Group rows of `Table`

[lars-reimann]

Is your feature request related to a problem?

There is currently no way to group the rows of a Table by a specific criteria.

Desired solution

• New method group_by in Table
• It should take one parameter key_selector: Callable[[Row], _T] that computes the grouping key for a row. _T is a type parameter.
• The function should return a dict[T, Table]. The keys are the values computed by the key_selector the values are the rows mapped to that key combined to a Table

Example:

Table:

col1	col2
1	"a"
1	"b"
2	"c"
2	"d"
3	"e"

Key selector:

lambda row: row["col1"]

Expected result:

1:

col1	col2
1	"a"
1	"b"

2:

col1	col2
2	"c"
2	"d"

3:

col1	col2
3	"e"