CBO: Enabling CBO turns on stats estimation, even when the estimation is disabled

create table claims(claim_rec_id bigint, claim_invoice_num string, typ_c int);
alter table claims update statistics set ('numRows'='1154941534','rawDataSize'='1135307527922');


set hive.stats.estimate=false;

explain extended select count(1) from claims where typ_c=3;

set hive.stats.ndv.estimate.percent=5e-7;

explain extended select count(1) from claims where typ_c=3;

'            Map Operator Tree:'
'                TableScan'
'                  alias: claims'
'                  filterExpr: (typ_c = 3) (type: boolean)'
'                  Statistics: Num rows: 1154941534 Data size: 4388777832 Basic stats: COMPLETE Column stats: NONE'
'                  GatherStats: false'
'                  Filter Operator'
'                    isSamplingPred: false'
'                    predicate: (typ_c = 3) (type: boolean)'
'                    Statistics: Num rows: 5 Data size: 19 Basic stats: COMPLETE Column stats: NONE'

'                  filterExpr: (typ_c = 3) (type: boolean)'
'                  Statistics: Num rows: 1154941534 Data size: 4388777832 Basic stats: COMPLETE Column stats: NONE'
'                  GatherStats: false'
'                  Filter Operator'
'                    isSamplingPred: false'
'                    predicate: (typ_c = 3) (type: boolean)'
'                    Statistics: Num rows: 230988307 Data size: 877755567 Basic stats: COMPLETE Column stats: NONE'