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doc: Mention CASCADE/RESTRICT for DROP STATISTICS

This grammar has no effect as there are no dependencies on statistics,but it is supported by the parser. This is more consistent with theother DROP commands.Author: Vignesh CDiscussion:https://postgr.es/m/CALDaNm1LA=yNmzcSfy+0oe6CEAgsxXRf_-UutE3ZncFi8QkFNQ@mail.gmail.comBackpatch-through: 10

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Lines changed: 13 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -21,7 +21,7 @@ PostgreSQL documentation`
`21`	`21`
`22`	`22`	`<refsynopsisdiv>`
`23`	`23`	`<synopsis>`
`24`		`-DROP STATISTICS [ IF EXISTS ] <replaceable class="parameter">name</replaceable> [, ...]`
	`24`	`+DROP STATISTICS [ IF EXISTS ] <replaceable class="parameter">name</replaceable> [, ...] [ CASCADE \| RESTRICT ]`
`25`	`25`	`</synopsis>`
`26`	`26`	`</refsynopsisdiv>`
`27`	`27`
`@@ -59,6 +59,18 @@ DROP STATISTICS [ IF EXISTS ] <replaceable class="parameter">name</replaceable>`
`59`	`59`	`</listitem>`
`60`	`60`	`</varlistentry>`
`61`	`61`
	`62`	`+ <varlistentry>`
	`63`	`+ <term><literal>CASCADE</literal></term>`
	`64`	`+ <term><literal>RESTRICT</literal></term>`
	`65`	`+`
	`66`	`+ <listitem>`
	`67`	`+ <para>`
	`68`	`+ These key words do not have any effect, since there are no dependencies`
	`69`	`+ on statistics.`
	`70`	`+ </para>`
	`71`	`+ </listitem>`
	`72`	`+ </varlistentry>`
	`73`	`+`
`62`	`74`	`</variablelist>`
`63`	`75`	`</refsect1>`
`64`	`76`

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