Add constraint checks to CBO plan

create table acid_uami(i int,
                 de decimal(5,2) constraint nn1 not null enforced,
                 vc varchar(128) constraint nn2 not null enforced) clustered by (i) into 2 buckets stored as orc TBLPROPERTIES ('transactional'='true');
explain
update acid_uami set de=null where i=1;

Map Operator Tree:
TableScan
            alias: acid_uami
            filterExpr: ((i = 1) and enforce_constraint(vc is not null)) (type: boolean)
            Statistics: Num rows: 1 Data size: 216 Basic stats: COMPLETE Column stats: NONE
            Filter Operator
              predicate: ((i = 1) and enforce_constraint(vc is not null)) (type: boolean)

    Map Reduce
      Map Operator Tree:
          TableScan
            alias: acid_uami
            filterExpr: (i = 1) (type: boolean)
            Statistics: Num rows: 1 Data size: 216 Basic stats: COMPLETE Column stats: NONE
            Filter Operator
              predicate: (i = 1) (type: boolean)
...
      Reduce Operator Tree:
...
         Filter Operator
            predicate: enforce_constraint((null is not null and _col3 is not null)) (type: boolean)

HiveSortExchange(distribution=[any], collation=[[0]])
  HiveProject(row__id=[$5], i=[CAST(1):INTEGER], _o__c2=[null:NULL], vc=[$2])
    HiveFilter(condition=[=($0, 1)])
      HiveTableScan(table=[[default, acid_uami]], table:alias=[acid_uami])