v0.12.0 - 2021-08-17

This release focuses on improving and expanding upon the existing constraints. More specifically, the users can now
(1) specify multiple columns in Positive and Negative constraints, (2) use the new Uniqueconstraint and
(3) use datetime data with the Between constraint. Additionaly, error messages have been added and updated
to provide more useful feedback to the user.

Besides the added features, several bugs regarding the UniqueCombinations and ColumnFormula constraints have been fixed,
and an error in the metadata.json for the student_placements dataset was corrected. The release also added documentation
for the fit_columns_model which affects the majority of the available constraints.

New Features

• Change default fit_columns_model to False - Issue #550 by @katxiao
• Support multi-column specification for positive and negative constraint - Issue #545 by @sarahmish
• Raise error when multiple constraints can't be enforced - Issue #541 by @amontanez24
• Create Unique Constraint - Issue #532 by @amontanez24
• Passing invalid conditions when using constraints produces unreadable errors - Issue #511 by @katxiao
• Improve error message for ColumnFormula constraint when constraint column used in formula - Issue #508 by @katxiao
• Add datetime functionality to Between constraint - Issue #504 by @katxiao

Bugs Fixed

• UniqueCombinations constraint with handling_strategy = 'transform' yields synthetic data with nan values - Issue #521 by @katxiao and @csala
• UniqueCombinations constraint outputting wrong data type - Issue #510 by @katxiao and @csala
• UniqueCombinations constraint on only one column gets stuck in an infinite loop - Issue #509 by @katxiao
• Conditioning on a non-constraint column using the ColumnFormula constraint - Issue #507 by @katxiao
• Conditioning on the constraint column of the ColumnFormula constraint - Issue #506 by @katxiao
• Update metadata.json for duration of student_placements dataset - Issue #503 by @amontanez24
• Unit test for HMA1 when working with a single child row per parent row - Issue #497 by @pvk-developer
• UniqueCombinations constraint for more than 2 columns - Issue #494 by @katxiao and @csala

Documentation Changes

• Add explanation of fit_columns_model to API docs - Issue #517 by @katxiao