[SYSTEMDS-3370] Incorrect output length for list of lists

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: SystemDS 3.0
• Assignee: Matthias Boehm
• Reporter: Shafaq Siddiqi
• Created: 05/May/22 13:31
• Updated: 08/May/22 16:39
• Resolved: 08/May/22 16:39

Description

DML does not handle the list of lists correctly. Once multiple lists are added to a list object the nested list become immutable and thus could not be modified (append/index).

please refer to following lines of codes.

l1 = list(1, 2, 3)
l2 = list(4, 5, 6)

l3 = list()
l3 = append(l3, l1)
l3 = append(l3, l2)

l4 = l3[1]
l4 = append(l4, 12)
print(toString(l4))
print(length(l4))