static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(AggregationFunctions.class);
@Override
public FunctionDefinition[] getFunctionDefintions() {
return new FunctionDefinition[] {
FunctionDefinition.aggregator("count", new AnyTypeAllowed(1), OutputTypeDeterminer.FIXED_BIGINT),
FunctionDefinition.aggregator("sum", new AnyTypeAllowed(1), new OutputTypeDeterminer.SameAsFirstInput())
};
}