Tag: internals
All the articles with the tag "internals".
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Windows Already Ships the Decompressor Power Pivot Needs
VertiPaq's xpress8 compression is raw MS-XCA LZ77 behind a two-field wrapper, and Windows has shipped a decoder for it all along. Enough to read the Power Pivot model inside an Excel workbook from a PowerShell script with no dependencies.
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How VertiPaq Sorts a Table — A Visual Walkthrough
A visual companion to the row-ordering article — step through the greedy bucket-splitting algorithm that VertiPaq uses to maximise RLE compression.
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Parsing Power Pivot Data Models from Excel XLSX Files
Excel workbooks with Power Pivot models contain the same Analysis Services and VertiPaq storage ideas as PBIX files. This article shows how PBIXRay reads them directly from Python.
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PBIX Parsing in Your Browser: Introducing PBIX.info
PBIX.info: a browser-based PBIX inspector built on WebAssembly. Local-first parsing, interactive diagrams, and shareable collaboration links.
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How VertiPaq Sorts Rows to Maximize RLE Compression
How VertiPaq appears to use a greedy row-reordering algorithm to maximise RLE compression across all columns in a segment.
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Reconstructing Column Data from .idf and .idfmeta
How VertiPaq stores column segments in .idf and .idfmeta files, and how those files combine to reconstruct imported table data from a PBIX file.
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VertiPaq Dictionaries and Hash Indexes
How VertiPaq stores dictionaries and hash indexes inside a PBIX file, and how those structures help turn internal IDs back into readable values.
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The DataModel: Power BI's Embedded Analysis Services Engine
Power BI embeds a full Analysis Services Vertipaq engine inside every PBIX file. This article explains how the DataModel stream works and what it contains.