feat(spec): implement data field

crates/paimon/src/spec/schema.rs

@@ -18,7 +18,7 @@
 use crate::spec::types::DataType;
 use serde::{Deserialize, Serialize};
 use serde_with::{serde_as, DisplayFromStr};
-use std::collections::HashMap;
+use std::{collections::HashMap, fmt::Display};
 
 /// The table schema for paimon table.
 ///
@@ -51,3 +51,129 @@ pub struct DataField {
     typ: DataType,
     description: Option<String>,
 }
+
+impl DataField {
+    pub fn new(id: i32, name: String, typ: DataType) -> Self {
+        Self {
+            id,
+            name,
+            typ,
+            description: None,
+        }
+    }
+
+    pub fn id(&self) -> i32 {
+        self.id
+    }
+
+    pub fn name(&self) -> &str {
+        &self.name
+    }
+
+    pub fn data_type(&self) -> &DataType {
+        &self.typ
+    }
+
+    pub fn description(&self) -> Option<&str> {
+        self.description.as_deref()
+    }
+
+    pub fn with_id(mut self, new_id: i32) -> Self {
+        self.id = new_id;
+        self
+    }
+
+    pub fn with_name(mut self, new_name: String) -> Self {
+        self.name = new_name;
+        self
+    }
+
+    pub fn with_description(mut self, new_description: Option<String>) -> Self {
+        self.description = new_description;
+        self
+    }
+}
+
+impl Display for DataField {
+    fn fmt(&self, _f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        todo!()
+    }
+}
+
+pub fn escape_identifier(identifier: &str) -> String {
+    identifier.replace('"', "\"\"")
+}
+
+pub fn escape_single_quotes(text: &str) -> String {
+    text.replace('\'', "''")
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::spec::IntType;
+
+    use super::*;
+
+    #[test]
+    fn test_create_data_field() {
+        let id = 1;
+        let name = "field1".to_string();
+        let typ = DataType::Int(IntType::new());
+        let description = "test description".to_string();
+
+        let data_field = DataField::new(id, name.clone(), typ.clone())
+            .with_description(Some(description.clone()));
+
+        assert_eq!(data_field.id(), id);
+        assert_eq!(data_field.name(), name);
+        assert_eq!(data_field.data_type(), &typ);
+        assert_eq!(data_field.description(), Some(description).as_deref());
+    }
+
+    #[test]
+    fn test_new_id() {
+        let d_type = DataType::Int(IntType::new());
+        let new_data_field = DataField::new(1, "field1".to_string(), d_type.clone()).with_id(2);
+
+        assert_eq!(new_data_field.id(), 2);
+        assert_eq!(new_data_field.name(), "field1");
+        assert_eq!(new_data_field.data_type(), &d_type);
+        assert_eq!(new_data_field.description(), None);
+    }
+
+    #[test]
+    fn test_new_name() {
+        let d_type = DataType::Int(IntType::new());
+        let new_data_field =
+            DataField::new(1, "field1".to_string(), d_type.clone()).with_name("field2".to_string());
+
+        assert_eq!(new_data_field.id(), 1);
+        assert_eq!(new_data_field.name(), "field2");
+        assert_eq!(new_data_field.data_type(), &d_type);
+        assert_eq!(new_data_field.description(), None);
+    }
+
+    #[test]
+    fn test_new_description() {
+        let d_type = DataType::Int(IntType::new());
+        let new_data_field = DataField::new(1, "field1".to_string(), d_type.clone())
+            .with_description(Some("new description".to_string()));
+
+        assert_eq!(new_data_field.id(), 1);
+        assert_eq!(new_data_field.name(), "field1");
+        assert_eq!(new_data_field.data_type(), &d_type);
+        assert_eq!(new_data_field.description(), Some("new description"));
+    }
+
+    #[test]
+    fn test_escape_identifier() {
+        let escaped_identifier = escape_identifier("\"identifier\"");
+        assert_eq!(escaped_identifier, "\"\"identifier\"\"");
+    }
+
+    #[test]
+    fn test_escape_single_quotes() {
+        let escaped_text = escape_single_quotes("text with 'single' quotes");
+        assert_eq!(escaped_text, "text with ''single'' quotes");
+    }
+}