SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function replaceRegexpOne (children 1)
     ExpressionList (children 3)
      Identifier explain
      Literal \'^[ ]*(.*)\'
      Literal \'\\\\1\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (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 viewExplain (children 1)
              ExpressionList (children 3)
               Literal \'EXPLAIN\'
               Literal \'actions = 1\'
               Subquery (children 1)
                SelectWithUnionQuery (children 1)
                 ExpressionList (children 1)
                  SelectQuery (children 3)
                   ExpressionList (children 1)
                    Identifier a1
                   TablesInSelectQuery (children 1)
                    TablesInSelectQueryElement (children 1)
                     TableExpression (children 1)
                      TableIdentifier t18
                   ExpressionList (children 1)
                    Function intDiv (alias a1) (children 1)
                     ExpressionList (children 2)
                      Identifier a
                      Literal UInt64_2
   Function like (children 1)
    ExpressionList (children 2)
     Identifier explain
     Literal \'%Skip merging: %\'