CreateQuery pk_order (children 3)
 Identifier pk_order
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration a (children 1)
    DataType Int
   ColumnDeclaration b (children 1)
    DataType Int
 Storage definition (children 2)
  Function MergeTree
  Function divide (children 1)
   ExpressionList (children 2)
    Identifier a
    Identifier b
