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Regression: list index does not support with columns #7147

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@izveigor

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@izveigor

Is your feature request related to a problem or challenge?

Follow on to #6936
When we apply some kind of index to a list presented as a column, then one element is returned to us instead of the proper number.

Example:

❯ select column1, column2, column3 from slices;
+------------------------------------------+---------+---------+
| column1                                  | column2 | column3 |
+------------------------------------------+---------+---------+
| [, 2, 3, 4, 5, 6, 7, 8, 9, 10]           | 1       | 1       |
| [11, 12, 13, 14, 15, 16, 17, 18, , 20]   | 2       | -4      |
| [21, 22, 23, , 25, 26, 27, 28, 29, 30]   | 0       | 0       |
| [31, 32, 33, 34, 35, , 37, 38, 39, 40]   | -4      | -7      |
|                                          | 4       | 5       |
| [41, 42, 43, 44, 45, 46, 47, 48, 49, 50] |         | 6       |
| [51, 52, , 54, 55, 56, 57, 58, 59, 60]   | 5       |         |
+------------------------------------------+---------+---------+
❯ select column1[2] from slices;
+--------------------------+
| slices.column1[Int64(2)] |
+--------------------------+
| 2                        |
+--------------------------+

Should be:

❯ select column1[2] from slices;
+-------------------+
| slices.column1[2] |
+-------------------+
| 2                 |
| 12                |
| 22                |
| 32                |
| 42                |
| 52                |
+-------------------+

P.S. Struct still supports columns.

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