From a2966b1729e32a98ca88c96219b994b1b3d2e30d Mon Sep 17 00:00:00 2001
From: Dmitry Simonenko <pmwkaa@gmail.com>
Date: Thu, 22 Mar 2012 17:57:55 +0400
Subject: [PATCH] index-iter-prev: lua index prev and select_reverse_range
functions added
---
mod/box/box.lua | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/mod/box/box.lua b/mod/box/box.lua
index cd001a56bb..e582ca72e8 100644
--- a/mod/box/box.lua
+++ b/mod/box/box.lua
@@ -40,6 +40,15 @@ function box.select_range(sno, ino, limit, ...)
return box.space[tonumber(sno)].index[tonumber(ino)]:select_range(tonumber(limit), ...)
end
+--
+-- Select a range of tuples in a given namespace via a given
+-- index in reverse order. If key is NULL, starts from the end, otherwise
+-- starts from the key.
+--
+function box.select_reverse_range(sno, ino, limit, ...)
+ return box.space[tonumber(sno)].index[tonumber(ino)]:select_reverse_range(tonumber(limit), ...)
+end
+
--
-- delete can be done only by the primary key, whose
-- index is always 0. It doesn't accept compound keys
@@ -116,6 +125,16 @@ function box.on_reload_configuration()
end
return unpack(range)
end
+ index_mt.select_reverse_range = function(index, limit, ...)
+ local range = {}
+ for k, v in index.idx.prev, index.idx, ... do
+ if #range >= limit then
+ break
+ end
+ table.insert(range, v)
+ end
+ return unpack(range)
+ end
--
local space_mt = {}
space_mt.len = function(space) return space.index[0]:len() end
@@ -124,6 +143,9 @@ function box.on_reload_configuration()
space_mt.select_range = function(space, ino, limit, ...)
return space.index[ino]:select_range(limit, ...)
end
+ space_mt.select_reverse_range = function(space, ino, limit, ...)
+ return space.index[ino]:select_reverse_range(limit, ...)
+ end
space_mt.select_limit = function(space, ino, offset, limit, ...)
return box.select_limit(space.n, ino, offset, limit, ...)
end
--
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