CreateQuery mt1 (children 3)
 Identifier mt1
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration f1 (children 1)
    DataType Int32
   ColumnDeclaration f2 (children 1)
    DataType Int32
 Storage definition (children 2)
  Function MergeTree (children 1)
   ExpressionList
  Identifier f1
