAXALIGN(itemsz);
 
 			/*
@@ -645,7 +644,7 @@ _hash_squeezebucket(Relation rel,
 			 * we have found room so insert on the "write" page.
 			 */
 			woffnum = OffsetNumberNext(PageGetMaxOffsetNumber(wpage));
-			if (PageAddItem(wpage, (Item) hitem, itemsz, woffnum, LP_USED)
+			if (PageAddItem(wpage, (Item) itup, itemsz, woffnum, LP_USED)
 				== InvalidOffsetNumber)
 				elog(ERROR, "failed to add index item to \"%s\"",
 					 RelationGetRelationName(rel));

src/backend/access/hash/hashpage.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/hash/hashpage.c,v 1.54 2005/11/22 18:17:05 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/hash/hashpage.c,v 1.55 2006/01/25 23:26:11 tgl Exp $
  *
  * NOTES
  *	  Postgres hash pages look like ordinary relation pages.  The opaque
@@ -249,7 +249,7 @@ _hash_metapinit(Relation rel)
 	 */
 	data_width = get_typavgwidth(RelationGetDescr(rel)->attrs[0]->atttypid,
 								 RelationGetDescr(rel)->attrs[0]->atttypmod);
-	item_width = MAXALIGN(sizeof(HashItemData)) + MAXALIGN(data_width) +
+	item_width = MAXALIGN(sizeof(IndexTupleData)) + MAXALIGN(data_width) +
 		sizeof(ItemIdData);		/* include the line pointer */
 	ffactor = (BLCKSZ * 3 / 4) / item_width;
 	/* keep to a sane range */
@@ -539,7 +539,6 @@ _hash_splitbucket(Relation rel,
 	BlockNumber nblkno;
 	bool		null;
 	Datum		datum;
-	HashItem	hitem;
 	HashPageOpaque oopaque;
 	HashPageOpaque nopaque;
 	IndexTuple	itup;
@@ -618,8 +617,7 @@ _hash_splitbucket(Relation rel,
 		 * It is annoying to call the hash function while holding locks, but
 		 * releasing and relocking the page for each tuple is unappealing too.
 		 */
-		hitem = (HashItem) PageGetItem(opage, PageGetItemId(opage, ooffnum));
-		itup = &(hitem->hash_itup);
+		itup = (IndexTuple) PageGetItem(opage, PageGetItemId(opage, ooffnum));
 		datum = index_getattr(itup, 1, itupdesc, &null);
 		Assert(!null);
 
@@ -633,9 +631,7 @@ _hash_splitbucket(Relation rel,
 			 * current page in the new bucket, we must allocate a new overflow
 			 * page and place the tuple on that page instead.
 			 */
-			itemsz = IndexTupleDSize(hitem->hash_itup)
-				+ (sizeof(HashItemData) - sizeof(IndexTupleData));
-
+			itemsz = IndexTupleDSize(*itup);
 			itemsz = MAXALIGN(itemsz);
 
 			if (PageGetFreeSpace(npage) < itemsz)
@@ -650,7 +646,7 @@ _hash_splitbucket(Relation rel,
 			}
 
 			noffnum = OffsetNumberNext(PageGetMaxOffsetNumber(npage));
-			if (PageAddItem(npage, (Item) hitem, itemsz, noffnum, LP_USED)
+			if (PageAddItem(npage, (Item) itup, itemsz, noffnum, LP_USED)
 				== InvalidOffsetNumber)
 				elog(ERROR, "failed to add index item to \"%s\"",
 					 RelationGetRelationName(rel));

src/backend/access/hash/hashsearch.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/hash/hashsearch.c,v 1.42 2005/11/06 19:29:00 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/hash/hashsearch.c,v 1.43 2006/01/25 23:26:11 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -37,7 +37,6 @@ _hash_next(IndexScanDesc scan, ScanDirection dir)
 	Page		page;
 	OffsetNumber offnum;
 	ItemPointer current;
-	HashItem	hitem;
 	IndexTuple	itup;
 
 	/* we still have the buffer pinned and read-locked */
@@ -55,8 +54,7 @@ _hash_next(IndexScanDesc scan, ScanDirection dir)
 	offnum = ItemPointerGetOffsetNumber(current);
 	_hash_checkpage(rel, buf, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
 	page = BufferGetPage(buf);
-	hitem = (HashItem) PageGetItem(page, PageGetItemId(page, offnum));
-	itup = &hitem->hash_itup;
+	itup = (IndexTuple) PageGetItem(page, PageGetItemId(page, offnum));
 	scan->xs_ctup.t_self = itup->t_tid;
 
 	return true;
@@ -126,7 +124,6 @@ _hash_first(IndexScanDesc scan, ScanDirection dir)
 	Page		page;
 	HashPageOpaque opaque;
 	HashMetaPage metap;
-	HashItem	hitem;
 	IndexTuple	itup;
 	ItemPointer current;
 	OffsetNumber offnum;
@@ -218,8 +215,7 @@ _hash_first(IndexScanDesc scan, ScanDirection dir)
 	offnum = ItemPointerGetOffsetNumber(current);
 	_hash_checkpage(rel, buf, LH_BUCKET_PAGE | LH_OVERFLOW_PAGE);
 	page = BufferGetPage(buf);
-	hitem = (HashItem) PageGetItem(page, PageGetItemId(page, offnum));
-	itup = &hitem->hash_itup;
+	itup = (IndexTuple) PageGetItem(page, PageGetItemId(page, offnum));
 	scan->xs_ctup.t_self = itup->t_tid;
 
 	return true;
@@ -248,7 +244,6 @@ _hash_step(IndexScanDesc scan, Buffer *bufP, ScanDirection dir)
 	OffsetNumber maxoff;
 	OffsetNumber offnum;
 	BlockNumber blkno;
-	HashItem	hitem;
 	IndexTuple	itup;
 
 	current = &(scan->currentItemData);
@@ -345,8 +340,7 @@ _hash_step(IndexScanDesc scan, Buffer *bufP, ScanDirection dir)
 		}
 
 		/* get ready to check this tuple */
-		hitem = (HashItem) PageGetItem(page, PageGetItemId(page, offnum));
-		itup = &hitem->hash_itup;
+		itup = (IndexTuple) PageGetItem(page, PageGetItemId(page, offnum));
 	} while (!_hash_checkqual(scan, itup));
 
 	/* if we made it to here, we've found a valid tuple */

src/backend/access/hash/hashutil.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/access/hash/hashutil.c,v 1.45 2006/01/14 22:03:35 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/access/hash/hashutil.c,v 1.46 2006/01/25 23:26:11 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -60,38 +60,6 @@ _hash_checkqual(IndexScanDesc scan, IndexTuple itup)
 	return true;
 }
 
-/*
- * _hash_formitem -- construct a hash index entry
- */
-HashItem
-_hash_formitem(IndexTuple itup)
-{
-	int			nbytes_hitem;
-	HashItem	hitem;
-	Size		tuplen;
-
-	/* disallow nulls in hash keys */
-	if (IndexTupleHasNulls(itup))
-		ereport(ERROR,
-				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
-				 errmsg("hash indexes cannot contain null keys")));
-
-	/*
-	 * make a copy of the index tuple (XXX do we still need to copy?)
-	 *
-	 * HashItemData used to have more fields than IndexTupleData, but no
-	 * longer...
-	 */
-	tuplen = IndexTupleSize(itup);
-	nbytes_hitem = tuplen +
-		(sizeof(HashItemData) - sizeof(IndexTupleData));
-
-	hitem = (HashItem) palloc(nbytes_hitem);
-	memcpy(&(hitem->hash_itup), itup, tuplen);
-
-	return hitem;
-}
-
 /*
  * _hash_datum2hashkey -- given a Datum, call the index's hash procedure
  */

src/include/access/hash.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/access/hash.h,v 1.64 2005/11/06 19:29:01 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/access/hash.h,v 1.65 2006/01/25 23:26:11 tgl Exp $
  *
  * NOTES
  *		modeled after Margo Seltzer's hash implementation for unix.
@@ -158,13 +158,6 @@ typedef struct HashMetaPageData
 
 typedef HashMetaPageData *HashMetaPage;
 
-typedef struct HashItemData
-{
-	IndexTupleData hash_itup;
-} HashItemData;
-
-typedef HashItemData *HashItem;
-
 /*
  * Maximum size of a hash index item (it's okay to have only one per page)
  */
@@ -267,7 +260,7 @@ extern Datum hash_any(register const unsigned char *k, register int keylen);
 /* private routines */
 
 /* hashinsert.c */
-extern void _hash_doinsert(Relation rel, HashItem hitem);
+extern void _hash_doinsert(Relation rel, IndexTuple itup);
 
 /* hashovfl.c */
 extern Buffer _hash_addovflpage(Relation rel, Buffer metabuf, Buffer buf);
@@ -305,7 +298,6 @@ extern bool _hash_step(IndexScanDesc scan, Buffer *bufP, ScanDirection dir);
 
 /* hashutil.c */
 extern bool _hash_checkqual(IndexScanDesc scan, IndexTuple itup);
-extern HashItem _hash_formitem(IndexTuple itup);
 extern uint32 _hash_datum2hashkey(Relation rel, Datum key);
 extern Bucket _hash_hashkey2bucket(uint32 hashkey, uint32 maxbucket,
 					 uint32 highmask, uint32 lowmask);