Optimize date parsing in normalize_cansim_values #164
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Instead of calling as.Date() on every row (millions of rows), build a lookup table for unique date values (typically hundreds or thousands), then use vector lookup for assignment. Benchmark on table 14-10-0287 (5.4M rows): - Original: mean 85.8 sec - Optimized: mean 67.0 sec - Improvement: 22% faster overall Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
as.Date()calls with lookup table approachBenchmark Results
Table 14-10-0287 (5,394,600 rows, year-month format):
The optimization saves ~19 seconds on get_cansim() for this large table.
Verification
Test Tables
🤖 Generated with Claude Code