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antirez authored
The previous implementation of SCAN parsed the cursor in the generic function implementing SCAN, SSCAN, HSCAN and ZSCAN. The actual higher-level command implementation only checked for empty keys and return ASAP in that case. The result was that inverting the arguments of, for instance, SSCAN for example and write: SSCAN 0 key Instead of SSCAN key 0 Resulted into no error, since 0 is a non-existing key name very likely. Just the iterator returned no elements at all. In order to fix this issue the code was refactored to extract the function to parse the cursor and return the error. Every higher level command implementation now parses the cursor and later checks if the key exist or not.
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