- Add handling of XMLTABLE() expression
    https://www.postgresql.org/docs/current/functions-xml.html#id-1.5.8.21.6.3
- add handling of AlterFunctionStmt
- add handling of AlterRoleSetStmt
- add handling of AlterTableStmt
- add handling of CopyStmt
- add handling of CreateExtensionStmt
- add handling of CreateFunctionStmt
- add handling of CreateSeqStmt
- add handling of CreateStmt
- add handling of CreateTableAsStmt
- add handling of DeclareCursorStmt
- add handling of DiscardStmt
- add handling of DoStmt
- add handling of DropStmt
- add handling of ExplainStmt
- add handling of FetchStmt
- add handling of IndexStmt
- add handling of PrepareStmt
- add handling of RefreshMatViewStmt
- add handling of TransactionStmt
- add handling of VacuumStmt
- add handling of VacuumStmt
- add handling of VariableSetStmt
- add handling of VariableShowStmt
- add handling of ViewStmt
