enforce_mpp_suite_out.json

[
  {
    "Name": "TestEnforceMPP",
    "Cases": [
      {
        "SQL": "select @@tidb_allow_mpp",
        "Plan": [
          "1"
        ],
        "Warn": null
      },
      {
        "SQL": "select @@tidb_enforce_mpp",
        "Plan": [
          "0"
        ],
        "Warn": null
      },
      {
        "SQL": "select @@tidb_opt_tiflash_concurrency_factor",
        "Plan": [
          "24"
        ],
        "Warn": null
      },
      {
        "SQL": "set @@tidb_allow_mpp=0",
        "Plan": null,
        "Warn": null
      },
      {
        "SQL": "explain format='verbose' select count(*) from t where a=1",
        "Plan": [
          "StreamAgg_24 1.00 35.88 root  funcs:count(Column#6)->Column#4",
          "└─IndexReader_25 1.00 32.88 root  index:StreamAgg_9",
          "  └─StreamAgg_9 1.00 465.00 cop[tikv]  funcs:count(1)->Column#6",
          "    └─IndexRangeScan_23 10.00 435.00 cop[tikv] table:t, index:idx(a) range:[1,1], keep order:false, stats:pseudo"
        ],
        "Warn": null
      },
      {
        "SQL": "explain format='verbose' select /*+ read_from_storage(tikv[t]) */ count(*) from t where a=1",
        "Plan": [
          "StreamAgg_17 1.00 35.88 root  funcs:count(Column#6)->Column#4",
          "└─IndexReader_18 1.00 32.88 root  index:StreamAgg_9",
          "  └─StreamAgg_9 1.00 465.00 cop[tikv]  funcs:count(1)->Column#6",
          "    └─IndexRangeScan_16 10.00 435.00 cop[tikv] table:t, index:idx(a) range:[1,1], keep order:false, stats:pseudo"
        ],
        "Warn": null
      },
      {
        "SQL": "explain format='verbose' select /*+ read_from_storage(tiflash[t]) */ count(*) from t where a=1",
        "Plan": [
          "StreamAgg_20 1.00 19006.88 root  funcs:count(Column#6)->Column#4",
          "└─TableReader_21 1.00 19003.88 root  data:StreamAgg_9",
          "  └─StreamAgg_9 1.00 285030.00 batchCop[tiflash]  funcs:count(1)->Column#6",
          "    └─Selection_19 10.00 285000.00 batchCop[tiflash]  eq(test.t.a, 1)",
          "      └─TableFullScan_18 10000.00 255000.00 batchCop[tiflash] table:t keep order:false, stats:pseudo"
        ],
        "Warn": null
      },
      {
        "SQL": "set @@tidb_allow_mpp=1;",
        "Plan": null,
        "Warn": null
      },
      {
        "SQL": "set @@tidb_enforce_mpp=0;",
        "Plan": null,
        "Warn": null
      },
      {
        "SQL": "explain format='verbose' select count(*) from t where a=1",
        "Plan": [
          "StreamAgg_30 1.00 35.88 root  funcs:count(Column#7)->Column#4",
          "└─IndexReader_31 1.00 32.88 root  index:StreamAgg_10",
          "  └─StreamAgg_10 1.00 465.00 cop[tikv]  funcs:count(1)->Column#7",
          "    └─IndexRangeScan_29 10.00 435.00 cop[tikv] table:t, index:idx(a) range:[1,1], keep order:false, stats:pseudo"
        ],
        "Warn": null
      },
      {
        "SQL": "explain format='verbose' select /*+ read_from_storage(tikv[t]) */ count(*) from t where a=1",
        "Plan": [
          "StreamAgg_18 1.00 35.88 root  funcs:count(Column#6)->Column#4",
          "└─IndexReader_19 1.00 32.88 root  index:StreamAgg_10",
          "  └─StreamAgg_10 1.00 465.00 cop[tikv]  funcs:count(1)->Column#6",
          "    └─IndexRangeScan_17 10.00 435.00 cop[tikv] table:t, index:idx(a) range:[1,1], keep order:false, stats:pseudo"
        ],
        "Warn": null
      },
      {
        "SQL": "explain format='verbose' select /*+ read_from_storage(tiflash[t]) */ count(*) from t where a=1",
        "Plan": [
          "HashAgg_21 1.00 11910.73 root  funcs:count(Column#6)->Column#4",
          "└─TableReader_23 1.00 11877.13 root  data:ExchangeSender_22",
          "  └─ExchangeSender_22 1.00 285030.00 mpp[tiflash]  ExchangeType: PassThrough",
          "    └─HashAgg_9 1.00 285030.00 mpp[tiflash]  funcs:count(1)->Column#6",
          "      └─Selection_20 10.00 285000.00 mpp[tiflash]  eq(test.t.a, 1)",
          "        └─TableFullScan_19 10000.00 255000.00 mpp[tiflash] table:t keep order:false, stats:pseudo"
        ],
        "Warn": null
      },
      {
        "SQL": "set @@tidb_opt_tiflash_concurrency_factor = 1000000",
        "Plan": null,
        "Warn": null
      },
      {
        "SQL": "explain format='verbose' select count(*) from t where a=1",
        "Plan": [
          "HashAgg_24 1.00 33.89 root  funcs:count(Column#6)->Column#4",
          "└─TableReader_26 1.00 0.29 root  data:ExchangeSender_25",
          "  └─ExchangeSender_25 1.00 285030.00 mpp[tiflash]  ExchangeType: PassThrough",
          "    └─HashAgg_9 1.00 285030.00 mpp[tiflash]  funcs:count(1)->Column#6",
          "      └─Selection_23 10.00 285000.00 mpp[tiflash]  eq(test.t.a, 1)",
          "        └─TableFullScan_22 10000.00 255000.00 mpp[tiflash] table:t keep order:false, stats:pseudo"
        ],
        "Warn": null
      },
      {
        "SQL": "explain format='verbose' select /*+ read_from_storage(tikv[t]) */ count(*) from t where a=1",
        "Plan": [
          "StreamAgg_18 1.00 35.88 root  funcs:count(Column#6)->Column#4",
          "└─IndexReader_19 1.00 32.88 root  index:StreamAgg_10",
          "  └─StreamAgg_10 1.00 465.00 cop[tikv]  funcs:count(1)->Column#6",
          "    └─IndexRangeScan_17 10.00 435.00 cop[tikv] table:t, index:idx(a) range:[1,1], keep order:false, stats:pseudo"
        ],
        "Warn": null
      },
      {
        "SQL": "explain format='verbose' select /*+ read_from_storage(tiflash[t]) */ count(*) from t where a=1",
        "Plan": [
          "HashAgg_21 1.00 33.89 root  funcs:count(Column#6)->Column#4",
          "└─TableReader_23 1.00 0.29 root  data:ExchangeSender_22",
          "  └─ExchangeSender_22 1.00 285030.00 mpp[tiflash]  ExchangeType: PassThrough",
          "    └─HashAgg_9 1.00 285030.00 mpp[tiflash]  funcs:count(1)->Column#6",
          "      └─Selection_20 10.00 285000.00 mpp[tiflash]  eq(test.t.a, 1)",
          "        └─TableFullScan_19 10000.00 255000.00 mpp[tiflash] table:t keep order:false, stats:pseudo"
        ],
        "Warn": null
      },
      {
        "SQL": "set @@tidb_enforce_mpp=1;",
        "Plan": null,
        "Warn": null
      },
      {
        "SQL": "explain format='verbose' select count(*) from t where a=1",
        "Plan": [
          "HashAgg_25 1.00 33.60 root  funcs:count(Column#6)->Column#4",
          "└─TableReader_27 1.00 0.00 root  data:ExchangeSender_26",
          "  └─ExchangeSender_26 1.00 285030.00 mpp[tiflash]  ExchangeType: PassThrough",
          "    └─HashAgg_10 1.00 285030.00 mpp[tiflash]  funcs:count(1)->Column#6",
          "      └─Selection_24 10.00 285000.00 mpp[tiflash]  eq(test.t.a, 1)",
          "        └─TableFullScan_23 10000.00 255000.00 mpp[tiflash] table:t keep order:false, stats:pseudo"
        ],
        "Warn": null
      },
      {
        "SQL": "explain format='verbose' select /*+ read_from_storage(tikv[t]) */ count(*) from t where a=1",
        "Plan": [
          "StreamAgg_19 1.00 35.88 root  funcs:count(Column#6)->Column#4",
          "└─IndexReader_20 1.00 32.88 root  index:StreamAgg_11",
          "  └─StreamAgg_11 1.00 465.00 cop[tikv]  funcs:count(1)->Column#6",
          "    └─IndexRangeScan_18 10.00 435.00 cop[tikv] table:t, index:idx(a) range:[1,1], keep order:false, stats:pseudo"
        ],
        "Warn": [
          "MPP mode may be blocked because you have set a hint to read table `t` from TiKV."
        ]
      },
      {
        "SQL": "explain format='verbose' select /*+ read_from_storage(tiflash[t]) */ count(*) from t where a=1",
        "Plan": [
          "HashAgg_22 1.00 33.60 root  funcs:count(Column#6)->Column#4",
          "└─TableReader_24 1.00 0.00 root  data:ExchangeSender_23",
          "  └─ExchangeSender_23 1.00 285030.00 mpp[tiflash]  ExchangeType: PassThrough",
          "    └─HashAgg_10 1.00 285030.00 mpp[tiflash]  funcs:count(1)->Column#6",
          "      └─Selection_21 10.00 285000.00 mpp[tiflash]  eq(test.t.a, 1)",
          "        └─TableFullScan_20 10000.00 255000.00 mpp[tiflash] table:t keep order:false, stats:pseudo"
        ],
        "Warn": null
      }
    ]
  },
  {
    "Name": "TestEnforceMPPWarning1",
    "Cases": [
      {
        "SQL": "set @@tidb_allow_mpp=1;set @@tidb_enforce_mpp=1;",
        "Plan": null,
        "Warn": null
      },
      {
        "SQL": "explain format = 'brief' select count(*) from t where a=1 -- 1. no replica",
        "Plan": [
          "StreamAgg 1.00 root  funcs:count(Column#8)->Column#6",
          "└─IndexReader 1.00 root  index:StreamAgg",
          "  └─StreamAgg 1.00 cop[tikv]  funcs:count(1)->Column#8",
          "    └─IndexRangeScan 10.00 cop[tikv] table:t, index:idx(a) range:[1,1], keep order:false, stats:pseudo"
        ],
        "Warn": [
          "MPP mode may be blocked because there aren't tiflash replicas of table `t`."
        ]
      },
      {
        "SQL": "cmd: create-replica",
        "Plan": null,
        "Warn": null
      },
      {
        "SQL": "explain select count(*) from t where a=1 -- 2. replica not ready",
        "Plan": [
          "StreamAgg_17 1.00 root  funcs:count(Column#8)->Column#6",
          "└─IndexReader_18 1.00 root  index:StreamAgg_9",
          "  └─StreamAgg_9 1.00 cop[tikv]  funcs:count(1)->Column#8",
          "    └─IndexRangeScan_16 10.00 cop[tikv] table:t, index:idx(a) range:[1,1], keep order:false, stats:pseudo"
        ],
        "Warn": [
          "MPP mode may be blocked because tiflash replicas of table `t` not ready."
        ]
      },
      {
        "SQL": "cmd: enable-replica",
        "Plan": null,
        "Warn": null
      },
      {
        "SQL": "set @@session.tidb_isolation_read_engines = 'tikv';",
        "Plan": null,
        "Warn": null
      },
      {
        "SQL": "explain select count(*) from t where a=1 -- 3. isolation_engine not match",
        "Plan": [
          "StreamAgg_17 1.00 root  funcs:count(Column#8)->Column#6",
          "└─IndexReader_18 1.00 root  index:StreamAgg_9",
          "  └─StreamAgg_9 1.00 cop[tikv]  funcs:count(1)->Column#8",
          "    └─IndexRangeScan_16 10.00 cop[tikv] table:t, index:idx(a) range:[1,1], keep order:false, stats:pseudo"
        ],
        "Warn": [
          "MPP mode may be blocked because 'tidb_isolation_read_engines'(value: 'tikv') not match, need 'tiflash'."
        ]
      },
      {
        "SQL": "set @@session.tidb_isolation_read_engines = 'tikv, tiflash';",
        "Plan": null,
        "Warn": null
      },
      {
        "SQL": "explain format = 'brief' select /*+ read_from_storage(tikv[t]) */ count(*) from t where a=1 -- 4. hint use tikv",
        "Plan": [
          "StreamAgg 1.00 root  funcs:count(Column#8)->Column#6",
          "└─IndexReader 1.00 root  index:StreamAgg",
          "  └─StreamAgg 1.00 cop[tikv]  funcs:count(1)->Column#8",
          "    └─IndexRangeScan 10.00 cop[tikv] table:t, index:idx(a) range:[1,1], keep order:false, stats:pseudo"
        ],
        "Warn": [
          "MPP mode may be blocked because you have set a hint to read table `t` from TiKV."
        ]
      },
      {
        "SQL": "explain format = 'brief' SELECT a, ROW_NUMBER() OVER (ORDER BY a) FROM t; -- 5. window unsupported",
        "Plan": [
          "TableReader 10000.00 root  data:ExchangeSender",
          "└─ExchangeSender 10000.00 mpp[tiflash]  ExchangeType: PassThrough",
          "  └─Window 10000.00 mpp[tiflash]  row_number()->Column#7 over(order by test.t.a rows between current row and current row)",
          "    └─Sort 10000.00 mpp[tiflash]  test.t.a",
          "      └─ExchangeReceiver 10000.00 mpp[tiflash]  ",
          "        └─ExchangeSender 10000.00 mpp[tiflash]  ExchangeType: PassThrough",
          "          └─TableFullScan 10000.00 mpp[tiflash] table:t keep order:false, stats:pseudo"
        ],
        "Warn": null
      },
      {
        "SQL": "EXPLAIN format = 'brief' SELECT t1.b FROM t t1 join t t2 where t1.a=t2.a; -- 6. virtual column",
        "Plan": [
          "HashJoin 12487.50 root  inner join, equal:[eq(test.t.a, test.t.a)]",
          "├─TableReader(Build) 9990.00 root  data:Selection",
          "│ └─Selection 9990.00 cop[tiflash]  not(isnull(test.t.a))",
          "│   └─TableFullScan 10000.00 cop[tiflash] table:t2 keep order:false, stats:pseudo",
          "└─TableReader(Probe) 9990.00 root  data:Selection",
          "  └─Selection 9990.00 cop[tiflash]  not(isnull(test.t.a))",
          "    └─TableFullScan 10000.00 cop[tiflash] table:t1 keep order:false, stats:pseudo"
        ],
        "Warn": [
          "MPP mode may be blocked because column `test.t.b` is a virtual column which is not supported now."
        ]
      },
      {
        "SQL": "EXPLAIN format = 'brief' SELECT count(b) from t where a=1; -- 7. agg func has virtual column",
        "Plan": [
          "StreamAgg 1.00 root  funcs:count(test.t.b)->Column#6",
          "└─IndexLookUp 10.00 root  ",
          "  ├─IndexRangeScan(Build) 10.00 cop[tikv] table:t, index:idx(a) range:[1,1], keep order:false, stats:pseudo",
          "  └─TableRowIDScan(Probe) 10.00 cop[tikv] table:t keep order:false, stats:pseudo"
        ],
        "Warn": [
          "Aggregation can not be pushed to tiflash because expressions of AggFunc `count` contain virtual column or correlated column, which is not supported now",
          "Aggregation can not be pushed to tiflash because expressions of AggFunc `count` contain virtual column or correlated column, which is not supported now",
          "Aggregation can not be pushed to tikv because expressions of AggFunc `count` contain virtual column or correlated column, which is not supported now",
          "Aggregation can not be pushed to tiflash because expressions of AggFunc `count` contain virtual column or correlated column, which is not supported now",
          "Aggregation can not be pushed to tiflash because expressions of AggFunc `count` contain virtual column or correlated column, which is not supported now"
        ]
      },
      {
        "SQL": "EXPLAIN format = 'brief' SELECT count(*) from t group by b; -- 8. group by virtual column",
        "Plan": [
          "HashAgg 8000.00 root  group by:test.t.b, funcs:count(1)->Column#6",
          "└─Projection 10000.00 root  test.t.b",
          "  └─TableReader 10000.00 root  data:TableFullScan",
          "    └─TableFullScan 10000.00 cop[tiflash] table:t keep order:false, stats:pseudo"
        ],
        "Warn": [
          "Aggregation can not be pushed to tiflash because groupByItems contain virtual columns, which is not supported now",
          "Aggregation can not be pushed to tiflash because groupByItems contain virtual columns, which is not supported now",
          "Aggregation can not be pushed to tiflash because groupByItems contain virtual columns, which is not supported now"
        ]
      },
      {
        "SQL": "EXPLAIN format = 'brief' SELECT count(a) from t group by md5(a); -- 10. scalar func not supported",
        "Plan": [
          "HashAgg 8000.00 root  group by:Column#8, funcs:count(Column#7)->Column#6",
          "└─Projection 10000.00 root  test.t.a, md5(cast(test.t.a, var_string(20)))->Column#8",
          "  └─TableReader 10000.00 root  data:TableFullScan",
          "    └─TableFullScan 10000.00 cop[tiflash] table:t keep order:false, stats:pseudo"
        ],
        "Warn": [
          "Scalar function 'md5'(signature: MD5, return type: var_string(32)) is not supported to push down to tiflash now.",
          "Aggregation can not be pushed to tiflash because groupByItems contain unsupported exprs",
          "Scalar function 'md5'(signature: MD5, return type: var_string(32)) is not supported to push down to tiflash now.",
          "Aggregation can not be pushed to tiflash because groupByItems contain unsupported exprs",
          "Scalar function 'md5'(signature: MD5, return type: var_string(32)) is not supported to push down to tiflash now.",
          "Aggregation can not be pushed to tiflash because groupByItems contain unsupported exprs"
        ]
      },
      {
        "SQL": "EXPLAIN format = 'brief' SELECT count(a) from t where c=1; -- 11. type not supported",
        "Plan": [
          "StreamAgg 1.00 root  funcs:count(test.t.a)->Column#6",
          "└─Selection 10.00 root  eq(test.t.c, 1)",
          "  └─TableReader 10000.00 root  data:TableFullScan",
          "    └─TableFullScan 10000.00 cop[tiflash] table:t keep order:false, stats:pseudo"
        ],
        "Warn": [
          "Expression about 'test.t.c' can not be pushed to TiFlash because it contains unsupported calculation of type 'enum'.",
          "Expression about 'test.t.c' can not be pushed to TiFlash because it contains unsupported calculation of type 'enum'.",
          "Expression about 'test.t.c' can not be pushed to TiFlash because it contains unsupported calculation of type 'enum'.",
          "Expression about 'test.t.c' can not be pushed to TiFlash because it contains unsupported calculation of type 'enum'.",
          "Expression about 'test.t.c' can not be pushed to TiFlash because it contains unsupported calculation of type 'enum'."
        ]
      },
      {
        "SQL": "EXPLAIN format = 'brief' SELECT count(a) from t where d=1; -- 11.1. type not supported",
        "Plan": [
          "StreamAgg 1.00 root  funcs:count(test.t.a)->Column#6",
          "└─Selection 10.00 root  eq(test.t.d, 1)",
          "  └─TableReader 10000.00 root  data:TableFullScan",
          "    └─TableFullScan 10000.00 cop[tiflash] table:t keep order:false, stats:pseudo"
        ],
        "Warn": [
          "Expression about 'test.t.d' can not be pushed to TiFlash because it contains unsupported calculation of type 'bit'.",
          "Expression about 'test.t.d' can not be pushed to TiFlash because it contains unsupported calculation of type 'bit'.",
          "Expression about 'test.t.d' can not be pushed to TiFlash because it contains unsupported calculation of type 'bit'.",
          "Expression about 'test.t.d' can not be pushed to TiFlash because it contains unsupported calculation of type 'bit'.",
          "Expression about 'test.t.d' can not be pushed to TiFlash because it contains unsupported calculation of type 'bit'."
        ]
      }
    ]
  },
  {
    "Name": "TestEnforceMPPWarning2",
    "Cases": [
      {
        "SQL": "set @@tidb_allow_mpp=1;set @@tidb_enforce_mpp=1;",
        "Plan": null,
        "Warn": null
      },
      {
        "SQL": "set @@tidb_partition_prune_mode=static;",
        "Plan": null,
        "Warn": null
      },
      {
        "SQL": "EXPLAIN SELECT count(*) from t where a=1; -- 1. static partition prune",
        "Plan": [
          "StreamAgg_32 1.00 root  funcs:count(Column#6)->Column#4",
          "└─TableReader_33 1.00 root  data:StreamAgg_13",
          "  └─StreamAgg_13 1.00 batchCop[tiflash]  funcs:count(1)->Column#6",
          "    └─Selection_31 10.00 batchCop[tiflash]  eq(test.t.a, 1)",
          "      └─TableFullScan_30 10000.00 batchCop[tiflash] table:t, partition:p0 keep order:false, stats:pseudo"
        ],
        "Warn": [
          "MPP mode may be blocked because table `t`is a partition table which is not supported when `@@tidb_partition_prune_mode=static`."
        ]
      },
      {
        "SQL": "set @@tidb_partition_prune_mode=dynamic;",
        "Plan": null,
        "Warn": null
      }
    ]
  },
  {
    "Name": "TestEnforceMPPWarning3",
    "Cases": [
      {
        "SQL": "set @@tidb_allow_mpp=1;set @@tidb_enforce_mpp=1;set @@tidb_hash_exchange_with_new_collation=0;",
        "Plan": null,
        "Warn": null
      },
      {
        "SQL": "cmd: enable-new-collation",
        "Plan": null,
        "Warn": null
      },
      {
        "SQL": "EXPLAIN SELECT count(*) from t group by b; -- 1. new collation FIXME",
        "Plan": [
          "HashAgg_24 8000.00 root  group by:test.t.b, funcs:count(Column#7)->Column#4",
          "└─TableReader_26 8000.00 root  data:ExchangeSender_25",
          "  └─ExchangeSender_25 8000.00 mpp[tiflash]  ExchangeType: PassThrough",
          "    └─HashAgg_11 8000.00 mpp[tiflash]  group by:test.t.b, funcs:count(1)->Column#7",
          "      └─TableFullScan_21 10000.00 mpp[tiflash] table:t keep order:false, stats:pseudo"
        ],
        "Warn": [
          "MPP mode may be blocked because when `new_collation_enabled` is true, HashJoin or HashAgg with string key is not supported now.",
          "MPP mode may be blocked because when `new_collation_enabled` is true, HashJoin or HashAgg with string key is not supported now.",
          "MPP mode may be blocked because when `new_collation_enabled` is true, HashJoin or HashAgg with string key is not supported now."
        ]
      },
      {
        "SQL": "EXPLAIN SELECT * from t t1 join t t2 on t1.b=t2.b; -- 2. new collation FIXME",
        "Plan": [
          "TableReader_34 12487.50 root  data:ExchangeSender_33",
          "└─ExchangeSender_33 12487.50 mpp[tiflash]  ExchangeType: PassThrough",
          "  └─HashJoin_32 12487.50 mpp[tiflash]  inner join, equal:[eq(test.t.b, test.t.b)]",
          "    ├─ExchangeReceiver_15(Build) 9990.00 mpp[tiflash]  ",
          "    │ └─ExchangeSender_14 9990.00 mpp[tiflash]  ExchangeType: Broadcast",
          "    │   └─Selection_13 9990.00 mpp[tiflash]  not(isnull(test.t.b))",
          "    │     └─TableFullScan_12 10000.00 mpp[tiflash] table:t1 keep order:false, stats:pseudo",
          "    └─Selection_17(Probe) 9990.00 mpp[tiflash]  not(isnull(test.t.b))",
          "      └─TableFullScan_16 10000.00 mpp[tiflash] table:t2 keep order:false, stats:pseudo"
        ],
        "Warn": null
      }
    ]
  },
  {
    "Name": "TestEnforceMPPWarning4",
    "Cases": [
      {
        "SQL": "set @@tidb_allow_mpp=1;set @@tidb_enforce_mpp=1; -- test joins",
        "Plan": null,
        "Warn": null
      },
      {
        "SQL": "EXPLAIN SELECT /*+ MERGE_JOIN(t,s) */ * from t join s using(a); -- 1. hint use MERGE_JOIN",
        "Plan": [
          "MergeJoin_8 12500.00 root  inner join, left key:test.t.a, right key:test.s.a",
          "├─TableReader_18(Build) 10000.00 root  data:TableFullScan_17",
          "│ └─TableFullScan_17 10000.00 cop[tiflash] table:s keep order:true, stats:pseudo",
          "└─TableReader_14(Probe) 10000.00 root  data:TableFullScan_13",
          "  └─TableFullScan_13 10000.00 cop[tiflash] table:t keep order:true, stats:pseudo"
        ],
        "Warn": [
          "MPP mode may be blocked because you have used hint to specify a join algorithm which is not supported by mpp now.",
          "MPP mode may be blocked because you have used hint to specify a join algorithm which is not supported by mpp now."
        ]
      },
      {
        "SQL": "EXPLAIN SELECT /*+ INL_JOIN(t,s) */ * from t, s where t.a=s.a; -- 2. hint use INL_JOIN",
        "Plan": [
          "IndexJoin_15 12500.00 root  inner join, inner:TableReader_12, outer key:test.t.a, inner key:test.s.a, equal cond:eq(test.t.a, test.s.a)",
          "├─TableReader_32(Build) 10000.00 root  data:TableFullScan_31",
          "│ └─TableFullScan_31 10000.00 cop[tiflash] table:t keep order:false, stats:pseudo",
          "└─TableReader_12(Probe) 1.00 root  data:TableRangeScan_11",
          "  └─TableRangeScan_11 1.00 cop[tikv] table:s range: decided by [test.t.a], keep order:false, stats:pseudo"
        ],
        "Warn": [
          "MPP mode may be blocked because you have used hint to specify a join algorithm which is not supported by mpp now.",
          "MPP mode may be blocked because you have used hint to specify a join algorithm which is not supported by mpp now."
        ]
      },
      {
        "SQL": "EXPLAIN SELECT /*+ INL_HASH_JOIN(t,s) */ * from t join s using(a); -- 3. hint use INL_HASH_JOIN",
        "Plan": [
          "IndexHashJoin_16 12500.00 root  inner join, inner:TableReader_11, outer key:test.t.a, inner key:test.s.a, equal cond:eq(test.t.a, test.s.a)",
          "├─TableReader_31(Build) 10000.00 root  data:TableFullScan_30",
          "│ └─TableFullScan_30 10000.00 cop[tiflash] table:t keep order:false, stats:pseudo",
          "└─TableReader_11(Probe) 1.00 root  data:TableRangeScan_10",
          "  └─TableRangeScan_10 1.00 cop[tikv] table:s range: decided by [test.t.a], keep order:false, stats:pseudo"
        ],
        "Warn": [
          "MPP mode may be blocked because you have used hint to specify a join algorithm which is not supported by mpp now.",
          "MPP mode may be blocked because you have used hint to specify a join algorithm which is not supported by mpp now."
        ]
      },
      {
        "SQL": "EXPLAIN SELECT /*+ HASH_JOIN(t,s) */ * from t join s using(a); -- 4. hint use INL_JOIN",
        "Plan": [
          "HashJoin_28 12500.00 root  inner join, equal:[eq(test.t.a, test.s.a)]",
          "├─TableReader_37(Build) 10000.00 root  data:TableFullScan_36",
          "│ └─TableFullScan_36 10000.00 cop[tiflash] table:s keep order:false, stats:pseudo",
          "└─TableReader_33(Probe) 10000.00 root  data:TableFullScan_32",
          "  └─TableFullScan_32 10000.00 cop[tiflash] table:t keep order:false, stats:pseudo"
        ],
        "Warn": [
          "MPP mode may be blocked because you have used hint to specify a join algorithm which is not supported by mpp now.",
          "MPP mode may be blocked because you have used hint to specify a join algorithm which is not supported by mpp now."
        ]
      },
      {
        "SQL": "set @@tidb_opt_broadcast_cartesian_join = 0",
        "Plan": null,
        "Warn": null
      },
      {
        "SQL": "EXPLAIN SELECT * from t join s; -- 5. cartesian join, cartesian banned.",
        "Plan": [
          "HashJoin_8 100000000.00 root  CARTESIAN inner join",
          "├─TableReader_17(Build) 10000.00 root  data:TableFullScan_16",
          "│ └─TableFullScan_16 10000.00 cop[tiflash] table:s keep order:false, stats:pseudo",
          "└─TableReader_13(Probe) 10000.00 root  data:TableFullScan_12",
          "  └─TableFullScan_12 10000.00 cop[tiflash] table:t keep order:false, stats:pseudo"
        ],
        "Warn": [
          "MPP mode may be blocked because `Cartesian Product` is only supported by broadcast join, check value and documents of variable `tidb_opt_broadcast_cartesian_join`.",
          "MPP mode may be blocked because `Cartesian Product` is only supported by broadcast join, check value and documents of variable `tidb_opt_broadcast_cartesian_join`."
        ]
      },
      {
        "SQL": "set @@tidb_broadcast_join_threshold_size = 0; set @@tidb_opt_broadcast_cartesian_join = 1",
        "Plan": null,
        "Warn": null
      },
      {
        "SQL": "EXPLAIN SELECT * from t join s; -- 6. cartesian join, broadcast banned.",
        "Plan": [
          "HashJoin_8 100000000.00 root  CARTESIAN inner join",
          "├─TableReader_17(Build) 10000.00 root  data:TableFullScan_16",
          "│ └─TableFullScan_16 10000.00 cop[tiflash] table:s keep order:false, stats:pseudo",
          "└─TableReader_13(Probe) 10000.00 root  data:TableFullScan_12",
          "  └─TableFullScan_12 10000.00 cop[tiflash] table:t keep order:false, stats:pseudo"
        ],
        "Warn": [
          "MPP mode may be blocked because `Cartesian Product` is only supported by broadcast join, check value and documents of variables `tidb_broadcast_join_threshold_size` and `tidb_broadcast_join_threshold_count`.",
          "MPP mode may be blocked because `Cartesian Product` is only supported by broadcast join, check value and documents of variables `tidb_broadcast_join_threshold_size` and `tidb_broadcast_join_threshold_count`."
        ]
      },
      {
        "SQL": "set @@tidb_broadcast_join_threshold_size = 104857600; set @@tidb_opt_broadcast_cartesian_join = 1",
        "Plan": null,
        "Warn": null
      },
      {
        "SQL": "EXPLAIN SELECT * from t join s; -- can use mpp",
        "Plan": [
          "TableReader_27 100000000.00 root  data:ExchangeSender_26",
          "└─ExchangeSender_26 100000000.00 mpp[tiflash]  ExchangeType: PassThrough",
          "  └─HashJoin_25 100000000.00 mpp[tiflash]  CARTESIAN inner join",
          "    ├─ExchangeReceiver_13(Build) 10000.00 mpp[tiflash]  ",
          "    │ └─ExchangeSender_12 10000.00 mpp[tiflash]  ExchangeType: Broadcast",
          "    │   └─TableFullScan_11 10000.00 mpp[tiflash] table:t keep order:false, stats:pseudo",
          "    └─TableFullScan_14(Probe) 10000.00 mpp[tiflash] table:s keep order:false, stats:pseudo"
        ],
        "Warn": null
      },
      {
        "SQL": "set @@tidb_broadcast_join_threshold_size = 0; set @@tidb_opt_broadcast_cartesian_join = 2",
        "Plan": null,
        "Warn": null
      },
      {
        "SQL": "EXPLAIN SELECT * from t join s; -- can use mpp",
        "Plan": [
          "TableReader_27 100000000.00 root  data:ExchangeSender_26",
          "└─ExchangeSender_26 100000000.00 mpp[tiflash]  ExchangeType: PassThrough",
          "  └─HashJoin_25 100000000.00 mpp[tiflash]  CARTESIAN inner join",
          "    ├─ExchangeReceiver_13(Build) 10000.00 mpp[tiflash]  ",
          "    │ └─ExchangeSender_12 10000.00 mpp[tiflash]  ExchangeType: Broadcast",
          "    │   └─TableFullScan_11 10000.00 mpp[tiflash] table:t keep order:false, stats:pseudo",
          "    └─TableFullScan_14(Probe) 10000.00 mpp[tiflash] table:s keep order:false, stats:pseudo"
        ],
        "Warn": null
      },
      {
        "SQL": "set @@tidb_broadcast_join_threshold_size = 104857600; set @@tidb_opt_broadcast_cartesian_join = 1;",
        "Plan": null,
        "Warn": null
      },
      {
        "SQL": "explain select a from t where t.a>1 or t.a in (select a from t); -- 7. left outer semi join",
        "Plan": [
          "TableReader_48 8000.00 root  data:ExchangeSender_47",
          "└─ExchangeSender_47 8000.00 mpp[tiflash]  ExchangeType: PassThrough",
          "  └─Projection_8 8000.00 mpp[tiflash]  test.t.a",
          "    └─Selection_45 8000.00 mpp[tiflash]  or(gt(test.t.a, 1), Column#3)",
          "      └─HashJoin_46 10000.00 mpp[tiflash]  left outer semi join, equal:[eq(test.t.a, test.t.a)]",
          "        ├─ExchangeReceiver_26(Build) 10000.00 mpp[tiflash]  ",
          "        │ └─ExchangeSender_25 10000.00 mpp[tiflash]  ExchangeType: Broadcast",
          "        │   └─TableFullScan_24 10000.00 mpp[tiflash] table:t keep order:false, stats:pseudo",
          "        └─TableFullScan_23(Probe) 10000.00 mpp[tiflash] table:t keep order:false, stats:pseudo"
        ],
        "Warn": null
      },
      {
        "SQL": "explain select a from t where t.a>1 or t.a not in (select a from t); -- now it's supported -- 8. anti left outer semi join",
        "Plan": [
          "TableReader_48 8000.00 root  data:ExchangeSender_47",
          "└─ExchangeSender_47 8000.00 mpp[tiflash]  ExchangeType: PassThrough",
          "  └─Projection_8 8000.00 mpp[tiflash]  test.t.a",
          "    └─Selection_45 8000.00 mpp[tiflash]  or(gt(test.t.a, 1), Column#3)",
          "      └─HashJoin_46 10000.00 mpp[tiflash]  anti left outer semi join, equal:[eq(test.t.a, test.t.a)]",
          "        ├─ExchangeReceiver_26(Build) 10000.00 mpp[tiflash]  ",
          "        │ └─ExchangeSender_25 10000.00 mpp[tiflash]  ExchangeType: Broadcast",
          "        │   └─TableFullScan_24 10000.00 mpp[tiflash] table:t keep order:false, stats:pseudo",
          "        └─TableFullScan_23(Probe) 10000.00 mpp[tiflash] table:t keep order:false, stats:pseudo"
        ],
        "Warn": null
      },
      {
        "SQL": "explain select a from t where t.a not in (select a from s where t.a<1); -- 9. non left join has left conditions",
        "Plan": [
          "MergeJoin_10 8000.00 root  anti semi join, left key:test.t.a, right key:test.s.a, left cond:[lt(test.t.a, 1)]",
          "├─TableReader_29(Build) 10000.00 root  data:TableFullScan_28",
          "│ └─TableFullScan_28 10000.00 cop[tiflash] table:s keep order:true, stats:pseudo",
          "└─TableReader_25(Probe) 10000.00 root  data:TableFullScan_24",
          "  └─TableFullScan_24 10000.00 cop[tiflash] table:t keep order:true, stats:pseudo"
        ],
        "Warn": [
          "MPP mode may be blocked because there is a join that is not `left join` but has left conditions, which is not supported by mpp now, see github.com/pingcap/tidb/issues/26090 for more information.",
          "MPP mode may be blocked because there is a join that is not `left join` but has left conditions, which is not supported by mpp now, see github.com/pingcap/tidb/issues/26090 for more information."
        ]
      }
    ]
  },
  {
    "Name": "TestMPP2PhaseAggPushDown",
    "Cases": [
      {
        "SQL": "set @@tidb_allow_mpp=1;set @@tidb_enforce_mpp=1;set @@tidb_opt_agg_push_down=1;",
        "Plan": null,
        "Warn": null
      },
      {
        "SQL": "EXPLAIN select count(*) from c, o where c.c_id=o.c_id; -- 1. test agg push down, scalar aggregate",
        "Plan": [
          "HashAgg_13 1.00 root  funcs:count(Column#7)->Column#6",
          "└─TableReader_35 9990.00 root  data:ExchangeSender_34",
          "  └─ExchangeSender_34 9990.00 mpp[tiflash]  ExchangeType: PassThrough",
          "    └─HashJoin_14 9990.00 mpp[tiflash]  inner join, equal:[eq(test.c.c_id, test.o.c_id)]",
          "      ├─ExchangeReceiver_26(Build) 8000.00 mpp[tiflash]  ",
          "      │ └─ExchangeSender_25 8000.00 mpp[tiflash]  ExchangeType: Broadcast",
          "      │   └─Projection_24 8000.00 mpp[tiflash]  Column#7, test.o.c_id",
          "      │     └─HashAgg_19 8000.00 mpp[tiflash]  group by:test.o.c_id, funcs:count(1)->Column#7, funcs:firstrow(test.o.c_id)->test.o.c_id",
          "      │       └─ExchangeReceiver_23 10000.00 mpp[tiflash]  ",
          "      │         └─ExchangeSender_22 10000.00 mpp[tiflash]  ExchangeType: HashPartition, Hash Cols: [name: test.o.c_id, collate: binary]",
          "      │           └─TableFullScan_21 10000.00 mpp[tiflash] table:o keep order:false, stats:pseudo",
          "      └─Selection_18(Probe) 9990.00 mpp[tiflash]  not(isnull(test.c.c_id))",
          "        └─TableFullScan_17 10000.00 mpp[tiflash] table:c keep order:false, stats:pseudo"
        ],
        "Warn": null
      },
      {
        "SQL": "EXPLAIN select o.o_id, count(*) from c, o where c.c_id=o.c_id group by o.o_id; -- 2. test agg push down, group by non-join column",
        "Plan": [
          "TableReader_78 8000.00 root  data:ExchangeSender_77",
          "└─ExchangeSender_77 8000.00 mpp[tiflash]  ExchangeType: PassThrough",
          "  └─Projection_10 8000.00 mpp[tiflash]  test.o.o_id, Column#6",
          "    └─Projection_76 8000.00 mpp[tiflash]  Column#6, test.o.o_id",
          "      └─HashAgg_75 8000.00 mpp[tiflash]  group by:test.o.o_id, funcs:count(Column#7)->Column#6, funcs:firstrow(Column#8)->test.o.o_id",
          "        └─ExchangeReceiver_71 9990.00 mpp[tiflash]  ",
          "          └─ExchangeSender_70 9990.00 mpp[tiflash]  ExchangeType: HashPartition, Hash Cols: [name: test.o.o_id, collate: binary]",
          "            └─HashJoin_69 9990.00 mpp[tiflash]  inner join, equal:[eq(test.c.c_id, test.o.c_id)]",
          "              ├─ExchangeReceiver_27(Build) 8000.00 mpp[tiflash]  ",
          "              │ └─ExchangeSender_26 8000.00 mpp[tiflash]  ExchangeType: Broadcast",
          "              │   └─Projection_25 8000.00 mpp[tiflash]  Column#7, Column#8, test.o.o_id, test.o.c_id",
          "              │     └─HashAgg_20 8000.00 mpp[tiflash]  group by:test.o.c_id, test.o.o_id, funcs:count(1)->Column#7, funcs:firstrow(test.o.o_id)->Column#8, funcs:firstrow(test.o.o_id)->test.o.o_id, funcs:firstrow(test.o.c_id)->test.o.c_id",
          "              │       └─ExchangeReceiver_24 10000.00 mpp[tiflash]  ",
          "              │         └─ExchangeSender_23 10000.00 mpp[tiflash]  ExchangeType: HashPartition, Hash Cols: [name: test.o.o_id, collate: binary], [name: test.o.c_id, collate: binary]",
          "              │           └─TableFullScan_22 10000.00 mpp[tiflash] table:o keep order:false, stats:pseudo",
          "              └─Selection_19(Probe) 9990.00 mpp[tiflash]  not(isnull(test.c.c_id))",
          "                └─TableFullScan_18 10000.00 mpp[tiflash] table:c keep order:false, stats:pseudo"
        ],
        "Warn": null
      },
      {
        "SQL": "EXPLAIN select o.c_id, count(*) from c, o where c.c_id=o.c_id group by o.c_id; -- 3. test agg push down, group by join column",
        "Plan": [
          "TableReader_78 8000.00 root  data:ExchangeSender_77",
          "└─ExchangeSender_77 8000.00 mpp[tiflash]  ExchangeType: PassThrough",
          "  └─Projection_10 8000.00 mpp[tiflash]  test.o.c_id, Column#6",
          "    └─Projection_76 8000.00 mpp[tiflash]  Column#6, test.o.c_id",
          "      └─HashAgg_75 8000.00 mpp[tiflash]  group by:test.o.c_id, funcs:count(Column#7)->Column#6, funcs:firstrow(Column#8)->test.o.c_id",
          "        └─ExchangeReceiver_71 9990.00 mpp[tiflash]  ",
          "          └─ExchangeSender_70 9990.00 mpp[tiflash]  ExchangeType: HashPartition, Hash Cols: [name: test.o.c_id, collate: binary]",
          "            └─HashJoin_69 9990.00 mpp[tiflash]  inner join, equal:[eq(test.c.c_id, test.o.c_id)]",
          "              ├─ExchangeReceiver_27(Build) 8000.00 mpp[tiflash]  ",
          "              │ └─ExchangeSender_26 8000.00 mpp[tiflash]  ExchangeType: Broadcast",
          "              │   └─Projection_25 8000.00 mpp[tiflash]  Column#7, Column#8, test.o.c_id",
          "              │     └─HashAgg_20 8000.00 mpp[tiflash]  group by:test.o.c_id, funcs:count(1)->Column#7, funcs:firstrow(test.o.c_id)->Column#8, funcs:firstrow(test.o.c_id)->test.o.c_id",
          "              │       └─ExchangeReceiver_24 10000.00 mpp[tiflash]  ",
          "              │         └─ExchangeSender_23 10000.00 mpp[tiflash]  ExchangeType: HashPartition, Hash Cols: [name: test.o.c_id, collate: binary]",
          "              │           └─TableFullScan_22 10000.00 mpp[tiflash] table:o keep order:false, stats:pseudo",
          "              └─Selection_19(Probe) 9990.00 mpp[tiflash]  not(isnull(test.c.c_id))",
          "                └─TableFullScan_18 10000.00 mpp[tiflash] table:c keep order:false, stats:pseudo"
        ],
        "Warn": null
      }
    ]
  }
]