dal_context: Fix cost ms not calculated correctly

[Xuanwo]

Signed-off-by: Xuanwo github@xuanwo.io

I hereby agree to the terms of the CLA available at: https://databend.rs/dev/policies/cla/

Summary

Fix cost ms not calculated correctly

Close #4256

Changelog

• Bug Fix

Test Plan

Unit Tests

Stateless Tests

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[mergify]

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[BohuTANG]

/lgtm

[Xuanwo]

Local test result: (the sql whole time: 6.95s)

           log_type: 2
       handler_type: MySQL
          tenant_id: admin
         cluster_id:
           sql_user: root
     sql_user_quota: UserQuota { max_cpu: 0, max_memory_in_bytes: 0, max_storage_in_bytes: 0 }
sql_user_privileges: UserGrantSet { entries: [GrantEntry { user: "root", host_pattern: "127.0.0.1", object: Global, privileges: BitFlags<UserPrivilegeType>(0b1111111101111, Usage | Select | Insert | Update | Delete | Create | Drop | Alter | Super | CreateUser | CreateRole | Grant) }], roles: {} }
           query_id: 4f908ce2-a087-4253-8114-76b333e40d04
         query_kind: SelectPlan
         query_text: select count(*) from test
         event_date: 2022-03-03
         event_time: 1646273687265
   current_database: default
          databases:
             tables:
            columns:
        projections:
       written_rows: 0
      written_bytes: 0
          scan_rows: 1000000000
         scan_bytes: 8000000000
  scan_byte_cost_ms: 1867
    scan_partitions: 1024
   total_partitions: 1024
        result_rows: 1
       result_bytes: 8
          cpu_usage: 32
       memory_usage: 2672
        client_info:
     client_address: Some(127.0.0.1:46716)
     exception_code: 0
     exception_text:
        stack_trace:
     server_version:
              extra: