[lua]: use not command to check whether the field exists #492
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Signed-off-by: Sihui Han sihan@microsoft.com
What I did
Use not command to check whether the field exists
Why I did it
Redis will convert nil to false in lua script. Need to use "not a" instead of "a==nil"
Redis to Lua conversion table.
Redis integer reply -> Lua number
Redis bulk reply -> Lua string
Redis multi bulk reply -> Lua table (may have other Redis data types nested)
Redis status reply -> Lua table with a single ok field containing the status
Redis error reply -> Lua table with a single err field containing the error
Redis Nil bulk reply and Nil multi bulk reply -> Lua false boolean type
How I verified it
Details if related