Method drop_index

crates/ccql/src/sql/composite_storage.rs:686–694

(&mut self, table_name: &str, index_name: &str)

    }

    async fn drop_index(&mut self, table_name: &str, index_name: &str) -> Result<()> {
        if self.is_virtual_table(table_name) {
            Err(GlueError::StorageMsg(
                "Cannot drop index on virtual table".to_string(),
            ))
        } else {
            self.json_storage.drop_index(table_name, index_name).await
        }
    }
}

// Implement AlterTable (delegate to JsonStorage)