fix: condition to check presence of custom_partition

Author: Devdutt Shenoi

src/static_schema.rs

@@ -68,7 +68,7 @@ pub fn convert_static_schema_to_arrow_schema(
     let mut time_partition_exists = false;
 
     for partition in custom_partitions {
-        if static_schema
+        if !static_schema
             .fields
             .iter()
             .any(|field| &field.name == partition)