Last tutorial example needs 'transaction__' prefix for 'is_large' dimension

[nathanjones4323]

Summary of change

This PR corrects the final tutorial example query to include the required transaction__ prefix for the is_large dimension. Without this prefix, the query produces an error, which could confuse users. The updated example ensures the query works as intended.

Output before change

>>> mf query --metrics transactions,transaction_usd_na --group-by metric_time,is_large --order metric_time --start-time 2022-03-20 --end-time 2022-04-01

⠹ Initiating query…
ERROR: Got errors while resolving the query.

Error #1:
Message:

The given input does not match any of the available group-by-items for
Measure('transactions'). Common issues are:

  * Incorrect names.
  * No valid join paths exist from the measure to the group-by-item.
    (fan-out join support is pending).
  * There are multiple matching join paths.
    (disambiguation support is pending).

Suggestions:
  [
    'transaction__is_large',
    'id_order',
    'transaction__ds__day',
    'transaction__id_order',
    'customer',
    'metric_time__day',
  ]

Query Input:

is_large

Issue Location:

[Resolve Query(['transactions', 'transaction_usd_na'])]
  -> [Resolve Metric('transactions')]
    -> [Resolve Measure('transactions')]

Error #1:
Message:

The given input does not match any of the available group-by-items for
Measure('transaction_amount_usd'). Common issues are:

  * Incorrect names.
  * No valid join paths exist from the measure to the group-by-item.
    (fan-out join support is pending).
  * There are multiple matching join paths.
    (disambiguation support is pending).

Suggestions:
  [
    'transaction__is_large',
    'id_order',
    'transaction__ds__day',
    'transaction__id_order',
    'customer',
    'metric_time__day',
  ]

Query Input:

is_large

Issue Location:

[Resolve Query(['transactions', 'transaction_usd_na'])]
  -> [Resolve Metric('transaction_usd_na')]
    -> [Resolve Measure('transaction_amount_usd')]

Log file: /Users/nathanjones/dbt/logs/metricflow.log

Output after change

mf query --metrics transactions,transaction_usd_na --group-by metric_time,transaction__is_large --order metric_time --start-time 2022-03-20 --end-time 2022-04-01

✔ Success 🦄 - query completed after 0.40 seconds
metric_time__day transaction__is_large transactions transaction_usd_na

---

2022-03-21T00:00:00 True 3 639.87
2022-03-22T00:00:00 True 3 522.68
2022-03-23T00:00:00 True 2 215.14
2022-03-25T00:00:00 True 3 66.60
2022-03-26T00:00:00 True 2 179.91
2022-03-27T00:00:00 True 2 316.98
2022-03-28T00:00:00 True 1 266.90
2022-03-29T00:00:00 True 2 None
2022-03-30T00:00:00 True 4 534.25
2022-03-31T00:00:00 True 5 1170.96
2022-04-01T00:00:00 True 1 100.40