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Apache Parquet for .NET 6.1.0

Fully managed Apache Parquet implementation.

filecart Windows Updated Oct 14, 2026
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About Apache Parquet for .NET

Fully managed, safe, extremely fast .NET library to read and ?write Apache Parquet files
designed for .NET world (not a wrapper). Targets .NET 8, .NET 7, .NET 6.0, .NET Core 3.1,
.NET Standard 2.1 and .NET Standard 2.0.

Whether you want to build apps for Linux, MacOS, Windows, iOS, Android, Tizen, Xbox, PS4,
Raspberry Pi, Samsung TVs or much more, Parquet.Net has you covered.

License: MIT
Release info Update on Aug 11, 2026
Release notes New
• Big TIME improvements (potentially breaking). Parquet.Net treats TIME logical type as int or long depending on precision and does not attempt to convert to .NET native temporal types which may lose precision. Class serializer also understands TimeOnly. Time uses new schema field TimeDataField which also allows specifying precision and UTC adjustment.

Improvements
• Exposed WriteAllPartsAsync internal method for callers who wish to manually supply definition levels and values (really low-level high-performance API). As wished by @spanglerco in #755.
• BigDecimal encoding 7–17% speed improvement depending on precision and data size. By @rferraton in #740.
• Marked INT96 DateTimeKind as Unspecified by @Kuinox in #695.
• Documentation moved to a dedicated space to break from the GitHub markdown limitations.

Bugs fixed
• Legacy TIME_MILLIS converted type was not handled at all, now it's treated as int, and TIME_MICROS is handled as long, which is consistent with TIME logical type.
• TimeSpan and TimeOnly in class serializer defaults to millisecond precision (used to be microseconds, but those types do not get enough precision to support this).
• .NET TimeStamp type does not map to anything now. Parquet time type which used to be used for mapping does not actually map well as they represent totally different temporal meanings (time of day and interval of time). If you need to represent a time interval, use Interval Type.
• Use absolute positioning on every page read, because in some edge cases page reader may not exhaust page data in #781 and #777 and 776 by @mukunku.

Breaking changes
• UseTimeOnlyTypeForTimeMillis and UseTimeOnlyTypeForTimeMicros removed from ParquetOptions due to better time handling logic so they are not used anymore.
Related tags apache-parquet apache-spark dotnet dotnet-core dotnet-standard
Listing datawinget

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