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Document that libpq's PQntuples() might overflow.

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Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-<!-- $PostgreSQL: pgsql/doc/src/sgml/libpq.sgml,v 1.245 2007/09/14 14:54:25 momjian Exp $ -->`
	`1`	`+<!-- $PostgreSQL: pgsql/doc/src/sgml/libpq.sgml,v 1.246 2007/09/26 08:45:50 momjian Exp $ -->`
`2`	`2`
`3`	`3`	`<chapter id="libpq">`
`4`	`4`	`<title><application>libpq</application> - C Library</title>`
`@@ -2092,7 +2092,9 @@ PGresult PQdescribePortal(PGconn conn, const char *portalName);`
`2092`	`2092`
`2093`	`2093`	`<listitem>`
`2094`	`2094`	`<para>`
`2095`		`- Returns the number of rows (tuples) in the query result.`
	`2095`	`+ Returns the number of rows (tuples) in the query result. Because`
	`2096`	`+ it returns an integer result, large result sets might overflow the`
	`2097`	`+ return value on 32-bit operating systems.`
`2096`	`2098`
`2097`	`2099`	`<synopsis>`
`2098`	`2100`	`int PQntuples(const PGresult *res);`

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