power-query-m
Power Query (M Language)
Overview
Power Query is the data transformation engine in Power BI, using the M functional language. It handles ETL (Extract, Transform, Load) from sources to the data model. Understanding query folding, step optimization, and M syntax is critical for performant data refresh.
Query Folding
Query folding translates M steps into native source queries (SQL, OData, etc.), pushing computation to the source instead of the mashup engine.
How to check folding:
- Right-click a step in Applied Steps > "View Native Query" -- if grayed out, folding broke
- Use Query Diagnostics (Tools > Start Diagnostics) to see what queries are sent
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