Jeff Davis 35c0cd3b05 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.

2014-05-06 19:27:43 -07:00

17 KiB

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