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Document that ALTER TABLE .. TYPE removes statistics

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Original file line number	Diff line number	Diff line change
`@@ -198,6 +198,12 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM`
`198`	`198`	`clause must be provided if there is no implicit or assignment`
`199`	`199`	`cast from old to new type.`
`200`	`200`	`</para>`
	`201`	`+`
	`202`	`+ <para>`
	`203`	`+ When this form is used, the column's statistics are removed,`
	`204`	`+ so running <link linkend="sql-analyze"><command>ANALYZE</command></link>`
	`205`	`+ on the table afterwards is recommended.`
	`206`	`+ </para>`
`201`	`207`	`</listitem>`
`202`	`208`	`</varlistentry>`
`203`	`209`

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