InsertQuery   (children 2)
 Identifier t1
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 3)
     Function substring (children 1)
      ExpressionList (children 3)
       Identifier s1
       Literal UInt64_1
       Literal UInt64_10
     Identifier s2
     Identifier s3
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       Function generateRandom (children 1)
        ExpressionList (children 1)
         Literal \'s1 String, s2 String, s3 String\'
    Literal UInt64_10000
