Product release and download

Tableau Prep 2020.1.5

We recommend using the newest maintenance release of this version, 2021.3.1, which contains additional fixes.

Download Tableau Prep 2021.3.1

Build number

Download Tableau Prep 2020.1.5

Release date

Tue, April 07, 2020

Product support

Read more

Maintenance ends for Tableau versions 2019.3.x – 2020.3.x on November 11, 2021. Learn more

Resolved Issues

Issue ID Description

If a LOD calculation is used inside an "if" statement and then deleted, it leads to the following error "System error: com.tableau.loom.doc.exceptions.LoomIOException: Problem with IO: Failure parsing AQL: identifier."


Some users of Tableau Prep Builder 2019.3.1 - 2020.1.2 who opted out of sharing their usage data during installation may have unintentionally shared some usage data due to a defect in the Tableau Prep code. Tableau has deleted all usage data collected from Prep Builder versions 2019.3.1 - 2020.1.2. and taken steps to fully correct the issue with the release of Prep Builder 2020.1.5.


When attempting to output a Tableau Prep flow, a calculated column returns null values despite displaying them in the UI.


Using Custom SQL in Tableau Prep Builder, characters such as ">" are duplicated in Custom SQL when you revisit the input step.


When using cleaning steps unable to change data type in input step when connecting to Box or OneDrive. Rows containing strings value remain displayed as "Null".

Download Files