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Empty DataFrame with Nothing column creates String column when written to Arrow

bugSomething isn't workingSomething isn't working

Status: Open.

#1812 In Kotlin/dataframe;

· Jolanrensen opened on Apr 17, 2026

·  

1.0.0-Beta6

max with more than one selected column on Pivot aggregates each column separately in Notebooks

bugSomething isn't workingSomething isn't working

Status: Open.

Bug

#1811 In Kotlin/dataframe;

· Allex-Nik opened on Apr 17, 2026

readParquet not well suitable for reading directory of files

APIIf it touches our APIIf it touches our API

enhancementNew feature or requestNew feature or request

Status: Open.

#1810 In Kotlin/dataframe;

· koperagen opened on Apr 16, 2026

·  

1.0.0-Backlog

Add datetime parsing/converting guide-testcase

documentationImprovements or additions to documentation (not KDocs)Improvements or additions to documentation (not KDocs)

testsSomething related to the JUnit tests, integration tests or testing infrastructureSomething related to the JUnit tests, integration tests or testing infrastructure

Status: Open.

#1809 In Kotlin/dataframe;

· AndreiKingsley opened on Apr 16, 2026

·  

1.0.0-Backlog

New function to help incrementally migrate String API pipelines to extension properties without DataSchema

APIIf it touches our APIIf it touches our API

Compiler pluginAnything related to the DataFrame Compiler PluginAnything related to the DataFrame Compiler Plugin

enhancementNew feature or requestNew feature or request

Status: Open.

#1808 In Kotlin/dataframe;

· koperagen opened on Apr 16, 2026

·  

1.0.0-Beta6

FrameColumn.schema can produce types with redundant out variance

Status: Open.

#1806 In Kotlin/dataframe;

· koperagen opened on Apr 15, 2026

Extra blank line in ColumnSchema.toString after 2 level nested column group

bugSomething isn't workingSomething isn't working

Status: Open.

#1805 In Kotlin/dataframe;

· koperagen opened on Apr 15, 2026

·  

1.0.0-Beta6

ParserOptions DSL

APIIf it touches our APIIf it touches our API

Status: Open.

#1802 In Kotlin/dataframe;

· Jolanrensen opened on Apr 15, 2026

·  

1.0.0-Backlog

Clean up and centralize col.convertToX()/df.convert {}.toX() implementations

APIIf it touches our APIIf it touches our API

enhancementNew feature or requestNew feature or request

Status: Open.

#1799 In Kotlin/dataframe;

· Jolanrensen opened on Apr 13, 2026

·  

1.0.0-Beta6

Parse date-time and convert docs need to be updated

documentationImprovements or additions to documentation (not KDocs)Improvements or additions to documentation (not KDocs)

Status: Open.

#1798 In Kotlin/dataframe;

· Jolanrensen opened on Apr 13, 2026

·  

1.0.0-Beta6

Possible Sqlite enhancement

databasesJDBC related issuesJDBC related issues

enhancementNew feature or requestNew feature or request

Status: Open.

#1797 In Kotlin/dataframe;

· AndreiKingsley opened on Apr 12, 2026

readExcel: stringColumns argument fails to match columns that are automatically renamed due to duplication.

bugSomething isn't workingSomething isn't working

Status: Open.

#1791 In Kotlin/dataframe;

· chimission opened on Apr 8, 2026