She pressed F5 .

She rewrote the main procedure to use the new function. Another F5 . This time, the query finished in 0.3 seconds instead of 47. She ran SET STATISTICS TIME ON in a separate tab, just to watch the numbers tumble. Logical reads dropped from 18,000 to 400.

"Execution Plan," she whispered to herself, right-clicking the query pane. The graphical plan appeared, a surreal flowchart of arrows and boxes. Somewhere in that labyrinth of nested loops and hash matches, a monster was hiding. A parallel scan costing 87% of the query. Ridiculous.

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