Issue Description:
When exporting data to SBDF (Spotfire Binary Data Format) files from a custom Spotfire application versus the Spotfire Analyst client, users may notice a significant difference in file size. This KB article explains why this occurs and how to manage it effectively.

Root Cause:
The primary reason for the variance in file size lies in the utilization of Run-Length Encoding (RLE) blocks. Specifically, SBDF files generated by the custom application do not employ RLE blocks, resulting in larger file sizes. In contrast, when exporting from Spotfire Analyst, RLE is utilized for certain blocks, reducing the file size.

Technical Background:
The Spotfire.Dxp.Data.Formats.Sbdf.dll library provides support for RLE through the API. Users can leverage the SbdfValueArray.CreateRunLengthArrayEncoding method to enable RLE encoding. This array is then utilized within the SbdfColumnSliceBuilder constructor. In Spotfire 11.7, export and TERR data functions were enhanced to incorporate these methods, thereby enabling more efficient data compression through RLE (see article about What's New in TIBCO Spotfire 11.7)

• https://community.spotfire.com/articles/spotfire/spotfire-sbdf-library/

Doc: Spotfire.Dxp.Data.Formats.Sbdf Namespace

• https://docs.tibco.com/pub/doc_remote/sfire_dev/area/doc/api/TIB_sfire-analyst_api/?topic=html/N_Spotfire_Dxp_Data_Formats_Sbdf.htm