Commite648e77

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C comment: mention no doc for negative start of substring(text)

Also add URL to hackers discussion.Backpatch-through: master

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Lines changed: 3 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -891,8 +891,9 @@ text_substring(Datum str, int32 start, int32 length, bool length_not_specified)`
`891`	`891`	`int32E;/* end position */`
`892`	`892`
`893`	`893`	`/*`
`894`		`- * SQL99 says S can be zero or negative, but we still must fetch from the`
`895`		`- * start of the string.`
	`894`	`+ * SQL99 says S can be zero or negative (which we don't document), but we`
	`895`	`+ * still must fetch from the start of the string.`
	`896`	`+ * https://www.postgresql.org/message-id/170905442373.643.11536838320909376197%40wrigleys.postgresql.org`
`896`	`897`	`*/`
`897`	`898`	`S1=Max(S,1);`
`898`	`899`

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