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Lua arrays can't contain nil elements (see http://www.lua.org/pil/19.1.html for more information), so Lua scripts were not able to return a multi-bulk reply containing nil bulk elements inside. This commit introduces a special conversion: a table with just a "nilbulk" field set to a boolean value is converted by Redis as a nil bulk reply, but at the same time for Lua this type is not a "nil" so can be used inside Lua arrays. This type is also assigned to redis.NIL, so the following two forms are equivalent and will be able to return a nil bulk reply as second element of a three elements array: EVAL "return {1,redis.NIL,3}" 0 EVAL "return {1,{nilbulk=true},3}" 0 The result in redis-cli will be: 1) (integer) 1 2) (nil) 3) (integer) 3 |
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