20.7
```
SELECT indexOf(['a', 'b', 'c'], toLowCardinality('a'))

┌─indexOf(['a', 'b', 'c'], toLowCardinality('a'))─┐
│                                               1 │
└─────────────────────────────────────────────────┘
```

20.8
```
SELECT indexOf(['a', 'b', 'c'], toLowCardinality('a'))


Received exception from server (version 20.8.3):
Code: 43. DB::Exception: Received from localhost:9000. DB::Exception: Types of array and 2nd argument of function "indexOf" must be identical up to nullability, cardinality, numeric types, or Enum and numeric type. Passed: Array(String) and LowCardinality(String).. 
```

https://github.com/ClickHouse/ClickHouse/pull/12550

/cc @myrrc 

data.result->getData(),
                null_map_data,
                nullptr);
        else if (const auto item_arg_vector = checkAndGetColumn<ColumnVector<Resulting>>(&data.right))
            Impl::Main<ConcreteAction, false, Initial, Resulting>::vector(
                col_nested->getData(),
                data.offsets,
                item_arg_vector->getData(),
                data.result->getData(),
                null_map_data,
                null_map_item);
        else
            return false;
        data.move_result();
        return true;
    }
    /**
     * Catches arguments of type LC(T) (left) and U (right).
     *
     * The perftests
     * https://clickhouse-test-reports.s3.yandex.net/12550/2d27fa0fa8c198a82bf1fe3625050ccf56695976/integration_tests_(release).html
     * showed that the amount of action needed to convert the non-constant right argument to the index column
     * (similar to the left one's) is significantly higher than converting the array itself to an ordinary column.
     *
     * So, in terms of performance it's more optimal to fall back to default implementation and catch only constant
     * right arguments.
     *
     * Tips and tricks tried can be found at https://github.com/ClickHouse/ClickHouse/pull/12550 .
     */
    static bool executeLowCardinality(ColumnsWithTypeAndName & columns, const ColumnNumbers & arguments, size_t result)