Explain EXPLAIN SYNTAX (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 2)
    ExpressionList (children 1)
     Asterisk (children 1)
      ColumnsTransformerList (children 2)
       ColumnsReplaceTransformer (children 1)
        ColumnsReplaceTransformer::Replacement (children 1)
         Function plus (children 1)
          ExpressionList (children 2)
           Identifier i
           Literal UInt64_1
       ColumnsReplaceTransformer (children 1)
        ColumnsReplaceTransformer::Replacement (children 1)
         Function plus (children 1)
          ExpressionList (children 2)
           Identifier i
           Literal UInt64_1
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier columns_transformers