This section covers data type conversions between the Trifacta® application and the Parquet file format.
NOTE: The Trifacta® data types listed in this page reflect the raw data type of the converted column. Depending on the contents of the column, the Transformer Page may re-infer a different data type, when a dataset using this type of source is loaded.
NOTE: Dataprep by Trifacta does not support ingest of Parquet files with nested values, which can occur for Map or Object data types.
Trifacta Data Type
Limitations on import:
The Parquet data format supports the use of row groups for organizing chunks of data. This row grouping is helpful for processing across distributed systems.
Dataprep by Trifacta places limitations on the volume of data that can be displayed in the browser. By default, these limits are set to 10 MB.
If Parquet row groups are greater than 10 MB:
- You cannot preview data from the file before import.
When a Parquet-based dataset is loaded in the Transformer page, the screen may be blank.
Tip: You can create a new sample from inside the Transformer page. The sample is displayed normally.
Other product functions work as expected with Parquet format.
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