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  1. MariaDB Server
  2. MDEV-19162 Some basic datatypes and functions in oracle compatibility mode do not work
  3. MDEV-20658

sql_mode=oracle does not support XMLAGG(), XMLELEMENT() and EXTRACT() XML functions

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      Most oracle applications use xml aggregation functions like XMLAGG() followed by identifying the XML elements XMLELEMENT() and then calling the EXTRACT() method to extract. This is important for Oracle migrations and is in use by many projects which are using XML in Oracle and are trying to Migrate to MariaDB.

      select
      		 
         deptno,
      		 
         rtrim (xmlagg (xmlelement (e, ename || ',')).extract ('//text()'), ',') enames
      		 
      from
      		 
         emp
      		 
      group by
      		 
         deptno
      		 
      ;
      		 
       
      		 
          DEPTNO ENAMES                                 
      ---------- ----------------------------------------
      		 
              10 CLARK,MILLER,KING                      
              20 SMITH,FORD,ADAMS,SCOTT,JONES           
              30 ALLEN,JAMES,TURNER,BLAKE,MARTIN,WARD

      Reference: http://www.dba-oracle.com/t_xmlagg.htm

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            Unassigned Unassigned
            Faisal Faisal Saeed
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