SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function arrayPushFront (children 1)
     ExpressionList (children 2)
      Literal Array_[\'a\', \'b\', \'c\']
      Identifier val2
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier array_functions
