Add support for new TDIGEST features and changes (#2392)

* Add support to TDIGEST

* linters

* linters

* linters

* disable View Test Results in CI

7 files changed, 229 insertions, 88 deletions

diff --git a/.github/workflows/integration.yaml b/.github/workflows/integration.yaml
index c1110b1..4812f8a 100644
--- a/.github/workflows/integration.yaml
+++ b/.github/workflows/integration.yaml
@@ -71,21 +71,21 @@ jobs:
          with:
            name: pytest-results-${{matrix.test-type}}
            path: '${{matrix.test-type}}*results.xml'
-       - name: View Test Results
-         uses: dorny/test-reporter@v1
-         if: success() || failure()
-         with:
-           name: Test Results ${{matrix.python-version}} ${{matrix.test-type}}-${{matrix.connection-type}}
-           path: '${{matrix.test-type}}*results.xml'
-           reporter: java-junit
-           list-suites: failed
-           list-tests: failed
-           max-annotations: 10
-       - name: Upload codecov coverage
-         uses: codecov/codecov-action@v2
-         with:
-           fail_ci_if_error: false
-           token: ${{ secrets.CODECOV_TOKEN }}
+      #  - name: View Test Results
+      #    uses: dorny/test-reporter@v1
+      #    if: success() || failure()
+      #    with:
+      #      name: Test Results ${{matrix.python-version}} ${{matrix.test-type}}-${{matrix.connection-type}}
+      #      path: '${{matrix.test-type}}*results.xml'
+      #      reporter: java-junit
+      #      list-suites: failed
+      #      list-tests: failed
+      #      max-annotations: 10
+      #  - name: Upload codecov coverage
+      #    uses: codecov/codecov-action@v2
+      #    with:
+      #      fail_ci_if_error: false
+      #      token: ${{ secrets.CODECOV_TOKEN }}
 
    build_and_test_package:
     name: Validate building and installing the package
diff --git a/redis/commands/bf/__init__.py b/redis/commands/bf/__init__.py
index e41354b..a448def 100644
--- a/redis/commands/bf/__init__.py
+++ b/redis/commands/bf/__init__.py
@@ -3,7 +3,6 @@ from redis.client import bool_ok
 from ..helpers import parse_to_list
 from .commands import *  # noqa
 from .info import BFInfo, CFInfo, CMSInfo, TDigestInfo, TopKInfo
-from .utils import parse_tdigest_quantile
 
 
 class AbstractBloom(object):
@@ -166,12 +165,16 @@ class TDigestBloom(TDigestCommands, AbstractBloom):
             # TDIGEST_RESET: bool_ok,
             # TDIGEST_ADD: spaceHolder,
             # TDIGEST_MERGE: spaceHolder,
-            TDIGEST_CDF: float,
-            TDIGEST_QUANTILE: parse_tdigest_quantile,
+            TDIGEST_CDF: parse_to_list,
+            TDIGEST_QUANTILE: parse_to_list,
             TDIGEST_MIN: float,
             TDIGEST_MAX: float,
             TDIGEST_TRIMMED_MEAN: float,
             TDIGEST_INFO: TDigestInfo,
+            TDIGEST_RANK: parse_to_list,
+            TDIGEST_REVRANK: parse_to_list,
+            TDIGEST_BYRANK: parse_to_list,
+            TDIGEST_BYREVRANK: parse_to_list,
         }
 
         self.client = client
diff --git a/redis/commands/bf/commands.py b/redis/commands/bf/commands.py
index 3d085e6..71c9c8a 100644
--- a/redis/commands/bf/commands.py
+++ b/redis/commands/bf/commands.py
@@ -52,7 +52,10 @@ TDIGEST_MIN = "TDIGEST.MIN"
 TDIGEST_MAX = "TDIGEST.MAX"
 TDIGEST_INFO = "TDIGEST.INFO"
 TDIGEST_TRIMMED_MEAN = "TDIGEST.TRIMMED_MEAN"
-TDIGEST_MERGESTORE = "TDIGEST.MERGESTORE"
+TDIGEST_RANK = "TDIGEST.RANK"
+TDIGEST_REVRANK = "TDIGEST.REVRANK"
+TDIGEST_BYRANK = "TDIGEST.BYRANK"
+TDIGEST_BYREVRANK = "TDIGEST.BYREVRANK"
 
 
 class BFCommands:
@@ -381,12 +384,22 @@ class TDigestCommands:
         self.append_values_and_weights(params, values, weights)
         return self.execute_command(TDIGEST_ADD, *params)
 
-    def merge(self, toKey, fromKey):
+    def merge(self, destination_key, num_keys, *keys, compression=None, override=False):
         """
-        Merge all of the values from 'fromKey' to 'toKey' sketch.
+        Merges all of the values from `keys` to 'destination-key' sketch.
+        It is mandatory to provide the `num_keys` before passing the input keys and
+        the other (optional) arguments.
+        If `destination_key` already exists its values are merged with the input keys.
+        If you wish to override the destination key contents use the `OVERRIDE` parameter.
+
         For more information see `TDIGEST.MERGE <https://redis.io/commands/tdigest.merge>`_.
         """  # noqa
-        return self.execute_command(TDIGEST_MERGE, toKey, fromKey)
+        params = [destination_key, num_keys, *keys]
+        if compression is not None:
+            params.extend(["COMPRESSION", compression])
+        if override:
+            params.append("OVERRIDE")
+        return self.execute_command(TDIGEST_MERGE, *params)
 
     def min(self, key):
         """
@@ -411,12 +424,12 @@ class TDigestCommands:
         """  # noqa
         return self.execute_command(TDIGEST_QUANTILE, key, quantile, *quantiles)
 
-    def cdf(self, key, value):
+    def cdf(self, key, value, *values):
         """
         Return double fraction of all points added which are <= value.
         For more information see `TDIGEST.CDF <https://redis.io/commands/tdigest.cdf>`_.
         """  # noqa
-        return self.execute_command(TDIGEST_CDF, key, value)
+        return self.execute_command(TDIGEST_CDF, key, value, *values)
 
     def info(self, key):
         """
@@ -436,18 +449,39 @@ class TDigestCommands:
             TDIGEST_TRIMMED_MEAN, key, low_cut_quantile, high_cut_quantile
         )
 
-    def mergestore(self, dest_key, numkeys, *sourcekeys, compression=False):
+    def rank(self, key, value, *values):
         """
-        Merges all of the values from `sourcekeys` keys to `dest_key` sketch.
-        If destination already exists, it is overwritten.
+        Retrieve the estimated rank of value (the number of observations in the sketch
+        that are smaller than value + half the number of observations that are equal to value).
 
+        For more information see `TDIGEST.RANK <https://redis.io/commands/tdigest.rank>`_.
+        """  # noqa
+        return self.execute_command(TDIGEST_RANK, key, value, *values)
 
-        For more information see `TDIGEST.MERGESTORE <https://redis.io/commands/tdigest.mergestore>`_.
+    def revrank(self, key, value, *values):
+        """
+        Retrieve the estimated rank of value (the number of observations in the sketch
+        that are larger than value + half the number of observations that are equal to value).
+
+        For more information see `TDIGEST.REVRANK <https://redis.io/commands/tdigest.revrank>`_.
         """  # noqa
-        params = [dest_key, numkeys, *sourcekeys]
-        if compression:
-            params.extend(["COMPRESSION", compression])
-        return self.execute_command(TDIGEST_MERGESTORE, *params)
+        return self.execute_command(TDIGEST_REVRANK, key, value, *values)
+
+    def byrank(self, key, rank, *ranks):
+        """
+        Retrieve an estimation of the value with the given rank.
+
+        For more information see `TDIGEST.BY_RANK <https://redis.io/commands/tdigest.by_rank>`_.
+        """  # noqa
+        return self.execute_command(TDIGEST_BYRANK, key, rank, *ranks)
+
+    def byrevrank(self, key, rank, *ranks):
+        """
+        Retrieve an estimation of the value with the given reverse rank.
+
+        For more information see `TDIGEST.BY_REVRANK <https://redis.io/commands/tdigest.by_revrank>`_.
+        """  # noqa
+        return self.execute_command(TDIGEST_BYREVRANK, key, rank, *ranks)
 
 
 class CMSCommands:
diff --git a/redis/commands/bf/info.py b/redis/commands/bf/info.py
index 24c5419..c4d3e58 100644
--- a/redis/commands/bf/info.py
+++ b/redis/commands/bf/info.py
@@ -68,18 +68,22 @@ class TopKInfo(object):
 class TDigestInfo(object):
     compression = None
     capacity = None
-    mergedNodes = None
-    unmergedNodes = None
-    mergedWeight = None
-    unmergedWeight = None
-    totalCompressions = None
+    merged_nodes = None
+    unmerged_nodes = None
+    merged_weight = None
+    unmerged_weight = None
+    total_compressions = None
+    sum_weights = None
+    memory_usage = None
 
     def __init__(self, args):
         response = dict(zip(map(nativestr, args[::2]), args[1::2]))
         self.compression = response["Compression"]
         self.capacity = response["Capacity"]
-        self.mergedNodes = response["Merged nodes"]
-        self.unmergedNodes = response["Unmerged nodes"]
-        self.mergedWeight = response["Merged weight"]
-        self.unmergedWeight = response["Unmerged weight"]
-        self.totalCompressions = response["Total compressions"]
+        self.merged_nodes = response["Merged nodes"]
+        self.unmerged_nodes = response["Unmerged nodes"]
+        self.merged_weight = response["Merged weight"]
+        self.unmerged_weight = response["Unmerged weight"]
+        self.total_compressions = response["Total compressions"]
+        self.sum_weights = response["Sum weights"]
+        self.memory_usage = response["Memory usage"]
diff --git a/redis/commands/bf/utils.py b/redis/commands/bf/utils.py
deleted file mode 100644
index 21dcfa7..0000000
--- a/redis/commands/bf/utils.py
+++ /dev/null
@@ -1,3 +0,0 @@
-def parse_tdigest_quantile(response):
-    """Parse TDIGEST.QUANTILE response."""
-    return [float(x) for x in response]
diff --git a/tests/test_asyncio/test_bloom.py b/tests/test_asyncio/test_bloom.py
index 162a442..326924c 100644
--- a/tests/test_asyncio/test_bloom.py
+++ b/tests/test_asyncio/test_bloom.py
@@ -1,3 +1,5 @@
+from math import inf
+
 import pytest
 
 import redis.asyncio as redis
@@ -322,11 +324,11 @@ async def test_tdigest_reset(modclient: redis.Redis):
     # reset on empty histogram
     assert await modclient.tdigest().reset("tDigest")
     # insert data-points into sketch
-    assert await modclient.tdigest().add("tDigest", list(range(10)), [1.0] * 10)
+    assert await modclient.tdigest().add("tDigest", list(range(10)), [1] * 10)
 
     assert await modclient.tdigest().reset("tDigest")
     # assert we have 0 unmerged nodes
-    assert 0 == (await modclient.tdigest().info("tDigest")).unmergedNodes
+    assert 0 == (await modclient.tdigest().info("tDigest")).unmerged_nodes
 
 
 @pytest.mark.redismod
@@ -335,14 +337,24 @@ async def test_tdigest_merge(modclient: redis.Redis):
     assert await modclient.tdigest().create("to-tDigest", 10)
     assert await modclient.tdigest().create("from-tDigest", 10)
     # insert data-points into sketch
-    assert await modclient.tdigest().add("from-tDigest", [1.0] * 10, [1.0] * 10)
-    assert await modclient.tdigest().add("to-tDigest", [2.0] * 10, [10.0] * 10)
+    assert await modclient.tdigest().add("from-tDigest", [1.0] * 10, [1] * 10)
+    assert await modclient.tdigest().add("to-tDigest", [2.0] * 10, [10] * 10)
     # merge from-tdigest into to-tdigest
-    assert await modclient.tdigest().merge("to-tDigest", "from-tDigest")
+    assert await modclient.tdigest().merge("to-tDigest", 1, "from-tDigest")
     # we should now have 110 weight on to-histogram
     info = await modclient.tdigest().info("to-tDigest")
-    total_weight_to = float(info.mergedWeight) + float(info.unmergedWeight)
+    total_weight_to = float(info.merged_weight) + float(info.unmerged_weight)
     assert 110 == total_weight_to
+    # test override
+    assert await modclient.tdigest().create("from-override", 10)
+    assert await modclient.tdigest().create("from-override-2", 10)
+    assert await modclient.tdigest().add("from-override", [3.0] * 10, [10] * 10)
+    assert await modclient.tdigest().add("from-override-2", [4.0] * 10, [10] * 10)
+    assert await modclient.tdigest().merge(
+        "to-tDigest", 2, "from-override", "from-override-2", override=True
+    )
+    assert 3.0 == await modclient.tdigest().min("to-tDigest")
+    assert 4.0 == await modclient.tdigest().max("to-tDigest")
 
 
 @pytest.mark.redismod
@@ -350,7 +362,7 @@ async def test_tdigest_merge(modclient: redis.Redis):
 async def test_tdigest_min_and_max(modclient: redis.Redis):
     assert await modclient.tdigest().create("tDigest", 100)
     # insert data-points into sketch
-    assert await modclient.tdigest().add("tDigest", [1, 2, 3], [1.0] * 3)
+    assert await modclient.tdigest().add("tDigest", [1, 2, 3], [1] * 3)
     # min/max
     assert 3 == await modclient.tdigest().max("tDigest")
     assert 1 == await modclient.tdigest().min("tDigest")
@@ -363,12 +375,12 @@ async def test_tdigest_quantile(modclient: redis.Redis):
     assert await modclient.tdigest().create("tDigest", 500)
     # insert data-points into sketch
     assert await modclient.tdigest().add(
-        "tDigest", list([x * 0.01 for x in range(1, 10000)]), [1.0] * 10000
+        "tDigest", list([x * 0.01 for x in range(1, 10000)]), [1] * 10000
     )
     # assert min min/max have same result as quantile 0 and 1
     assert (
         await modclient.tdigest().max("tDigest")
-        == (await modclient.tdigest().quantile("tDigest", 1.0))[0]
+        == (await modclient.tdigest().quantile("tDigest", 1))[0]
     )
     assert (
         await modclient.tdigest().min("tDigest")
@@ -380,7 +392,7 @@ async def test_tdigest_quantile(modclient: redis.Redis):
 
     # test multiple quantiles
     assert await modclient.tdigest().create("t-digest", 100)
-    assert await modclient.tdigest().add("t-digest", [1, 2, 3, 4, 5], [1.0] * 5)
+    assert await modclient.tdigest().add("t-digest", [1, 2, 3, 4, 5], [1] * 5)
     res = await modclient.tdigest().quantile("t-digest", 0.5, 0.8)
     assert [3.0, 5.0] == res
 
@@ -390,22 +402,67 @@ async def test_tdigest_quantile(modclient: redis.Redis):
 async def test_tdigest_cdf(modclient: redis.Redis):
     assert await modclient.tdigest().create("tDigest", 100)
     # insert data-points into sketch
-    assert await modclient.tdigest().add("tDigest", list(range(1, 10)), [1.0] * 10)
-    assert 0.1 == round(await modclient.tdigest().cdf("tDigest", 1.0), 1)
-    assert 0.9 == round(await modclient.tdigest().cdf("tDigest", 9.0), 1)
+    assert await modclient.tdigest().add("tDigest", list(range(1, 10)), [1] * 10)
+    assert 0.1 == round((await modclient.tdigest().cdf("tDigest", 1.0))[0], 1)
+    assert 0.9 == round((await modclient.tdigest().cdf("tDigest", 9.0))[0], 1)
+    res = await modclient.tdigest().cdf("tDigest", 1.0, 9.0)
+    assert [0.1, 0.9] == [round(x, 1) for x in res]
 
 
 @pytest.mark.redismod
 @pytest.mark.experimental
 @skip_ifmodversion_lt("2.4.0", "bf")
-async def test_tdigest_mergestore(modclient: redis.Redis):
-    assert await modclient.tdigest().create("sourcekey1", 100)
-    assert await modclient.tdigest().create("sourcekey2", 100)
-    assert await modclient.tdigest().add("sourcekey1", [10], [1.0])
-    assert await modclient.tdigest().add("sourcekey2", [50], [1.0])
-    assert await modclient.tdigest().mergestore("dest", 2, "sourcekey1", "sourcekey2")
-    assert await modclient.tdigest().max("dest") == 50
-    assert await modclient.tdigest().min("dest") == 10
+async def test_tdigest_trimmed_mean(modclient: redis.Redis):
+    assert await modclient.tdigest().create("tDigest", 100)
+    # insert data-points into sketch
+    assert await modclient.tdigest().add("tDigest", list(range(1, 10)), [1] * 10)
+    assert 5 == await modclient.tdigest().trimmed_mean("tDigest", 0.1, 0.9)
+    assert 4.5 == await modclient.tdigest().trimmed_mean("tDigest", 0.4, 0.5)
+
+
+@pytest.mark.redismod
+@pytest.mark.experimental
+async def test_tdigest_rank(modclient: redis.Redis):
+    assert await modclient.tdigest().create("t-digest", 500)
+    assert await modclient.tdigest().add("t-digest", list(range(0, 20)), [1] * 20)
+    assert -1 == (await modclient.tdigest().rank("t-digest", -1))[0]
+    assert 1 == (await modclient.tdigest().rank("t-digest", 0))[0]
+    assert 11 == (await modclient.tdigest().rank("t-digest", 10))[0]
+    assert [-1, 20, 10] == await modclient.tdigest().rank("t-digest", -20, 20, 9)
+
+
+@pytest.mark.redismod
+@pytest.mark.experimental
+async def test_tdigest_revrank(modclient: redis.Redis):
+    assert await modclient.tdigest().create("t-digest", 500)
+    assert await modclient.tdigest().add("t-digest", list(range(0, 20)), [1] * 20)
+    assert -1 == (await modclient.tdigest().revrank("t-digest", 20))[0]
+    assert 20 == (await modclient.tdigest().revrank("t-digest", 0))[0]
+    assert [-1, 20, 10] == await modclient.tdigest().revrank("t-digest", 21, 0, 10)
+
+
+@pytest.mark.redismod
+@pytest.mark.experimental
+async def test_tdigest_byrank(modclient: redis.Redis):
+    assert await modclient.tdigest().create("t-digest", 500)
+    assert await modclient.tdigest().add("t-digest", list(range(1, 11)), [1] * 20)
+    assert 1 == (await modclient.tdigest().byrank("t-digest", 0))[0]
+    assert 10 == (await modclient.tdigest().byrank("t-digest", 9))[0]
+    assert (await modclient.tdigest().byrank("t-digest", 100))[0] == inf
+    with pytest.raises(redis.ResponseError):
+        (await modclient.tdigest().byrank("t-digest", -1))[0]
+
+
+@pytest.mark.redismod
+@pytest.mark.experimental
+async def test_tdigest_byrevrank(modclient: redis.Redis):
+    assert await modclient.tdigest().create("t-digest", 500)
+    assert await modclient.tdigest().add("t-digest", list(range(1, 11)), [1] * 20)
+    assert 10 == (await modclient.tdigest().byrevrank("t-digest", 0))[0]
+    assert 2 == (await modclient.tdigest().byrevrank("t-digest", 9))[0]
+    assert (await modclient.tdigest().byrevrank("t-digest", 100))[0] == -inf
+    with pytest.raises(redis.ResponseError):
+        (await modclient.tdigest().byrevrank("t-digest", -1))[0]
 
 
 # @pytest.mark.redismod
diff --git a/tests/test_bloom.py b/tests/test_bloom.py
index 54fcd69..1194140 100644
--- a/tests/test_bloom.py
+++ b/tests/test_bloom.py
@@ -1,3 +1,5 @@
+from math import inf
+
 import pytest
 
 import redis.commands.bf
@@ -337,11 +339,11 @@ def test_tdigest_reset(client):
     # reset on empty histogram
     assert client.tdigest().reset("tDigest")
     # insert data-points into sketch
-    assert client.tdigest().add("tDigest", list(range(10)), [1.0] * 10)
+    assert client.tdigest().add("tDigest", list(range(10)), [1] * 10)
 
     assert client.tdigest().reset("tDigest")
     # assert we have 0 unmerged nodes
-    assert 0 == client.tdigest().info("tDigest").unmergedNodes
+    assert 0 == client.tdigest().info("tDigest").unmerged_nodes
 
 
 @pytest.mark.redismod
@@ -350,14 +352,24 @@ def test_tdigest_merge(client):
     assert client.tdigest().create("to-tDigest", 10)
     assert client.tdigest().create("from-tDigest", 10)
     # insert data-points into sketch
-    assert client.tdigest().add("from-tDigest", [1.0] * 10, [1.0] * 10)
-    assert client.tdigest().add("to-tDigest", [2.0] * 10, [10.0] * 10)
+    assert client.tdigest().add("from-tDigest", [1.0] * 10, [1] * 10)
+    assert client.tdigest().add("to-tDigest", [2.0] * 10, [10] * 10)
     # merge from-tdigest into to-tdigest
-    assert client.tdigest().merge("to-tDigest", "from-tDigest")
+    assert client.tdigest().merge("to-tDigest", 1, "from-tDigest")
     # we should now have 110 weight on to-histogram
     info = client.tdigest().info("to-tDigest")
-    total_weight_to = float(info.mergedWeight) + float(info.unmergedWeight)
+    total_weight_to = float(info.merged_weight) + float(info.unmerged_weight)
     assert 110 == total_weight_to
+    # test override
+    assert client.tdigest().create("from-override", 10)
+    assert client.tdigest().create("from-override-2", 10)
+    assert client.tdigest().add("from-override", [3.0] * 10, [10] * 10)
+    assert client.tdigest().add("from-override-2", [4.0] * 10, [10] * 10)
+    assert client.tdigest().merge(
+        "to-tDigest", 2, "from-override", "from-override-2", override=True
+    )
+    assert 3.0 == client.tdigest().min("to-tDigest")
+    assert 4.0 == client.tdigest().max("to-tDigest")
 
 
 @pytest.mark.redismod
@@ -365,7 +377,7 @@ def test_tdigest_merge(client):
 def test_tdigest_min_and_max(client):
     assert client.tdigest().create("tDigest", 100)
     # insert data-points into sketch
-    assert client.tdigest().add("tDigest", [1, 2, 3], [1.0] * 3)
+    assert client.tdigest().add("tDigest", [1, 2, 3], [1] * 3)
     # min/max
     assert 3 == client.tdigest().max("tDigest")
     assert 1 == client.tdigest().min("tDigest")
@@ -378,7 +390,7 @@ def test_tdigest_quantile(client):
     assert client.tdigest().create("tDigest", 500)
     # insert data-points into sketch
     assert client.tdigest().add(
-        "tDigest", list([x * 0.01 for x in range(1, 10000)]), [1.0] * 10000
+        "tDigest", list([x * 0.01 for x in range(1, 10000)]), [1] * 10000
     )
     # assert min min/max have same result as quantile 0 and 1
     res = client.tdigest().quantile("tDigest", 1.0)
@@ -391,7 +403,7 @@ def test_tdigest_quantile(client):
 
     # test multiple quantiles
     assert client.tdigest().create("t-digest", 100)
-    assert client.tdigest().add("t-digest", [1, 2, 3, 4, 5], [1.0] * 5)
+    assert client.tdigest().add("t-digest", [1, 2, 3, 4, 5], [1] * 5)
     assert [3.0, 5.0] == client.tdigest().quantile("t-digest", 0.5, 0.8)
 
 
@@ -400,9 +412,11 @@ def test_tdigest_quantile(client):
 def test_tdigest_cdf(client):
     assert client.tdigest().create("tDigest", 100)
     # insert data-points into sketch
-    assert client.tdigest().add("tDigest", list(range(1, 10)), [1.0] * 10)
-    assert 0.1 == round(client.tdigest().cdf("tDigest", 1.0), 1)
-    assert 0.9 == round(client.tdigest().cdf("tDigest", 9.0), 1)
+    assert client.tdigest().add("tDigest", list(range(1, 10)), [1] * 10)
+    assert 0.1 == round(client.tdigest().cdf("tDigest", 1.0)[0], 1)
+    assert 0.9 == round(client.tdigest().cdf("tDigest", 9.0)[0], 1)
+    res = client.tdigest().cdf("tDigest", 1.0, 9.0)
+    assert [0.1, 0.9] == [round(x, 1) for x in res]
 
 
 @pytest.mark.redismod
@@ -411,22 +425,54 @@ def test_tdigest_cdf(client):
 def test_tdigest_trimmed_mean(client):
     assert client.tdigest().create("tDigest", 100)
     # insert data-points into sketch
-    assert client.tdigest().add("tDigest", list(range(1, 10)), [1.0] * 10)
+    assert client.tdigest().add("tDigest", list(range(1, 10)), [1] * 10)
     assert 5 == client.tdigest().trimmed_mean("tDigest", 0.1, 0.9)
     assert 4.5 == client.tdigest().trimmed_mean("tDigest", 0.4, 0.5)
 
 
 @pytest.mark.redismod
 @pytest.mark.experimental
-@skip_ifmodversion_lt("2.4.0", "bf")
-def test_tdigest_mergestore(client):
-    assert client.tdigest().create("sourcekey1", 100)
-    assert client.tdigest().create("sourcekey2", 100)
-    assert client.tdigest().add("sourcekey1", [10], [1.0])
-    assert client.tdigest().add("sourcekey2", [50], [1.0])
-    assert client.tdigest().mergestore("destkey", 2, "sourcekey1", "sourcekey2")
-    assert client.tdigest().max("destkey") == 50
-    assert client.tdigest().min("destkey") == 10
+def test_tdigest_rank(client):
+    assert client.tdigest().create("t-digest", 500)
+    assert client.tdigest().add("t-digest", list(range(0, 20)), [1] * 20)
+    assert -1 == client.tdigest().rank("t-digest", -1)[0]
+    assert 1 == client.tdigest().rank("t-digest", 0)[0]
+    assert 11 == client.tdigest().rank("t-digest", 10)[0]
+    assert [-1, 20, 10] == client.tdigest().rank("t-digest", -20, 20, 9)
+
+
+@pytest.mark.redismod
+@pytest.mark.experimental
+def test_tdigest_revrank(client):
+    assert client.tdigest().create("t-digest", 500)
+    assert client.tdigest().add("t-digest", list(range(0, 20)), [1] * 20)
+    assert -1 == client.tdigest().revrank("t-digest", 20)[0]
+    assert 20 == client.tdigest().revrank("t-digest", 0)[0]
+    assert [-1, 20, 10] == client.tdigest().revrank("t-digest", 21, 0, 10)
+
+
+@pytest.mark.redismod
+@pytest.mark.experimental
+def test_tdigest_byrank(client):
+    assert client.tdigest().create("t-digest", 500)
+    assert client.tdigest().add("t-digest", list(range(1, 11)), [1] * 20)
+    assert 1 == client.tdigest().byrank("t-digest", 0)[0]
+    assert 10 == client.tdigest().byrank("t-digest", 9)[0]
+    assert client.tdigest().byrank("t-digest", 100)[0] == inf
+    with pytest.raises(redis.ResponseError):
+        client.tdigest().byrank("t-digest", -1)[0]
+
+
+@pytest.mark.redismod
+@pytest.mark.experimental
+def test_tdigest_byrevrank(client):
+    assert client.tdigest().create("t-digest", 500)
+    assert client.tdigest().add("t-digest", list(range(1, 11)), [1] * 20)
+    assert 10 == client.tdigest().byrevrank("t-digest", 0)[0]
+    assert 2 == client.tdigest().byrevrank("t-digest", 9)[0]
+    assert client.tdigest().byrevrank("t-digest", 100)[0] == -inf
+    with pytest.raises(redis.ResponseError):
+        client.tdigest().byrevrank("t-digest", -1)[0]
 
 
 # @pytest.mark.redismod