Version: 2019b
Type: Bug Fixes
Category: Data Handling
Subcategory: Worksheet Data Manipulation
Jira: ORG-19654
E.g. for a data with 3 million rows, unstack column in 2019 took about 300 sec while in Origin 2019b, it only takes about 20 sec.
Note: If group column is set as categorical, the unstacking speed can be a little faster.