AlterQuery  replicated_merge_tree_pk_sql (children 2)
 ExpressionList (children 2)
  AlterCommand ADD_COLUMN (children 1)
   ColumnDeclaration key2 (children 1)
    DataType UInt64
  AlterCommand MODIFY_ORDER_BY (children 1)
   Function tuple (children 1)
    ExpressionList (children 2)
     Identifier key
     Identifier key2
 Identifier replicated_merge_tree_pk_sql
