Context functions

Function	Support	Notes
`CURRENT_DATABASE`	Supported
`CURRENT_SCHEMA`	Supported
`CURRENT_TRANSACTION`	Supported
`CURRENT_USER`	Supported
`CURRENT_SCHEMAS`	With limitations	Available for some argument types only.
`CURRENT_CLIENT`, `CURRENT_DATE`, `CURRENT_IP_ADDRESS`, `CURRENT_ORGANIZATION_NAME`, `CURRENT_REGION`, `CURRENT_ROLE`, `CURRENT_ROLE_TYPE`, `CURRENT_SECONDARY_ROLES`, `CURRENT_SESSION`, `CURRENT_STATEMENT`, `CURRENT_VERSION`, `CURRENT_WAREHOUSE`, `GETDATE`, `INVOKER_ROLE`, `INVOKER_SHARE`, `IS_APPLICATION_ROLE_IN_SESSION`, `IS_DATABASE_ROLE_IN_SESSION`, `IS_GRANTED_TO_INVOKER_ROLE`, `IS_ROLE_IN_SESSION`, `LAST_TRANSACTION`, `SYSDATE`, `SYSTIMESTAMP`	Not supported