bug: type error when accessing `length()` without schema information

[choucavalier]

What happened?

The following example is self-explanatory

By default, it's assumed that t.some_col is of type Column, while it could be of type ArrayColumn (or other more specific types for that matter).

This results in typing issues.

import ibis
import pandas as pd


d = pd.DataFrame(
  {
    "some_col": [
      [1, 2, 3],
      [4, 5],
    ]
  }
)
t = ibis.memtable(d)

t.some_col.length()  # ■ Cannot access attribute "length" for class "Column"

What version of ibis are you using?

9.5.0

What backend(s) are you using, if any?

DuckDB

Relevant log output

No response

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