ORA-03137 with scrollable Statements and dpiStmt_execute DPI_MODE_EXEC_DESCRIBE_ONLY

[unficyp]

1. What version of ODPI-C are you using (see dpi.h)?
   5.6.2

2. What OS (and version) is your application on?
   Linux/Manjaro

3. What compiler (and version) did you use?
   g++ 15.2.1

4. What is your version of the Oracle Client (e.g. Instant Client)? How was it installed? Where it is installed?
   Instantclient 23.9.0.25.7

5. What is your Oracle Database version?
   19.26

6. What is the PATH environment variable (on Windows) or LD_LIBRARY_PATH (on Linux) set to?
   /home/oracle/instantclient_23_9

7. What environment variables did you set? How exactly did you set them?
   none

8. What problem or error(s) you are seeing?
   running test gives
   ORA-03137: malformed TTC packet from client rejected: [kpoal8Check-8] [428032] [32898] [] [] [] [] []

when scrollable is set to 1 in dpiConn_prepareStmt and statement is only described with mode DPI_MODE_EXEC_DESCRIBE_ONLY in dpiStmt_execute

9. Do you have a runnable code snippet to describe the problem?
   please see attached source

test_for_issue_202.cpp

[anthony-tuininga]

Thanks for pointing this out. I suspect this is not supported functionality -- but I will confirm, and if it is indeed not supported functionality the error message will be improved!

[anthony-tuininga]

The Oracle Database does not support this mode with scrollable cursors. I adjusted ODPI-C to simply not send that mode to the database if only parsing a statement.