[CASSANDRA-8733] List prepend reverses item order

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 2.0.13, 2.1.3
• Severity: Normal
• Assignee: Tom Hobbs
• Reporter: Tom Hobbs

Authors

Tom Hobbs

• Created: 03/Feb/15 22:38
• Updated: 16/Apr/19 09:31
• Resolved: 04/Feb/15 16:56

Description

If you prepend a list of items to a list collection, it will reverse the order of the prepend-list:

cqlsh:ks1> UPDATE foobar SET b = [2, 3] WHERE a = 0;
cqlsh:ks1> select * from foobar;

 a | b
---+--------
 0 | [2, 3]

(1 rows)
cqlsh:ks1> UPDATE foobar SET b = [0, 1] + b WHERE a = 0;
cqlsh:ks1> select * from foobar;

 a | b
---+--------------
 0 | [1, 0, 2, 3]

(1 rows)

This is because we're going through the prepend-list in a normal-order for-loop and prepending each time (in Lists.Prepender).