Cannot add column to flexible table when ddl autocommit is off using Procedure

Question

Hello All,
Through procedure I am trying to insert data into the target(EX_92) table(with schema flexibility)
Source table data
ID
PRODUCT_CODE
PRODUCT_NAME
PRICE
COLOR
TYPE
1
1
rugg
101.22
2
1
rugg
101.22
3
2
book
200.32
BLUE
Y
Target table QUERY
drop table EX_P2;
CREATE COLUMN TABLE EX_P2(
ID INTEGER PRIMARY KEY,
PRODUCT_CODE VARCHAR(3),
PRODUCT_NAME NVARCHAR(20),
PRICE DECIMAL(5,2)
) WITH SCHEMA FLEXIBILITY;
Procedure to insert above records with additional columns into the target table(EX_P2)
Procedure
drop procedure "DS_O1"."PROC";
create procedure "DS_O1"."PROC"(IN max_value INTEGER, IN schema_name varchar(40), IN table_name varchar(40), IN column_list varchar(400))
LANGUAGE SQLSCRIPT  AS
BEGIN
DECLARE maxid integer :=0;
DECLARE INSERT_STR VARCHAR(1000) :='';
select max(ID) into maxid from "DS_O1"."EX_P2";
select :maxid from dummy;
INSERT_STR :='insert into "' || 'DS_O1' ||'"."EX_P2" ('||:column_list||') (select ' ||:column_list||'
  FROM "'||:schema_name||'"."'||:table_name||'"' || ' where  ID  >' || :max_value  || ')';
EXECUTE immediate(:INSERT_STR);
END;
Now while executing above procedure
CALL "DS_O1"."PROC" ( 0, 'DS_O1', 'TMP_EXL2','ID,PRODUCT_CODE,PRODUCT_NAME,PRICE,COLOR,STATUS,TYPE');
I am getting the following error
Could not execute 'CALL "DS_O1"."PROC" ( 0, 'DS_O1', 'TMP_EXL2','ID,PRODUCT_CODE,PRODUCT_NAME,PRICE,COLOR,STATUS,TYPE')' in 23 ms 564 µs .
SAP DBTech JDBC: [7]: feature not supported:  [7] "DS_O1"."PROC": line 18 col 1 (at pos 779): [7] (range 3): feature not supported: cannot add column to flexible table when ddl autocommit is off

Answer 1

Hi Rajnish,
I had the same issue. For what it’s worth I was able to do a workaround basically creating all the columns when I create the table. The following code works for me to create the table which is just a matrix with one Integer column as the key and the rest as type Double.
It is not ideal in all scenarios because the table columns cannot be added dynamically via a procedure at a later point. This table has 27K columns now
Of course one of the advantages of a flex table would be programmatically adding columns dynamically. This works, but maybe there is still a way to add columns dynamically from a procedure, and someone else can advise.
Apparently dynamically adding columns via procedures may have some "minor" limitations due to the need to compile the procedure with knowledge of the flex table DDL. But again, hopefully someone knows another solution.
Best regards,
Mark
DROP PROCEDURE CREATE_MATRIX;
CREATE PROCEDURE CREATE_MATRIX(
    LANGUAGE SQLSCRIPT
    SQL SECURITY INVOKER
    AS
/*********BEGIN PROCEDURE SCRIPT ************/
BEGIN
    -- cursor over messages
    declare cursor matrix_cursor for
        select distinct TERM
        from TERMS
        order by term;
       declare cnt INTEGER := 0;
       declare temptxt NVARCHAR(500000) := 'CREATE COLUMN TABLE DOC_MATRIX ( CONTENT_ID INTEGER ';
    for cur_matrix as matrix_cursor do
      cnt:=:cnt + 1;
           select temptxt || ', C' || cnt || ' DOUBLE' into temptxt from dummy;
    end for;
      temptxt:=temptxt || ' ) WITH SCHEMA FLEXIBILITY';
       EXEC :temptxt;
       select :temptxt from dummy;
END;
DROP TABLE DOC_MATRIX;
CALL CREATE_MATRIX();