Explain EXPLAIN SYNTAX (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 2)
    ExpressionList (children 1)
     Function plus (children 1)
      ExpressionList (children 2)
       Function plus (children 1)
        ExpressionList (children 2)
         Function sum (children 1)
          ExpressionList (children 1)
           Identifier decimal32
         Function multiply (children 1)
          ExpressionList (children 2)
           Literal UInt64_2
           Function count (children 1)
            ExpressionList (children 1)
             Identifier decimal32
       Function plus (children 1)
        ExpressionList (children 2)
         Function sum (children 1)
          ExpressionList (children 1)
           Identifier decimal32
         Function multiply (children 1)
          ExpressionList (children 2)
           Literal UInt64_3
           Function count (children 1)
            ExpressionList (children 1)
             Identifier decimal32
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier test_table
