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The comment incorrectly indicated that indexcollations[] stored collations for both key columns and INCLUDE columns, but in reality it only has elements for the key columns. canreturn[] didn't get a mention, so add that while we're here. Author: Junwang Zhao <zhjwpku@gmail.com> Reviewed-by: David Rowley <dgrowleyml@gmail.com> Discussion: https://postgr.es/m/CAEG8a3LwbZgMKOQ9CmZarX5DEipKivdHp5PZMOO-riL0w%3DL%3D4A%40mail.gmail.com Backpatch-through: 14