The `local_region_num` in MPPTaskStatistics logging is wrong

[JaySon-Huang]

Bug Report

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1. Minimal reproduce step (Required)

2. What did you expect to see? (Required)

3. What did you see instead (Required)

[2023/12/29 00:40:41.829 +08:00] [INFO] [MPPTaskStatistics.cpp:138] ["{\"query_tso\":446636133861556226,\"task_id\":1,\"is_root\":false,\"sender_executor_id\":\"ExchangeSender_51\",\"executors\":[{\"id\":\"ExchangeSender_51\",\"type\":\"ExchangeSender\",\"children\":[\"HashAgg_47\"],\"outbound_rows\":15,\"outbound_blocks\":1,\"outbound_bytes\":2700,\"outbound_allocated_bytes\":6054,\"concurrency\":1,\"execution_time_ns\":3183997226,\"partition_num\":1,\"sender_target_task_ids\":[2],\"exchange_type\":\"Hash\",\"connection_details\":[{\"tunnel_id\":\"tunnel1+2\",\"sender_target_task_id\":2,\"sender_target_host\":\"10.2.12.81:9520\",\"is_local\":true,\"packets\":1,\"bytes\":26377}]},{\"id\":\"HashAgg_47\",\"type\":\"Agg\",\"children\":[\"Projection_57\"],\"outbound_rows\":15,\"outbound_blocks\":1,\"outbound_bytes\":2625,\"outbound_allocated_bytes\":5824,\"concurrency\":1,\"execution_time_ns\":3181997228},{\"id\":\"Projection_57\",\"type\":\"Projection\",\"children\":[\"TableFullScan_35\"],\"outbound_rows\":321641463,\"outbound_blocks\":11994,\"outbound_bytes\":24766392651,\"outbound_allocated_bytes\":28815589970,\"concurrency\":72,\"execution_time_ns\":2661997681},{\"id\":\"TableFullScan_35\",\"type\":\"TableScan\",\"children\":[],\"outbound_rows\":321641463,\"outbound_blocks\":11994,\"outbound_bytes\":23479826799,\"outbound_allocated_bytes\":32900678464,\"concurrency\":72,\"execution_time_ns\":2156998119,\"connection_details\":[{\"is_local\":true,\"packets\":0,\"bytes\":23479826799},{\"is_local\":false,\"packets\":0,\"bytes\":0}],\"scan_details\":{\"build_bitmap_time\":\"107084.878ms\",\"create_snapshot_time\":\"3.113ms\",\"create_stream_time\":\"129335.426ms\",\"delta_bytes\":638315925,\"delta_rows\":6719115,\"disagg_cache_hit_size\":0,\"disagg_cache_miss_size\":0,\"dmfile_read_time\":\"63607.359ms\",\"dmfile_scan_rows\":1916326703,\"dmfile_skip_rows\":78937719,\"late_materialization_skip_rows\":12677929,\"learner_read_time\":\"12.917ms\",\"local_region_num\":0,\"mvcc_input_bytes\":7888726886,\"mvcc_input_rows\":464042758,\"mvcc_skip_rows\":6653709,\"num_columns\":9,\"num_read_tasks\":587,\"num_segments\":587,\"read_bytes\":42982171024,\"read_mode\":\"Bitmap\",\"remote_region_num\":0}}],\"host\":\"10.2.12.81:9520\",\"task_init_timestamp\":1703781638606437000,\"task_start_timestamp\":1703781638647501000,\"task_end_timestamp\":1703781641829349000,\"compile_start_timestamp\":1703781638620016000,\"compile_end_timestamp\":1703781638647441000,\"read_wait_index_start_timestamp\":1703781638622464000,\"read_wait_index_end_timestamp\":1703781638634583000,\"local_input_bytes\":23479826799,\"remote_input_bytes\":0,\"output_bytes\":0,\"status\":\"FINISHED\",\"error_message\":\"\",\"cpu_ru\":28697.666666666668,\"read_ru\":655855.8811035156,\"memory_peak\":2061153151}"] [source="mpp_task_tracing MPP<gather_id:1, query_ts:1703781638601123926, local_query_id:503, server_id:374, start_ts:446636133861556226,task_id:1>"] [thread_id=594]
	   {
                 ...
		"scan_details": {
                         ...
			"local_region_num": 0,
			"remote_region_num": 0
		}
	}],

4. What is your TiFlash version? (Required)

7.1.4, 7.5.1