sql add an alias to a group by column results lists of that column about polars HOT 2 OPEN

>>> df = pl.DataFrame(
...      {
...          "A": [1, 1, 3, 3, 5],
...          "fruits": ["banana", "banana", "apple", "apple", "banana"],
...          "B": [5, 4, 3, 2, 1],
...          "cars": ["beetle", "audi", "beetle", "beetle", "beetle"],
...      }
...  )
>>>
>>> sql = pl.SQLContext(t=df)
>>> sql.execute("select A, count(*)from t group by A", eager=True)
shape: (3, 2)
┌─────┬─────┐
│ A   ┆ len │
│ --- ┆ --- │
│ i64 ┆ u32 │
╞═════╪═════╡
│ 1   ┆ 2   │
│ 3   ┆ 2   │
│ 5   ┆ 1   │
└─────┴─────┘
>>> sql.execute("select A as o, count(*)from t group by A", eager=True)
shape: (3, 2)
┌─────┬─────┐
│ o   ┆ len │
│ --- ┆ --- │
│ i64 ┆ u32 │
╞═════╪═════╡
│ 5   ┆ 1   │
│ 1   ┆ 2   │
│ 3   ┆ 2   │
└─────┴─────┘
>>> sql.execute("select A%3 as o, count(*)from t group by A%3", eager=True)
shape: (3, 2)
┌───────────┬─────┐
│ o         ┆ len │
│ ---       ┆ --- │
│ list[i64] ┆ u32 │
╞═══════════╪═════╡
│ [0, 0]    ┆ 2   │
│ [2]       ┆ 1   │
│ [1, 1]    ┆ 2   │
└───────────┴─────┘
>>> sql.execute("select A%3 , count(*)from t group by A%3", eager=True)
shape: (3, 2)
┌─────┬─────┐
│ A   ┆ len │
│ --- ┆ --- │
│ i64 ┆ u32 │
╞═════╪═════╡
│ 1   ┆ 2   │
│ 2   ┆ 1   │
│ 0   ┆ 2   │
└─────┴─────┘