a2822fb933
When a btree index contains all columns required by the query, and the visibility map shows that all tuples on a target heap page are visible-to-all, we don't need to fetch that heap page. This patch depends on the previous patches that made the visibility map reliable. There's a fair amount left to do here, notably trying to figure out a less chintzy way of estimating the cost of an index-only scan, but the core functionality seems ready to commit. Robert Haas and Ibrar Ahmed, with some previous work by Heikki Linnakangas. |
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| common | ||
| gin | ||
| gist | ||
| hash | ||
| heap | ||
| index | ||
| nbtree | ||
| transam | ||
| Makefile | ||