SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 3)
    Function tokens (alias tokenized) (children 1)
     ExpressionList (children 3)
      Identifier str
      Literal \'ngrams\'
      Literal UInt64_3
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Identifier tokenized
    Function isConstant (children 1)
     ExpressionList (children 1)
      Identifier tokenized
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier tab
