docstr: Should support both predefined and adhoc metrics.
docstr_tok: ["Should","support","both","predefined","and","adhoc","metrics","."]
code: def test_handle_metrics_field(self):
      """
      Should support both predefined and adhoc metrics.
      """
      self.login(username="admin")
      adhoc_metric = {
          "expressionType": "SIMPLE",
          "column": {"column_name": "num_boys", "type": "BIGINT(20)"},
          "aggregate": "SUM",
          "label": "Boys",
          "optionName": "metric_11",
      }
      payload = get_query_context("birth_names")
      payload["queries"][0]["metrics"] = [
          "sum__num",
          {"label": "abc"},
          adhoc_metric,
      ]
      query_context = ChartDataQueryContextSchema().load(payload)
      query_object = query_context.queries[0]
      self.assertEqual(
          query_object.metrics, ["sum__num", "abc", adhoc_metric]
      )
  
imports: import re
  import time
  from typing import Any
  import numpy
  import pandas
  import pytest
  from pandas import DateOffset
  from superset import db
  from superset.charts.schemas import ChartDataQueryContextSchema
  from superset.common.chart_data import ChartDataResultFormat, ChartDataResultType
  from superset.common.query_context import QueryContext
  from superset.common.query_context_factory import QueryContextFactory
  from superset.common.query_object import QueryObject
  from superset.connectors.sqla.models import SqlMetric
  from superset.daos.datasource import DatasourceDAO
  from superset.extensions import cache_manager
  from superset.superset_typing import AdhocColumn
  from superset.utils.core import AdhocMetricExpressionType, backend, DatasourceType, QueryStatus
  from superset.utils.pandas_postprocessing.utils import FLAT_COLUMN_SEPARATOR
  from tests.integration_tests.base_tests import SupersetTestCase
  from tests.integration_tests.conftest import only_postgresql, only_sqlite
  from tests.integration_tests.fixtures.birth_names_dashboard import load_birth_names_dashboard_with_slices, load_birth_names_data
  from tests.integration_tests.fixtures.query_context import get_query_context
label_desc: Use image node_id 8 for calling the TestQueryContext obj's underlying member method code with example usage: obj.test_handle_metrics_field() without return types