"msgpack: number of fields in array-encoded struct has changed" while using "GetTyped"

[Ponywka]

Due to the specifics of the Lua language, a structure that has an empty value at the end (for example, {0, nil, 1, 2, nil}) is truncated to the last non-nil value and becomes {0, nil, 1, 2}.

More details are available in the Tarantool documentation.

Despite this behavior, this Go module still uses the github.com/vmihailenco/msgpack module in the decoder (see here), which reports an error in such cases:
msgpack: number of fields in array-encoded struct has changed.

I submitted a fix for this problem here (vmihailenco/msgpack#382), but I have no idea how soon it will be accepted.

[oleg-jukovec]

You could use box.NULL instead of the nil in the Tarantool's code:

{0, box.NULL, 1, 2, box.NULL}

[Ponywka]

You could use box.NULL instead of the nil in the Tarantool's code

Unfortunately, this is not always possible. For example, if the data is already stored in Tarantool in this (nil) format.