Fix：修复 SQL 子查询语义诊断误报 (#2184)

* Fix：修复 SQL 子查询语义诊断误报

* Improve：添加 SQL 语义诊断开关

* Improve：优化 SQL 语义诊断开关说明

* Fix：收紧 SQL 语义诊断飘红范围

* Improve：调整 SQL 语义诊断默认策略

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Co-authored-by: staff <staff@qimaos-MacBook-Pro.local>

crates/dbx-core/tests/sql_analysis.rs

@@ -13,6 +13,26 @@ fn extracts_tables_aliases_and_qualified_columns() {
     assert_eq!(columns, vec![(Some("u"), "missing"), (Some("u"), "id")]);
 }
 
+#[test]
+fn extracts_nested_query_scopes_for_correlated_subqueries() {
+    let sql = "select aa.house_id from mds_base_house aa where exists (select 1 from mds_base_owner where HOUSE_ID = aa.HOUSE_ID)";
+    let analysis = analyze_sql_references(sql, Some("mysql")).unwrap();
+
+    let tables: Vec<_> =
+        analysis.tables.iter().map(|table| (table.name.as_str(), table.alias.as_deref(), table.scope_id)).collect();
+    assert_eq!(tables, vec![("mds_base_house", Some("aa"), 0), ("mds_base_owner", None, 1)]);
+
+    let scopes: Vec<_> = analysis.scopes.iter().map(|scope| (scope.id, scope.parent_id)).collect();
+    assert_eq!(scopes, vec![(0, None), (1, Some(0))]);
+
+    let columns: Vec<_> = analysis
+        .columns
+        .iter()
+        .map(|column| (column.qualifier.as_deref(), column.name.as_str(), column.scope_id))
+        .collect();
+    assert_eq!(columns, vec![(Some("aa"), "house_id", 0), (None, "HOUSE_ID", 1), (Some("aa"), "HOUSE_ID", 1)]);
+}
+
 #[test]
 fn extracts_unqualified_columns_from_single_table_select() {
     let analysis = analyze_sql_references("select missing, id from users", Some("postgres")).unwrap();