remove unused function

Author: ZENOTME

crates/iceberg/src/spec/partition.rs

@@ -133,25 +133,6 @@ impl UnboundPartitionSpec {
     pub fn builder() -> UnboundPartitionSpecBuilder {
         UnboundPartitionSpecBuilder::default()
     }
-
-    /// Create a [`PartitionSpec`] for a new table. So it don't need
-    /// to specify the partition id for each field.
-    pub fn create_new(self) -> PartitionSpec {
-        PartitionSpec {
-            spec_id: self.spec_id.unwrap_or(0),
-            fields: self
-                .fields
-                .into_iter()
-                .enumerate()
-                .map(|(field_id, f)| PartitionField {
-                    source_id: f.source_id,
-                    field_id: f.partition_id.unwrap_or(field_id as i32),
-                    name: f.name,
-                    transform: f.transform,
-                })
-                .collect(),
-        }
-    }
 }
 
 #[cfg(test)]