## firstAggregateFunction
```mermaid
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flowchart LR
firstAggregateFunction_start([firstAggregateFunction])
firstAggregateFunction_start --> firstAggregateFunction_0_0[FIRST]
firstAggregateFunction_0_0 --> firstAggregateFunction_0_1["("]
firstAggregateFunction_0_1 --> firstAggregateFunction_0_2[expression]
firstAggregateFunction_0_2 --> firstAggregateFunction_0_3[")"]
firstAggregateFunction_0_3 --> firstAggregateFunction_end(( ))
```