大更新：

1、完善SQL语法
2、移除node前端，只保留静态资源
3、写好安装脚本
4、做好linux适配

chusql-storage/tests/catalog_test.rs

@@ -1,5 +1,5 @@
 use chusql_storage::catalog::Catalog;
-use chusql_storage::protocol::{ColumnType, Row};
+use chusql_storage::protocol::Row;
 use serde_json::json;
 
 // 数据字典测试：补列、去重、未知表。
@@ -14,13 +14,13 @@ fn row(pairs: &[(&str, serde_json::Value)]) -> Row {
     m
 }
 
-/// 空文件得到空字典
+/// 空文件得到空字典，未知表返回 None
 #[test]
-fn empty_file_gives_empty_catalog() {
-    let dir = tempfile::tempdir().unwrap();
+fn empty_file_gives_empty_catalog_and_unknown_table_returns_none() {    let dir = tempfile::tempdir().unwrap();
     let path = dir.path().join("catalog.json");
     let c = Catalog::load(&path).unwrap();
     assert_eq!(c.table_names().len(), 0);
+    assert!(c.describe("nope").is_none());
 }
 
 /// 补列之后能查到 schema
@@ -40,9 +40,9 @@ fn ensure_then_describe() {
     assert!(names.contains(&"id"));
     assert!(names.contains(&"name"));
     let id_col = s.columns.iter().find(|c| c.name == "id").unwrap();
-    assert_eq!(id_col.ty, ColumnType::Int);
+    assert_eq!(id_col.ty, "int");
     let name_col = s.columns.iter().find(|c| c.name == "name").unwrap();
-    assert_eq!(name_col.ty, ColumnType::Str);
+    assert_eq!(name_col.ty, "str");
 }
 
 /// 再插入不会重复列
@@ -57,15 +57,6 @@ fn second_insert_does_not_duplicate_columns() {
     assert_eq!(c.describe("users").unwrap().columns.len(), 1);
 }
 
-/// 未知表返回 None
-#[test]
-fn describe_unknown_returns_none() {
-    let dir = tempfile::tempdir().unwrap();
-    let path = dir.path().join("catalog.json");
-    let c = Catalog::load(&path).unwrap();
-    assert!(c.describe("nope").is_none());
-}
-
 /// 删列同时清掉统计与索引
 #[test]
 fn remove_column_drops_definition_stats_and_index() {
@@ -83,10 +74,44 @@ fn remove_column_drops_definition_stats_and_index() {
     assert_eq!(s.columns.len(), 1);
     assert_eq!(s.columns[0].name, "id");
     assert!(s.indexes.is_empty(), "index on code should be gone");
-    assert!(s.stats.get("code").is_none(), "stats for code should be gone");
+    assert!(!s.stats.contains_key("code"), "stats for code should be gone");
 
     let again = c.remove_column("t", "code").unwrap();
     assert!(!again);
 
     assert!(c.remove_column("nope", "code").is_err());
 }
+
+/// 老类型名并到新写法，参数保留，未知类型原样
+#[test]
+fn normalize_type_maps_legacy_names() {
+    use chusql_storage::catalog::normalize_type;
+    assert_eq!(normalize_type("integer"), "int");
+    assert_eq!(normalize_type("TEXT"), "str");
+    assert_eq!(normalize_type("BOOLEAN"), "bool");
+    assert_eq!(normalize_type("varchar(20)"), "varchar(20)");
+    assert_eq!(normalize_type("numeric(8,2)"), "decimal(8,2)");
+    assert_eq!(normalize_type("real"), "float");
+    assert_eq!(normalize_type("weird"), "weird");
+}
+
+/// 老格式字典（列里没有新字段）能读进来，规范化后写回新写法
+#[test]
+fn legacy_catalog_loads_and_normalizes() {
+    let dir = tempfile::tempdir().unwrap();
+    let path = dir.path().join("catalog.json");
+    std::fs::write(
+        &path,
+        r#"{"tables":{"legacy":{"columns":[{"name":"id","ty":"integer"},{"name":"name","ty":"text"}]}}}"#,
+    )
+    .unwrap();
+
+    let mut c = Catalog::load(&path).unwrap();
+    let s = c.describe("legacy").unwrap();
+    assert_eq!(s.columns.len(), 2);
+    assert!(s.columns[0].nullable, "老列默认可空");
+    assert!(c.normalize_types());
+    let types: Vec<&str> = c.describe("legacy").unwrap().columns.iter().map(|col| col.ty.as_str()).collect();
+    assert_eq!(types, vec!["int", "str"]);
+    assert!(!c.normalize_types(), "第二次没有可改的");
+}