Commit3d77411

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doc: add PG 10 doc item about VACUUM truncation,7e26e02

Reported-by: Andres Freund

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`@@ -1744,6 +1744,22 @@`
`1744`	`1744`	`</para>`
`1745`	`1745`	`</listitem>`
`1746`	`1746`
	`1747`	`+ <listitem>`
	`1748`	`+ <!--`
	`1749`	`+ Author: Alvaro Herrera <alvherre@alvh.no-ip.org>`
	`1750`	`+ 2017-01-23 [7e26e02ee] Prefetch blocks during lazy vacuum's truncation scan`
	`1751`	`+ -->`
	`1752`	`+ <para>`
	`1753`	`+ Improve speed of <command>VACUUM</>'s removal of trailing empty`
	`1754`	`+ heap pages (Alvaro Herrera)`
	`1755`	`+ </para>`
	`1756`	`+`
	`1757`	`+ <para>`
	`1758`	`+ This information is also included in <xref`
	`1759`	`+ linkend="guc-log-autovacuum-min-duration"> output.`
	`1760`	`+ </para>`
	`1761`	`+ </listitem>`
	`1762`	`+`
`1747`	`1763`	`<listitem>`
`1748`	`1764`	`<!--`
`1749`	`1765`	`Author: Tom Lane <tgl@sss.pgh.pa.us>`

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