SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    Function count (children 1)
     ExpressionList
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier foo
   Function match (children 1)
    ExpressionList (children 2)
     Identifier path
     Literal \'^xxx\\\\.zzz\'
   Set
