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Fix version comparison in Version.pm

Version strings with unequal numbers of parts were being comparedincorrectly. We cure this by treating a missing part in the shorterversion as 0.per complaint from Jehan-Guillaume de Rorthais, but the fix is mine, nothis.Discussion:https://postgr.es/m/20220628225325.53d97b8d@karstBackpatch to release 14 where this code was introduced.

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src/test/perl/PostgreSQL
- Version.pm

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`‎src/test/perl/PostgreSQL/Version.pm‎`

Lines changed: 6 additions & 3 deletions

Original file line number	Diff line number	Diff line change
`@@ -123,9 +123,12 @@ sub _version_cmp`
`123`	`123`
`124`	`124`	`for (my$idx = 0;;$idx++)`
`125`	`125`	`{`
`126`		`-return 0unless (defined$an->[$idx] &&defined$bn->[$idx]);`
`127`		`-return$an->[$idx]<=>$bn->[$idx]`
`128`		`-if ($an->[$idx]<=>$bn->[$idx]);`
	`126`	`+return 0`
	`127`	`+if ($idx >=@$an &&$idx >=@$bn);`
	`128`	`+# treat a missing number as 0`
	`129`	`+my ($anum,$bnum) = ($an->[$idx] \|\| 0,$bn->[$idx] \|\| 0);`
	`130`	`+return$anum<=>$bnum`
	`131`	`+if ($anum<=>$bnum);`
`129`	`132`	`}`
`130`	`133`	`}`
`131`	`134`

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`‎src/test/perl/PostgreSQL/Version.pm‎`

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