feat: add schema change (#27)

Author: QuakeWang

crates/paimon/Cargo.toml

@@ -32,7 +32,7 @@ chrono = { version = "0.4.38", features = ["serde"] }
 serde = { version = "1", features = ["derive"] }
 serde_bytes = "0.11.15"
 serde_json = "1.0.120"
-serde_with = "3.8.3"
+serde_with = "3.9.0"
 snafu = "0.8.3"
 typed-builder = "^0.19"
 opendal = "0.48"

crates/paimon/src/spec/mod.rs

@@ -25,6 +25,9 @@ pub use data_file::*;
 mod schema;
 pub use schema::*;
 
+mod schema_change;
+pub use schema_change::*;
+
 mod snapshot;
 pub use snapshot::*;