in src/columnar_storage/src/read.rs [127:138]
fn fmt_as(
&self,
_t: datafusion::physical_plan::DisplayFormatType,
f: &mut std::fmt::Formatter,
) -> std::fmt::Result {
write!(
f,
"MergeExec: [primary_keys: {}, keep_builtin: {}]",
self.num_primary_keys, self.keep_builtin
)?;
Ok(())
}