jayzhan211 commented on code in PR #10560:
URL: https://github.com/apache/datafusion/pull/10560#discussion_r1626750687
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datafusion-examples/examples/advanced_udaf.rs:
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@@ -412,7 +412,7 @@ async fn main() -> Result<()> {
let df = ctx.table("t").await?;
// perform the aggregation
- let df = df.aggregate(vec![], vec![geometric_mean.call(vec![col("a")])])?;
+ let df = df.aggregate(vec![],
vec![geometric_mean.call(vec![col("a")]).build()])?;
Review Comment:
It looks good to me to have both style for function call.
How about the API call in expr_fn? UDAF (`geometric_mean`) is not a free
function that could be called anywhere. API call in expr_fn might be used more
frequently.
Should we introduce builder mode?
Current state:
expr_fn::first_value(args, distinct, filter, order_by, null_treatment)
Builder mode:
expr_fn::first_value_builder(args).build()
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