database-compatibility-issues - Add new section Groupby Clob

[thekingofspain]

On page https://github.com/OutSystems/docs-product/blob/master/src/ref/data/database/database-compatibility-issues.md, add a section for:

Grouping on Text Length Above 2000 Characters

Issue
The following error is generated at runtime when grouping on a entity text attribute defined to store more than 2000 characters in an Aggregate action:

[2] ORA-00932: inconsistent datatypes: expected - got CLOB
   at OracleInternal.ServiceObjects.OracleConnectionImpl.VerifyExecution(Int32& cursorId, Boolean bThrowArrayBindRelatedErrors, SqlStatementType sqlStatementType, Int32 arrayBindCount, OracleException& exceptionForArrayBindDML, Boolean& hasMoreRowsInDB, Boolean bFirstIterationDone)

Note, in ServiceStudio, no such error is generated when using the Test Value tab in the Aggregate screen.