```
SELECT version()
─version()─┐
│ 21.8.5.7  │
└───────────┘
```
We have a request, as a result of which we get an array.
When getting an item using a computed value, there is no value
```
SELECT
    arrayMap(x -> x, [[1], [2], [3]]) AS x,
    toTypeName(x),
    x[3 - 2] AS y,
    x[toInt64(1)] AS yy,
    x[toUInt8(1)] AS yyy

┌─x─────────────┬─toTypeName(arrayMap(lambda(tuple(x), x), [[1], [2], [3]]))─┬─y──┬─yy─┬─yyy─┐
│ [[1],[2],[3]] │ Array(Array(UInt8))                                        │ [] │ [] │ [1] │
└───────────────┴────────────────────────────────────────────────────────────┴────┴────┴─────┘
```
However, when the array is explicitly specified, the value is present.
The types are the same.
```
SELECT
    [[1], [2], [3]] AS x,
    toTypeName(x),
    x[3 - 2] AS y,
    x[toInt64(1)] AS yy,
    x[toInt8(1)] AS yyy

┌─x─────────────┬─toTypeName([[1], [2], [3]])─┬─y───┬─yy──┬─yyy─┐
│ [[1],[2],[3]] │ Array(Array(UInt8))         │ [1] │ [1] │ [1] │
└───────────────┴─────────────────────────────┴─────┴─────┴─────┘
```


const IColumn & data, const Offsets & offsets, bool is_key_const,
    const IColumn & index, PaddedPODArray<UInt64> & matched_idxs)
{
    return castColumnNumeric(&data, [&](const auto & data_column)
    {
        return castColumnNumeric(&index, [&](const auto & index_column)
        {
            using DataType = typename std::decay_t<decltype(data_column)>::ValueType;
            using IndexType = typename std::decay_t<decltype(index_column)>::ValueType;
            if constexpr (areConvertibleTypes<IndexType, DataType>)
            {
                MatcherNumber<DataType, IndexType> matcher{data_column.getData(), index_column.getData()};
                if (is_key_const)
                    executeMatchConstKeyToIndex(index_column.size(), data_column.size(), matched_idxs, matcher);
                else
                    executeMatchKeyToIndex(offsets, matched_idxs, matcher);
                return true;
            }
            return false;
        });
    });
}
ColumnPtr FunctionArrayElement::executeMap(