fix automigrate when dropping columns on fractionally indexed tables

Author: tantaman

core/rs/core/src/automigrate.rs

@@ -240,6 +240,10 @@ fn drop_columns(
     table: &str,
     columns: Vec<String>,
 ) -> Result<ResultCode, ResultCode> {
+    local_db.exec_safe(&format!(
+        "DROP VIEW IF EXISTS \"{table}_fractindex\"",
+        table = crate::util::escape_ident(table)
+    ))?;
     for col in columns {
         local_db.exec_safe(&format!(
             "ALTER TABLE \"{table}\" DROP \"{column}\"",

core/rs/integration-check/tests/automigrate.rs

@@ -553,6 +553,28 @@ fn remove_col_impl() -> Result<(), ResultCode> {
     Ok(())
 }
 
+#[test]
+fn remove_col_fract_table() {
+    let db = integration_utils::opendb().expect("db opened");
+    db.db
+        .exec_safe("CREATE TABLE todo (id primary key, content text, position, thing)")
+        .expect("table made");
+    db.db
+        .exec_safe("SELECT crsql_fract_as_ordered('todo', 'position');")
+        .expect("as ordered");
+
+    let schema = "
+      CREATE TABLE IF NOT EXISTS todo (
+          id primary key,
+          content text,
+          position
+      );
+  ";
+    invoke_automigrate(&db.db, schema).expect("migrated");
+
+    assert!(expect_columns(&db.db, "todo", vec!["id", "content", "position"]).expect("matched"));
+}
+
 fn remove_index_impl() -> Result<(), ResultCode> {
     let db = integration_utils::opendb()?;
     db.db.exec_safe(