Explain EXPLAIN PIPELINE (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 1)
     Identifier key
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier data_01551
    ExpressionList (children 2)
     Identifier key
     Function divide (children 1)
      ExpressionList (children 2)
       Identifier key
       Literal UInt64_2
