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Improve comment for tricky aspect of index-only scans.

author Jeff Davis <jdavis@postgresql.org>

Sun, 4 May 2014 20:18:55 +0000 (13:18 -0700)

committer Jeff Davis <jdavis@postgresql.org>

Wed, 7 May 2014 02:27:43 +0000 (19:27 -0700)

commit 35c0cd3b05b0be18dc2d049c33b38a2d13993ffe

tree 5af0e7df971771484e8b7f976867ca89edf9889a tree

parent 3a9d430af515e9dd8a9d34a4011367e667a66521 commit | diff

Improve comment for tricky aspect of index-only scans.

Index-only scans avoid taking a lock on the VM buffer, which would
cause a lot of contention. To be correct, that requires some intricate
assumptions that weren't completely documented in the previous
comment.

Reviewed by Robert Haas.

src/backend/executor/nodeIndexonlyscan.c diff | blob | blame | history

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