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new dcee4ad ARROW-4859: [GLib] Add garrow_numeric_array_mean()
dcee4ad is described below
commit dcee4ad1c5f62df0265e26f59ec58ed85597ffa2
Author: Yosuke Shiro <yosuke.shiro...@gmail.com>
AuthorDate: Fri Mar 15 05:36:09 2019 +0900
ARROW-4859: [GLib] Add garrow_numeric_array_mean()
Author: Yosuke Shiro <yosuke.shiro...@gmail.com>
Closes #3889 from shiro615/glib-mean and squashes the following commits:
1d2abbf5 <Yosuke Shiro> Use assert_in_delta for floating point number
e4be5213 <Yosuke Shiro> Use 0.0 for double
dfff46be <Yosuke Shiro> Add garrow_numeric_array_mean()
---
c_glib/arrow-glib/basic-array.cpp | 27 +++++++++++++++++++++++++++
c_glib/arrow-glib/basic-array.h | 4 ++++
c_glib/test/test-numeric-array.rb | 26 ++++++++++++++++++++++++++
cpp/src/arrow/compute/api.h | 1 +
4 files changed, 58 insertions(+)
diff --git a/c_glib/arrow-glib/basic-array.cpp
b/c_glib/arrow-glib/basic-array.cpp
index 7409945..c201f9d 100644
--- a/c_glib/arrow-glib/basic-array.cpp
+++ b/c_glib/arrow-glib/basic-array.cpp
@@ -939,6 +939,33 @@ garrow_numeric_array_class_init(GArrowNumericArrayClass
*klass)
{
}
+/**
+ * garrow_numeric_array_mean:
+ * @array: A #GArrowNumericArray.
+ * @error: (nullable): Return location for a #GError or %NULL.
+ *
+ * Returns: The value of the computed mean.
+ *
+ * Since: 0.13.0
+ */
+gdouble
+garrow_numeric_array_mean(GArrowNumericArray *array,
+ GError **error)
+{
+ auto arrow_array = garrow_array_get_raw(GARROW_ARRAY(array));
+ auto memory_pool = arrow::default_memory_pool();
+ arrow::compute::FunctionContext context(memory_pool);
+ arrow::compute::Datum mean_datum;
+ auto status = arrow::compute::Mean(&context, arrow_array, &mean_datum);
+ if (garrow_error_check(error, status, "[numeric-array][mean]")) {
+ using ScalarType = typename
arrow::TypeTraits<arrow::DoubleType>::ScalarType;
+ auto arrow_numeric_scalar =
std::dynamic_pointer_cast<ScalarType>(mean_datum.scalar());
+ return arrow_numeric_scalar->value;
+ } else {
+ return 0.0;
+ }
+}
+
G_DEFINE_TYPE(GArrowInt8Array,
garrow_int8_array,
diff --git a/c_glib/arrow-glib/basic-array.h b/c_glib/arrow-glib/basic-array.h
index 592699d..1dde2f2 100644
--- a/c_glib/arrow-glib/basic-array.h
+++ b/c_glib/arrow-glib/basic-array.h
@@ -212,6 +212,10 @@ struct _GArrowNumericArrayClass
GArrowPrimitiveArrayClass parent_class;
};
+GARROW_AVAILABLE_IN_0_13
+gdouble garrow_numeric_array_mean(GArrowNumericArray *array,
+ GError **error);
+
#define GARROW_TYPE_INT8_ARRAY (garrow_int8_array_get_type())
G_DECLARE_DERIVABLE_TYPE(GArrowInt8Array,
garrow_int8_array,
diff --git a/c_glib/test/test-numeric-array.rb
b/c_glib/test/test-numeric-array.rb
new file mode 100644
index 0000000..d919d59
--- /dev/null
+++ b/c_glib/test/test-numeric-array.rb
@@ -0,0 +1,26 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+class TestNumericArray < Test::Unit::TestCase
+ include Helper::Buildable
+
+ def test_mean
+ array = build_double_array([1.1, 2.2, nil])
+ assert_in_delta(array.values.sum / 2,
+ array.mean)
+ end
+end
diff --git a/cpp/src/arrow/compute/api.h b/cpp/src/arrow/compute/api.h
index cd5f11e..42839ce 100644
--- a/cpp/src/arrow/compute/api.h
+++ b/cpp/src/arrow/compute/api.h
@@ -24,5 +24,6 @@
#include "arrow/compute/kernels/boolean.h" // IWYU pragma: export
#include "arrow/compute/kernels/cast.h" // IWYU pragma: export
#include "arrow/compute/kernels/hash.h" // IWYU pragma: export
+#include "arrow/compute/kernels/mean.h" // IWYU pragma: export
#endif // ARROW_COMPUTE_API_H
