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Diffstat (limited to 'doc/TODO')
| -rw-r--r-- | doc/TODO | 7 |
1 files changed, 4 insertions, 3 deletions
@@ -2,7 +2,7 @@ PostgreSQL TODO List ==================== Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) -Last updated: Mon Apr 25 09:03:30 EDT 2005 +Last updated: Mon Apr 25 11:35:24 EDT 2005 The most recent version of this document can be viewed at http://www.postgresql.org/docs/faqs.TODO.html. @@ -862,12 +862,13 @@ Optimizer / Executor ==================== * Add missing optimizer selectivities for date, r-tree, etc -* Allow ORDER BY ... LIMIT 1 to select high/low value without sort or +* Allow ORDER BY ... LIMIT # to select high/low value without sort or index using a sequential scan for highest/lowest values - Right now, if no index exists, ORDER BY ... LIMIT 1 requires we sort + Right now, if no index exists, ORDER BY ... LIMIT # requires we sort all values to return the high/low value. Instead The idea is to do a sequential scan to find the high/low value, thus avoiding the sort. + MIN/MAX already does this, but not for LIMIT > 1. * Precompile SQL functions to avoid overhead * Create utility to compute accurate random_page_cost value |