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create_func in datafusion::functions_aggregate - Rust
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datafusion::functions_aggregate

Macro create_func

Source 
macro_rules! create_func {
    ($UDAF:ty, $AGGREGATE_UDF_FN:ident) => { ... };
    ($UDAF:ty, $AGGREGATE_UDF_FN:ident, $CREATE:expr) => { ... };
}