refactor: only depend on templaters function and name

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Benchmark for 0dbd317

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| Test | Base | PR | % | |------|--------------|------------------|---| | DepthMap::from_parent | 42.0±0.25µs | **41.7±0.67µs** | **-0.71%** | | fix_complex_query | 11.6±0.07ms | 11.6±0.07ms | 0.00% | | parse_complex_query | 2.9±0.02µs | 2.9±0.04µs | 0.00% | | parse_expression_recursion | 5.1±0.04µs | 5.1±0.04µs | 0.00% | | parse_simple_query | **829.2±7.40ns** | 838.8±24.15ns | **+1.16%** |