Explain EXPLAIN (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 2)
    ExpressionList (children 1)
     Asterisk
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       Function s3 (children 1)
        ExpressionList (children 2)
         Literal \'http://localhost:11111/test/a.tsv\'
         Literal \'TSV\'
