add Python API for sample deletion (#759)

apis/python/src/tiledbvcf/binding/libtiledbvcf.cc

@@ -134,6 +134,10 @@ PYBIND11_MODULE(libtiledbvcf, m) {
           "ingest_samples",
           &Writer::ingest_samples,
           py::call_guard<py::gil_scoped_release>())
+      .def(
+          "delete_samples",
+          &Writer::delete_samples,
+          py::call_guard<py::gil_scoped_release>())
       .def("get_schema_version", &Writer::get_schema_version)
       .def("set_tiledb_config", &Writer::set_tiledb_config)
       .def("set_sample_batch_size", &Writer::set_sample_batch_size)

apis/python/src/tiledbvcf/binding/writer.cc

@@ -232,6 +232,18 @@ void Writer::ingest_samples() {
   check_error(writer, tiledb_vcf_writer_store(writer));
 }
 
+void Writer::delete_samples(std::vector<std::string> samples_to_delete) {
+  std::vector<const char*> samples;
+  for (std::string& sample : samples_to_delete) {
+    samples.emplace_back(sample.c_str());
+  }
+
+  auto writer = ptr.get();
+  check_error(
+      writer,
+      tiledb_vcf_writer_delete_samples(writer, samples.data(), samples.size()));
+}
+
 void Writer::deleter(tiledb_vcf_writer_t* w) {
   tiledb_vcf_writer_free(&w);
 }

apis/python/src/tiledbvcf/binding/writer.h

@@ -162,6 +162,8 @@ class Writer {
 
   void ingest_samples();
 
+  void delete_samples(std::vector<std::string> samples);
+
   /** Returns schema version number of the TileDB VCF dataset */
   int32_t get_schema_version();
 

apis/python/src/tiledbvcf/dataset.py

@@ -851,6 +851,14 @@ def ingest_samples(
             self.writer.register_samples()
         self.writer.ingest_samples()
 
+    def delete_samples(
+        self,
+        sample_uris: List[str] = None,
+    ):
+        if self.mode != "w":
+            raise Exception("Dataset not open in write mode")
+        self.writer.delete_samples(sample_uris)
+
     def tiledb_stats(self) -> str:
         """
         Get TileDB stats as a string.

apis/python/tests/test_tiledbvcf.py

@@ -1197,15 +1197,8 @@ def test_ingest_mode_merged(tmp_path):
     assert ds.count(regions=["chrX:9032893-9032893"]) == 0
 
 
-# Ok to skip is missing bcftools in Windows CI job
-@pytest.mark.skipif(
-    os.environ.get("CI") == "true"
-    and platform.system() == "Windows"
-    and shutil.which("bcftools") is None,
-    reason="no bcftools",
-)
-def test_ingest_with_stats_v3(tmp_path):
-    # tiledbvcf.config_logging("debug")
+@pytest.fixture
+def test_stats_bgzipped_inputs(tmp_path):
     tmp_path_contents = os.listdir(tmp_path)
     if "stats" in tmp_path_contents:
         shutil.rmtree(os.path.join(tmp_path, "stats"))
@@ -1221,23 +1214,46 @@ def test_ingest_with_stats_v3(tmp_path):
             check=True,
         )
     bgzipped_inputs = glob.glob(os.path.join(tmp_path, "stats", "*.gz"))
-    # print(f"bgzipped inputs: {bgzipped_inputs}")
     for vcf_file in bgzipped_inputs:
         assert subprocess.run("bcftools index " + vcf_file, shell=True).returncode == 0
     if "outputs" in tmp_path_contents:
         shutil.rmtree(os.path.join(tmp_path, "outputs"))
     if "stats_test" in tmp_path_contents:
         shutil.rmtree(os.path.join(tmp_path, "stats_test"))
-    # tiledbvcf.config_logging("trace")
+    return bgzipped_inputs
+
+
+@pytest.fixture
+def test_stats_sample_names(test_stats_bgzipped_inputs):
+    assert len(test_stats_bgzipped_inputs) == 8
+    return [os.path.basename(file).split(".")[0] for file in test_stats_bgzipped_inputs]
+
+
+@pytest.fixture
+def test_stats_v3_ingestion(tmp_path, test_stats_bgzipped_inputs):
+    assert len(test_stats_bgzipped_inputs) == 8
+    # print(f"bgzipped inputs: {test_stats_bgzipped_inputs}")
     ds = tiledbvcf.Dataset(uri=os.path.join(tmp_path, "stats_test"), mode="w")
     ds.create_dataset(
         enable_variant_stats=True, enable_allele_count=True, variant_stats_version=3
     )
-    ds.ingest_samples(bgzipped_inputs)
+    ds.ingest_samples(test_stats_bgzipped_inputs)
     ds = tiledbvcf.Dataset(uri=os.path.join(tmp_path, "stats_test"), mode="r")
-    sample_names = [os.path.basename(file).split(".")[0] for file in bgzipped_inputs]
-    data_frame = ds.read(
-        samples=sample_names,
+    return ds
+
+
+# Ok to skip is missing bcftools in Windows CI job
+@pytest.mark.skipif(
+    os.environ.get("CI") == "true"
+    and platform.system() == "Windows"
+    and shutil.which("bcftools") is None,
+    reason="no bcftools",
+)
+def test_ingest_with_stats_v3(
+    tmp_path, test_stats_v3_ingestion, test_stats_sample_names
+):
+    data_frame = test_stats_v3_ingestion.read(
+        samples=test_stats_sample_names,
         attrs=["contig", "pos_start", "id", "qual", "info_TILEDB_IAF", "sample_name"],
         set_af_filter="<0.2",
     )
@@ -1249,8 +1265,8 @@ def test_ingest_with_stats_v3(tmp_path):
         data_frame[data_frame["sample_name"] == "second"]["info_TILEDB_IAF"].iloc[0][0]
         == 0.9375
     )
-    data_frame = ds.read(
-        samples=sample_names,
+    data_frame = test_stats_v3_ingestion.read(
+        samples=test_stats_sample_names,
         attrs=["contig", "pos_start", "id", "qual", "info_TILEDB_IAF", "sample_name"],
         scan_all_samples=True,
     )
@@ -1260,25 +1276,45 @@ def test_ingest_with_stats_v3(tmp_path):
         ]["info_TILEDB_IAF"].iloc[0][0]
         == 0.9375
     )
-    ds = tiledbvcf.Dataset(uri=os.path.join(tmp_path, "stats_test"), mode="r")
-    df = ds.read_variant_stats("chr1:1-10000")
+    df = test_stats_v3_ingestion.read_variant_stats("chr1:1-10000")
     assert df.shape == (13, 5)
     df = tiledbvcf.allele_frequency.read_allele_frequency(
         os.path.join(tmp_path, "stats_test"), "chr1:1-10000"
     )
     assert df.pos.is_monotonic_increasing
     df["an_check"] = (df.ac / df.af).round(0).astype("int32")
     assert df.an_check.equals(df.an)
-    df = ds.read_variant_stats("chr1:1-10000")
+    df = test_stats_v3_ingestion.read_variant_stats("chr1:1-10000")
     assert df.shape == (13, 5)
     df = df.to_pandas()
-    df = ds.read_allele_count("chr1:1-10000")
+    df = test_stats_v3_ingestion.read_allele_count("chr1:1-10000")
     assert df.shape == (7, 6)
     df = df.to_pandas()
     assert sum(df["pos"] == (0, 1, 1, 2, 2, 2, 3)) == 7
     assert sum(df["count"] == (8, 5, 3, 4, 2, 2, 1)) == 7
 
 
+@pytest.mark.skipif(
+    os.environ.get("CI") == "true"
+    and platform.system() == "Windows"
+    and shutil.which("bcftools") is None,
+    reason="no bcftools",
+)
+def test_delete_samples(tmp_path, test_stats_v3_ingestion, test_stats_sample_names):
+    #    assert test_stats_v3_ingestion.samples() == test_stats_sample_names
+    assert "second" in test_stats_sample_names
+    assert "fifth" in test_stats_sample_names
+    assert "third" in test_stats_sample_names
+    ds = tiledbvcf.Dataset(uri=os.path.join(tmp_path, "stats_test"), mode="w")
+    # tiledbvcf.config_logging("trace")
+    ds.delete_samples(["second", "fifth"])
+    ds = tiledbvcf.Dataset(uri=os.path.join(tmp_path, "stats_test"), mode="r")
+    sample_names = ds.samples()
+    assert "second" not in sample_names
+    assert "fifth" not in sample_names
+    assert "third" in sample_names
+
+
 # Ok to skip is missing bcftools in Windows CI job
 @pytest.mark.skipif(
     os.environ.get("CI") == "true"

libtiledbvcf/src/c_api/tiledbvcf.cc

@@ -1823,6 +1823,21 @@ int32_t tiledb_vcf_writer_set_variant_stats_version(
   return TILEDB_VCF_OK;
 }
 
+int32_t tiledb_vcf_writer_delete_samples(
+    tiledb_vcf_writer_t* writer, const char** samples, size_t nsamples) {
+  std::vector<std::string> encoded_samples;
+  for (size_t i = 0; i < nsamples; i++)
+    encoded_samples.emplace_back(samples[i]);
+  if (sanity_check(writer) == TILEDB_VCF_ERR)
+    return TILEDB_VCF_ERR;
+
+  if (SAVE_ERROR_CATCH(
+          writer, writer->writer_->delete_samples(encoded_samples)))
+    return TILEDB_VCF_ERR;
+
+  return TILEDB_VCF_OK;
+}
+
 /* ********************************* */
 /*               ERROR               */
 /* ********************************* */

libtiledbvcf/src/c_api/tiledbvcf.h

@@ -1706,6 +1706,16 @@ tiledb_vcf_writer_set_compression_level(tiledb_vcf_writer_t* writer, int level);
 TILEDBVCF_EXPORT int32_t tiledb_vcf_writer_set_variant_stats_version(
     tiledb_vcf_writer_t* writer, uint8_t version);
 
+/**
+ * Deletes samples from dataset
+ * @param writer VCF writer object
+ * @param samples samples to delete
+ * @param nsamples number of samples to delete
+ */
+TILEDBVCF_EXPORT int32_t tiledb_vcf_writer_delete_samples(
+
+    tiledb_vcf_writer_t* writer, const char** samples, size_t nsamples);
+
 /* ********************************* */
 /*               ERROR               */
 /* ********************************* */

libtiledbvcf/src/dataset/tiledbvcfdataset.cc

@@ -938,7 +938,9 @@ void TileDBVCFDataset::delete_samples(
     const std::vector<std::string>& sample_names,
     const std::vector<std::string>& tiledb_config) {
   // Open dataset in read mode, required before calling `sample_exists`.
-  open(uri);
+  if (!open_) {
+    open(uri, tiledb_config);
+  }
 
   // Define a function that deletes a sample from an array
   auto delete_sample = [&](Array& array, const std::string& sample) {

libtiledbvcf/src/write/writer.cc

@@ -1484,5 +1484,10 @@ void Writer::set_variant_stats_array_version(uint8_t version) {
   creation_params_.variant_stats_array_version = version;
 }
 
+void Writer::delete_samples(std::vector<std::string> samples) {
+  dataset_->delete_samples(
+      ingestion_params_.uri, samples, ingestion_params_.tiledb_config);
+}
+
 }  // namespace vcf
 }  // namespace tiledb

libtiledbvcf/src/write/writer.h

@@ -382,6 +382,11 @@ class Writer {
   /** Set variant stats array version */
   void set_variant_stats_array_version(uint8_t version);
 
+  /**
+   * @brief Delete samples from the writer's dataset.
+   */
+  void delete_samples(std::vector<std::string> samples);
+
  private:
   /* ********************************* */
   /*          PRIVATE ATTRIBUTES       */