Explain EXPLAIN SYNTAX (children 2)
 Set
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 5)
    ExpressionList (children 1)
     Literal UInt64_1 (alias compound_value)
    ExpressionList (children 1)
     Asterisk (children 1)
      ColumnsTransformerList (children 1)
       ColumnsApplyTransformer
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier test_table
    Function greater (children 1)
     ExpressionList (children 2)
      Identifier x
      Literal UInt64_0
    Set
