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dbt-expectations

dbt-expectations is an extension package for dbt, inspired by the Great Expectations package for Python. The intent is to allow dbt users to deploy GE-like tests in their data warehouse directly from dbt, vs having to add another integration with their data warehouse.

Install

dbt-expectations currently supports dbt 0.20.x.

Check dbt Hub for the latest installation instructions, or read the docs for more information on installing packages.

Include in packages.yml

packages:
  - package: calogica/dbt_expectations
    version: [">=0.4.0", "<0.5.0"]
    # <see https://github.com/calogica/dbt-expectations/releases/latest> for the latest version tag

For latest release, see https://github.com/calogica/dbt-expectations/releases

Dependencies

This package includes a reference to dbt-date which in turn references dbt-utils so there's no need to also import dbt-utils in your local project.

Note: we no longer include spark_utils in this package to avoid versioning conflicts. If you are running this package on non-core (Snowflake, BigQuery, Redshift, Postgres) platforms, you will need to use a package like spark_utils to shim macros.

For example, in packages.yml, you will need to include the relevant package:

  - package: fishtown-analytics/spark_utils
    version: <latest or range>

And reference in the dispatch list for dbt_utils in dbt_project.yml:

vars:
    dbt_utils_dispatch_list: [spark_utils]

Variables

The following variables need to be defined in your dbt_project.yml file:

vars:
  'dbt_date:time_zone': 'America/Los_Angeles'

You may specify any valid timezone string in place of America/Los_Angeles. For example, use America/New_York for East Coast Time.

Integration Tests (Developers Only)

This project contains integration tests for all test macros in a separate integration_tests dbt project contained in this repo.

To run the tests:

  1. You will need a profile called integration_tests in ~/.dbt/profiles.yml pointing to a writable database.
  2. Then, from within the integration_tests folder, run dbt seed to load data_test.csv to the test schema of your database.
  3. Then run dbt test to run the tests specified in integration_tests/models/schema_tests/schema.yml

Available Tests

Table shape

Missing values, unique values, and types

Sets and ranges

String matching

Aggregate functions

Multi-column

Distributional functions

Documentation

expect_column_to_exist

Expect the specified column to exist.

Applies to: Column

tests:
- dbt_expectations.expect_column_to_exist

expect_row_values_to_have_recent_data

Expect the model to have rows that are at least as recent as the defined interval prior to the current timestamp.

Applies to: Column

tests:
  - dbt_expectations.expect_row_values_to_have_recent_data:
        datepart: day
        interval: 1

expect_grouped_row_values_to_have_recent_data

Expect the model to have grouped rows that are at least as recent as the defined interval prior to the current timestamp. Use this to test whether there is recent data for each grouped row defined by group_by (which is a list of columns) and a timestamp_column.

Applies to: Model, Seed, Source

models: # or seeds:
  - name : my_model
    tests :
        - dbt_expectations.expect_grouped_row_values_to_have_recent_data:
            group_by: [group_id]
            timestamp_column: date_day
            datepart: day
            interval: 1
        # or also:
        - dbt_expectations.expect_grouped_row_values_to_have_recent_data:
            group_by: [group_id, other_group_id]
            timestamp_column: date_day
            datepart: day
            interval: 1

expect_table_column_count_to_be_between

Expect the number of columns in a model to be between two values.

Applies to: Column

tests:
  - dbt_expectations.expect_table_column_count_to_be_between:
      min_value: 1 # (Optional)
      max_value: 4 # (Optional)

expect_table_column_count_to_equal_other_table

Expect the number of columns in a model to match another model.

Applies to: Model, Seed, Source

models: # or seeds:
  - name: my_model
    tests:
    - dbt_expectations.expect_table_column_count_to_equal_other_table:
        compare_model: ref("other_model")

expect_table_column_count_to_equal

Expect the number of columns in a model to be equal to expected_number_of_columns.

Applies to: Model, Seed, Source

models: # or seeds:
  - name: my_model
    tests:
    - dbt_expectations.expect_table_column_count_to_equal:
        value: 7

expect_table_columns_to_match_ordered_list

Expect the columns to exactly match a specified list.

Applies to: Model, Seed, Source

models: # or seeds:
  - name: my_model
    tests:
    - dbt_expectations.expect_table_columns_to_match_ordered_list:
        column_list: ["col_a", "col_b"]

expect_table_columns_to_match_set

Expect the columns in a model to match a given list.

Applies to: Model, Seed, Source

models: # or seeds:
  - name: my_model
    tests:
    - dbt_expectations.expect_table_columns_to_match_set:
        column_list: ["col_a", "col_b"]

expect_table_row_count_to_be_between

Expect the number of rows in a model to be between two values. Applies to: Model, Seed, Source

models: # or seeds:
  - name: my_model
    tests:
    - dbt_expectations.expect_table_row_count_to_be_between:
        min_value: 1 # (Optional)
        max_value: 4 # (Optional)

expect_table_row_count_to_equal_other_table

Expect the number of rows in a model match another model.

Applies to: Model, Seed, Source

models: # or seeds:
  - name: my_model
    tests:
    - dbt_expectations.expect_table_row_count_to_equal_other_table:
        compare_model: ref("other_model")

expect_table_row_count_to_equal_other_table_times_factor

Expect the number of rows in a model to match another model times a preconfigured factor.

Applies to: Model, Seed, Source

models: # or seeds:
  - name: my_model
    tests:
    - dbt_expectations.expect_table_column_count_to_equal_other_table_times_factor:
        compare_model: ref("other_model")
        factor: 13

expect_table_row_count_to_equal

Expect the number of rows in a model to be equal to expected_number_of_rows.

Applies to: Model, Seed, Source

models: # or seeds:
  - name: my_model
    tests:
    - dbt_expectations.expect_table_row_count_to_equal:
        value: 4

expect_column_values_to_be_unique

Expect each column value to be unique.

Applies to: Column

tests:
  - dbt_expectations.expect_column_values_to_be_unique

expect_column_values_to_not_be_null

Expect column values to not be null.

Applies to: Column

tests:
  - dbt_expectations.expect_column_values_to_not_be_null

expect_column_values_to_be_null

Expect column values to be null.

Applies to: Column

tests:
  - dbt_expectations.expect_column_values_to_be_null

expect_column_values_to_be_of_type

Expect a column to be of a specified data type.

Applies to: Column

tests:
  - dbt_expectations.expect_column_values_to_be_of_type:
      column_type: date

expect_column_values_to_be_in_type_list

Expect a column to be one of a specified type list.

Applies to: Column

tests:
  - dbt_expectations.expect_column_values_to_be_in_type_list:
      column_type_list: [date, datetime]

expect_column_values_to_be_in_set

Expect each column value to be in a given set.

Applies to: Column

tests:
  - dbt_expectations.expect_column_values_to_be_in_set:
      value_set: ['a','b','c']

expect_column_values_to_be_between

Expect each column value to be between two values.

Applies to: Column

tests:
  - dbt_expectations.expect_column_values_to_be_between:
      min_value: 0  # (Optional)
      max_value: 10 # (Optional)

expect_column_values_to_not_be_in_set

Expect each column value not to be in a given set.

Applies to: Column

tests:
  - dbt_expectations.expect_column_values_to_not_be_in_set:
      value_set: ['e','f','g']

expect_column_values_to_be_increasing

Expect column values to be increasing.

If strictly: True, then this expectation is only satisfied if each consecutive value is strictly increasing–equal values are treated as failures.

Applies to: Column

tests:
  - dbt_expectations.expect_column_values_to_be_increasing:
      sort_column: date_day

expect_column_values_to_be_decreasing

Expect column values to be decreasing.

If strictly=True, then this expectation is only satisfied if each consecutive value is strictly increasing–equal values are treated as failures.

Applies to: Column

tests:
  - dbt_expectations.expect_column_values_to_be_decreasing:
      sort_column: col_numeric_a
      strictly: false

expect_column_value_lengths_to_be_between

Expect column entries to be strings with length between a min_value value and a max_value value (inclusive).

Applies to: Column

tests:
  - dbt_expectations.expect_column_value_lengths_to_be_between:
      min_value: 1 # (Optional)
      max_value: 4 # (Optional)

expect_column_value_lengths_to_equal

Expect column entries to be strings with length equal to the provided value.

Applies to: Column

tests:
  - dbt_expectations.expect_column_value_lengths_to_equal:
      value: 10

expect_column_values_to_match_regex

Expect column entries to be strings that match a given regular expression. Valid matches can be found anywhere in the string, for example "[at]+" will identify the following strings as expected: "cat", "hat", "aa", "a", and "t", and the following strings as unexpected: "fish", "dog".

Applies to: Column

tests:
  - dbt_expectations.expect_column_values_to_match_regex:
      regex: "[at]+"

expect_column_values_to_not_match_regex

Expect column entries to be strings that do NOT match a given regular expression. The regex must not match any portion of the provided string. For example, "[at]+" would identify the following strings as expected: "fish”, "dog”, and the following as unexpected: "cat”, "hat”.

Applies to: Column

tests:
  - dbt_expectations.expect_column_values_to_not_match_regex:
      regex: "[at]+"

expect_column_values_to_match_regex_list

Expect the column entries to be strings that can be matched to either any of or all of a list of regular expressions. Matches can be anywhere in the string.

Applies to: Column

tests:
  - dbt_expectations.expect_column_values_to_match_regex_list:
      regex_list: ["@[^.]*", "&[^.]*"]

expect_column_values_to_not_match_regex_list

Expect the column entries to be strings that do not match any of a list of regular expressions. Matches can be anywhere in the string.

Applies to: Column

tests:
  - dbt_expectations.expect_column_values_to_not_match_regex_list:
      regex_list: ["@[^.]*", "&[^.]*"]

expect_column_values_to_match_like_pattern

Expect column entries to be strings that match a given SQL like pattern.

Applies to: Column

tests:
  - dbt_expectations.expect_column_values_to_match_like_pattern:
      like_pattern: "%@%"

expect_column_values_to_not_match_like_pattern

Expect column entries to be strings that do not match a given SQL like pattern.

Applies to: Column

tests:
  - dbt_expectations.expect_column_values_to_not_match_like_pattern:
      like_pattern: "%&%"

expect_column_values_to_match_like_pattern_list

Expect the column entries to be strings that match any of a list of SQL like patterns.

Applies to: Column

tests:
  - dbt_expectations.expect_column_values_to_match_like_pattern_list:
      like_pattern_list: ["%@%", "%&%"]

expect_column_values_to_not_match_like_pattern_list

Expect the column entries to be strings that do not match any of a list of SQL like patterns.

Applies to: Column

tests:
  - dbt_expectations.expect_column_values_to_not_match_like_pattern_list:
      like_pattern_list: ["%@%", "%&%"]

expect_column_distinct_count_to_equal

Expect the number of distinct column values to be equal to a given value.

Applies to: Column

tests:
  - dbt_expectations.expect_column_distinct_count_to_equal:
      value: 10

expect_column_distinct_count_to_be_greater_than

Expect the number of distinct column values to be greater than a given value.

Applies to: Column

tests:
  - dbt_expectations.expect_column_distinct_count_to_be_greater_than:
      value: 10

expect_column_distinct_values_to_be_in_set

Expect the set of distinct column values to be contained by a given set.

Applies to: Column

tests:
  - dbt_expectations.expect_column_distinct_values_to_be_in_set:
      value_set: ['a','b','c','d']

expect_column_distinct_values_to_contain_set

Expect the set of distinct column values to contain a given set.

In contrast to expect_column_values_to_be_in_set this ensures not that all column values are members of the given set but that values from the set must be present in the column.

Applies to: Column

tests:
  - dbt_expectations.expect_column_distinct_values_to_contain_set:
      value_set: ['a','b']

expect_column_distinct_values_to_equal_set

Expect the set of distinct column values to equal a given set.

In contrast to expect_column_distinct_values_to_contain_set this ensures not only that a certain set of values are present in the column but that these and only these values are present.

Applies to: Column

tests:
  - dbt_expectations.expect_column_distinct_values_to_equal_set:
      value_set: ['a','b','c']

expect_column_distinct_count_to_equal_other_table

Expect the number of distinct column values to be equal to number of distinct values in another model.

Applies to: Model, Column, Seed, Source

This can be applied to a model:

models: # or seeds:
  - name: my_model_1
    tests:
      - dbt_expectations.expect_column_distinct_count_to_equal_other_table:
          column_name: col_1
          compare_model: ref("my_model_2")
          compare_column_name: col_2

or at the column level:

models: # or seeds:
  - name: my_model_1
    columns:
      - name: col_1
        tests:
          - dbt_expectations.expect_column_distinct_count_to_equal_other_table:
              compare_model: ref("my_model_2")
              compare_column_name: col_2

If compare_model or compare_column_name are no specified, model and column_name are substituted. So, one could compare distinct counts of two different columns in the same model, or identically named columns in separate models etc.

expect_column_mean_to_be_between

Expect the column mean to be between a min_value value and a max_value value (inclusive).

Applies to: Column

tests:
  - dbt_expectations.expect_column_mean_to_be_between:
      min_value: 0 # (Optional)
      max_value: 2 # (Optional)

expect_column_median_to_be_between

Expect the column median to be between a min_value value and a max_value value (inclusive).

Applies to: Column

tests:
  - dbt_expectations.expect_column_median_to_be_between:
      min_value: 0
      max_value: 2

expect_column_quantile_values_to_be_between

Expect specific provided column quantiles to be between provided min_value and max_value values.

Applies to: Column

tests:
  - dbt_expectations.expect_column_quantile_values_to_be_between:
      quantile: .95
      min_value: 0 # (Optional)
      max_value: 2 # (Optional)

expect_column_stdev_to_be_between

Expect the column standard deviation to be between a min_value value and a max_value value. Uses sample standard deviation (normalized by N-1).

Applies to: Column

tests:
  - dbt_expectations.expect_column_stdev_to_be_between:
      min_value: 0 # (Optional)
      max_value: 2 # (Optional)

expect_column_unique_value_count_to_be_between

Expect the number of unique values to be between a min_value value and a max_value value.

Applies to: Column

tests:
  - dbt_expectations.expect_column_unique_value_count_to_be_between:
      min_value: 3 # (Optional)
      max_value: 3 # (Optional)

expect_column_proportion_of_unique_values_to_be_between

Expect the proportion of unique values to be between a min_value value and a max_value value.

For example, in a column containing [1, 2, 2, 3, 3, 3, 4, 4, 4, 4], there are 4 unique values and 10 total values for a proportion of 0.4.

Applies to: Column

tests:
  - dbt_expectations.expect_column_proportion_of_unique_values_to_be_between:
      min_value: 0  # (Optional)
      max_value: .4 # (Optional)

expect_column_most_common_value_to_be_in_set

Expect the most common value to be within the designated value set

Applies to: Column

tests:
  - dbt_expectations.expect_column_most_common_value_to_be_in_set:
      value_set: [0.5]
      top_n: 1

expect_column_max_to_be_between

Expect the column max to be between a min and max value

Applies to: Column

tests:
  - dbt_expectations.expect_column_max_to_be_between:
      min_value: 1 # (Optional)
      max_value: 1 # (Optional)

expect_column_min_to_be_between

Expect the column min to be between a min and max value

Applies to: Column

tests:
  - dbt_expectations.expect_column_min_to_be_between:
      min_value: 0 # (Optional)
      max_value: 1 # (Optional)

expect_column_sum_to_be_between

Expect the column to sum to be between a min and max value

Applies to: Column

tests:
  - dbt_expectations.expect_column_sum_to_be_between:
      min_value: 1 # (Optional)
      max_value: 2 # (Optional)

expect_column_pair_values_A_to_be_greater_than_B

Expect values in column A to be greater than column B.

Applies to: Model, Seed, Source

tests:
  - dbt_expectations.expect_column_pair_values_A_to_be_greater_than_B:
      column_A: col_numeric_a
      column_B: col_numeric_a
      or_equal: True

expect_column_pair_values_to_be_equal

Expect the values in column A to be the same as column B.

Applies to: Model, Seed, Source

tests:
  - dbt_expectations.expect_column_pair_values_to_be_equal:
      column_A: col_numeric_a
      column_B: col_numeric_a

expect_column_pair_values_to_be_in_set

Expect paired values from columns A and B to belong to a set of valid pairs.

Note: value pairs are expressed as lists within lists

Applies to: Model, Seed, Source

tests:
  - dbt_expectations.expect_column_pair_values_to_be_in_set:
      column_A: col_numeric_a
      column_B: col_numeric_b
      value_pairs_set: [[0, 1], [1, 0], [0.5, 0.5], [0.5, 0.5]]

expect_select_column_values_to_be_unique_within_record

Expect the values for each record to be unique across the columns listed. Note that records can be duplicated.

Applies to: Model, Seed, Source

tests:
  - dbt_expectations.expect_select_column_values_to_be_unique_within_record:
      column_list: ["col_string_a", "col_string_b"]
      ignore_row_if: "any_value_is_missing"

expect_multicolumn_sum_to_equal

Expects that sum of all rows for a set of columns is equal to a specific value

Applies to: Model, Seed, Source

tests:
  - dbt_expectations.expect_multicolumn_sum_to_equal:
      column_list: ["col_numeric_a", "col_numeric_b"]
      sum_total: 4

expect_compound_columns_to_be_unique

Expect that the columns are unique together, e.g. a multi-column primary key.

Applies to: Model, Seed, Source

tests:
  - dbt_expectations.expect_compound_columns_to_be_unique:
      column_list: ["date_col", "col_string_b"]
      ignore_row_if: "any_value_is_missing"

expect_column_values_to_be_within_n_moving_stdevs

Expects changes in metric values to be within Z sigma away from a moving average, taking the (optionally logged) differences of an aggregated metric value and comparing it to its value N days ago.

Applies to: Column

tests:
  - dbt_expectations.expect_column_values_to_be_within_n_moving_stdevs:
      date_column_name: date
      period: day
      lookback_periods: 1
      trend_periods: 7
      test_periods: 14
      sigma_threshold: 3
      take_logs: true

expect_column_values_to_be_within_n_stdevs

Expects (optionally grouped & summed) metric values to be within Z sigma away from the column average

Applies to: Column

tests:
  - dbt_expectations.expect_column_values_to_be_within_n_stdevs:
      group_by: date_day
      sigma_threshold: 3

expect_row_values_to_have_data_for_every_n_datepart

Expects model to have values for every grouped date_part.

For example, this tests whether a model has data for every day (grouped on date_col) from either a specified start_date and end_date, or for the min/max value of the specified date_col.

Applies to: Model, Seed, Source

tests:
    - dbt_expectations.expect_row_values_to_have_data_for_every_n_datepart:
        date_col: date_day
        date_part: day