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Fix broken error check in _hash_doinsert.

You can't just cast a HashMetaPage to a Page, because the meta pagedata is stored after the page header, not at offset 0. Fortunately,this didn't break anything because it happens to find hashm_bsizeat the offset at which it expects to find pd_pagesize_version, andthe values are close enough to the same that this works out.Still, it's a bug, so back-patch to all supported versions.Mithun Cy, revised a bit by me.

1 parent2f802d9 commit097e414Copy full SHA for 097e414

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src/backend/access/hash
- hashinsert.c

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`‎src/backend/access/hash/hashinsert.c‎`

Lines changed: 5 additions & 3 deletions

Original file line number	Diff line number	Diff line change
`@@ -35,6 +35,7 @@ _hash_doinsert(Relation rel, IndexTuple itup)`
`35`	`35`	`BlockNumberblkno;`
`36`	`36`	`BlockNumberoldblkno;`
`37`	`37`	`boolretry;`
	`38`	`+Pagemetapage;`
`38`	`39`	`Pagepage;`
`39`	`40`	`HashPageOpaquepageopaque;`
`40`	`41`	`Sizeitemsz;`
`@@ -58,7 +59,8 @@ _hash_doinsert(Relation rel, IndexTuple itup)`
`58`	`59`	`restart_insert:`
`59`	`60`	`/* Read the metapage */`
`60`	`61`	`metabuf=_hash_getbuf(rel,HASH_METAPAGE,HASH_READ,LH_META_PAGE);`
`61`		`-metap=HashPageGetMeta(BufferGetPage(metabuf));`
	`62`	`+metapage=BufferGetPage(metabuf);`
	`63`	`+metap=HashPageGetMeta(metapage);`
`62`	`64`
`63`	`65`	`/*`
`64`	`66`	`* Check whether the item can fit on a hash page at all. (Eventually, we`
`@@ -67,11 +69,11 @@ _hash_doinsert(Relation rel, IndexTuple itup)`
`67`	`69`	`*`
`68`	`70`	`* XXX this is useless code if we are only storing hash keys.`
`69`	`71`	`*/`
`70`		`-if (itemsz>HashMaxItemSize((Page)metap))`
	`72`	`+if (itemsz>HashMaxItemSize(metapage))`
`71`	`73`	`ereport(ERROR,`
`72`	`74`	`(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),`
`73`	`75`	`errmsg("index row size %zu exceeds hash maximum %zu",`
`74`		`-itemsz,HashMaxItemSize((Page)metap)),`
	`76`	`+itemsz,HashMaxItemSize(metapage)),`
`75`	`77`	`errhint("Values larger than a buffer page cannot be indexed.")));`
`76`	`78`
`77`	`79`	`oldblkno=InvalidBlockNumber;`

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Commit097e414

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`‎src/backend/access/hash/hashinsert.c‎`

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