Enhance PLSQL DDL for Alter Database

[ilyasahsan123]

Reference:
https://docs.oracle.com/en/database/oracle/oracle-database/12.2/sqlrf/ALTER-DATABASE.html#GUID-8069872F-E680-4511-ADD8-A4E30AF67986__I2080163

[kaby76]

Hmm. "full_database_recovery" seems to require the DATABASE token. https://docs.oracle.com/en/database/oracle/oracle-database/12.2/sqlrf/ALTER-DATABASE.html#GUID-8069872F-E680-4511-ADD8-A4E30AF67986__I2128285 . It is optional and the doc wrong? Also, can't the expression ( ( ... )+ )? following DATABASE in the rule be ( ... )*? (NB: I need to fix the script that detects useless parentheses as it flags the outer parens as useless, but it is not. https://github.com/antlr/grammars-v4/actions/runs/9044581722/job/24853394579#step:15:131 kaby76/g4-scripts#2 )

[teverett]

@kaby76 this is not quite ready to merge yet?

[kaby76]

@kaby76 this is not quite ready to merge yet?

No, it's not quite ready. I still don't understand why the doc says DATABASE is required in full_database_recovery but here @ilyasahsan123 changed it to be optional. Please address.