use test; drop table if exists t; create table t (a int); explain select * from t where a < 1; id estRows task access object operator info TableReader_7 3323.33 root data:Selection_6 └─Selection_6 3323.33 cop[tikv] lt(test.t.a, 1) └─TableFullScan_5 10000.00 cop[tikv] table:t keep order:false, stats:pseudo insert into mysql.opt_rule_blacklist values('predicate_push_down'); admin reload opt_rule_blacklist; explain select * from t where a < 1; id estRows task access object operator info Selection_5 8000.00 root lt(test.t.a, 1) └─TableReader_7 10000.00 root data:TableFullScan_6 └─TableFullScan_6 10000.00 cop[tikv] table:t keep order:false, stats:pseudo delete from mysql.opt_rule_blacklist where name='predicate_push_down'; admin reload opt_rule_blacklist; explain select * from t where a < 1; id estRows task access object operator info TableReader_7 3323.33 root data:Selection_6 └─Selection_6 3323.33 cop[tikv] lt(test.t.a, 1) └─TableFullScan_5 10000.00 cop[tikv] table:t keep order:false, stats:pseudo insert into mysql.expr_pushdown_blacklist values('<', 'tikv,tiflash,tidb', 'for test'); admin reload expr_pushdown_blacklist; explain select * from t where a < 1; id estRows task access object operator info Selection_5 8000.00 root lt(test.t.a, 1) └─TableReader_7 10000.00 root data:TableFullScan_6 └─TableFullScan_6 10000.00 cop[tikv] table:t keep order:false, stats:pseudo delete from mysql.expr_pushdown_blacklist where name='<' and store_type = 'tikv,tiflash,tidb' and reason = 'for test'; admin reload expr_pushdown_blacklist; explain select * from t where a < 1; id estRows task access object operator info TableReader_7 3323.33 root data:Selection_6 └─Selection_6 3323.33 cop[tikv] lt(test.t.a, 1) └─TableFullScan_5 10000.00 cop[tikv] table:t keep order:false, stats:pseudo insert into mysql.expr_pushdown_blacklist values('lt', 'tikv,tiflash,tidb', 'for test'); admin reload expr_pushdown_blacklist; explain select * from t where a < 1; id estRows task access object operator info Selection_5 8000.00 root lt(test.t.a, 1) └─TableReader_7 10000.00 root data:TableFullScan_6 └─TableFullScan_6 10000.00 cop[tikv] table:t keep order:false, stats:pseudo delete from mysql.expr_pushdown_blacklist where name='lt' and store_type = 'tikv,tiflash,tidb' and reason = 'for test'; admin reload expr_pushdown_blacklist; explain select * from t where a < 1; id estRows task access object operator info TableReader_7 3323.33 root data:Selection_6 └─Selection_6 3323.33 cop[tikv] lt(test.t.a, 1) └─TableFullScan_5 10000.00 cop[tikv] table:t keep order:false, stats:pseudo