Lua script to return efficient dictionary from Redis HGETALL call

Question

I need to use Redis HMGET from a Lua script and extract specific values in following code. But redis.call(\'HMGET\', table_key, hkey1, hkey2, ...)

Answer 1

After some profiling and tests, we found the following function to have good performance and use it to get a proper table.

This save the need to call a getter function for each hash key retrieval.

local function hgetall(hash_key)
    local flat_map = redis.call('HGETALL', hash_key)
    local result = {}
    for i = 1, #flat_map, 2 do
        result[flat_map[i]] = flat_map[i + 1]
    end
    return result
end