fix: splitter for alter column

Author: psteinroe

crates/pglt_analyser/src/lint/safety/ban_drop_column.rs

@@ -12,7 +12,7 @@ declare_lint_rule! {
     ///
     /// ### Invalid
     ///
-    /// ```sql,ignore
+    /// ```sql,expect_diagnostic
     /// alter table test drop column id;
     /// ```
     ///

crates/pglt_analyser/src/lint/safety/ban_drop_not_null.rs

@@ -12,7 +12,7 @@ declare_lint_rule! {
     ///
     /// ### Invalid
     ///
-    /// ```sql,ignore
+    /// ```sql,expect_diagnostic
     /// alter table users alter column email drop not null;
     /// ```
     pub BanDropNotNull {

crates/pglt_statement_splitter/src/lib.rs

@@ -104,6 +104,12 @@ mod tests {
         ]);
     }
 
+    #[test]
+    fn alter_column() {
+        Tester::from("alter table users alter column email drop not null;")
+            .expect_statements(vec!["alter table users alter column email drop not null;"]);
+    }
+
     #[test]
     fn insert_expect_error() {
         Tester::from("\ninsert select 1\n\nselect 3")

crates/pglt_statement_splitter/src/parser/ddl.rs

@@ -11,5 +11,5 @@ pub(crate) fn create(p: &mut Parser) {
 pub(crate) fn alter(p: &mut Parser) {
     p.expect(SyntaxKind::Alter);
 
-    unknown(p, &[]);
+    unknown(p, &[SyntaxKind::Alter]);
 }