ARROW-17456: [Go] Mark the compute module as a separate sub-module (a…

…pache#13910)

I noticed looking at pkg.go.dev that there really isn't anyone who is using the existing `compute` module, which makes sense since it isn't really finished and only provides limited utility currently.

This change will mark the `compute` module as a separate sub-module inside of the `arrow` module, allowing us to use `go1.18` in this new code without forcing anyone who *isn't* using the compute module to upgrade. That way I can leverage the generics when writing the new compute code where appropriate.

Authored-by: Matt Topol <[email protected]>
Signed-off-by: Matt Topol <[email protected]>

dev/release/post-11-bump-versions-test.rb

@@ -195,6 +195,20 @@ def test_version_post_tag
           ],
         ]}
         next
+      elsif path == "go/arrow/compute/go.mod"
+        expected_changes << {
+          path: path,
+          hunks: [
+          [
+            "-module github.com/apache/arrow/go/v#{@snapshot_major_version}/arrow/compute",
+            "+module github.com/apache/arrow/go/v#{@next_major_version}/arrow/compute",
+            "-replace github.com/apache/arrow/go/v#{@snapshot_major_version} => ../../",
+            "+replace github.com/apache/arrow/go/v#{@next_major_version} => ../../",
+            "-\tgithub.com/apache/arrow/go/v#{@snapshot_major_version} v#{@snapshot_major_version}.0.0-00010101000000-000000000000",
+            "+\tgithub.com/apache/arrow/go/v#{@next_major_version} v#{@next_major_version}.0.0-00010101000000-000000000000",
+          ],
+        ]}
+        next
       end
       import_path = "github.com/apache/arrow/go/v#{@snapshot_major_version}"
       lines = File.readlines(path, chomp: true)

dev/release/rat_exclude_files.txt

@@ -141,6 +141,7 @@ go/arrow/internal/cpu/*
 go/arrow/type_string.go
 go/arrow/cdata/test/go.sum
 go/arrow/unionmode_string.go
+go/arrow/compute/go.sum
 go/arrow/compute/datumkind_string.go
 go/arrow/compute/valueshape_string.go
 go/*.tmpldata

dev/release/utils-prepare.sh

@@ -159,6 +159,14 @@ update_versions() {
   sed -i.bak -E -e \
     "s/const PkgVersion = \".*/const PkgVersion = \"${version}\"/" \
     arrow/doc.go  
+  # handle the pseudo version in the compute sub-module for now
+  # subsequent changes will allow this to remove the pseudo version but
+  # for now we have to overcome the slight conflict between the existing
+  # "compute" package and the new go.mod file.
+  sed -i.bak -E -e \
+    "s|v[0-9]+\\.0\\.0-00010101000000-000000000000|v${major_version}.0.0-00010101000000-000000000000|" \
+    arrow/compute/go.mod
+
   find . -name "*.bak" -exec rm {} \;
   git add .
   popd

go/arrow/compute/go.mod

@@ -0,0 +1,48 @@
+// 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.
+
+module github.com/apache/arrow/go/v10/arrow/compute
+
+go 1.18
+
+replace github.com/apache/arrow/go/v10 => ../../
+
+require (
+	github.com/apache/arrow/go/v10 v10.0.0-00010101000000-000000000000
+	github.com/stretchr/testify v1.8.0
+	golang.org/x/xerrors v0.0.0-20220609144429-65e65417b02f
+)
+
+require (
+	github.com/andybalholm/brotli v1.0.4 // indirect
+	github.com/apache/thrift v0.16.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/goccy/go-json v0.9.10 // indirect
+	github.com/golang/snappy v0.0.4 // indirect
+	github.com/google/flatbuffers v2.0.6+incompatible // indirect
+	github.com/klauspost/asmfmt v1.3.2 // indirect
+	github.com/klauspost/compress v1.15.9 // indirect
+	github.com/klauspost/cpuid/v2 v2.0.9 // indirect
+	github.com/minio/asm2plan9s v0.0.0-20200509001527-cdd76441f9d8 // indirect
+	github.com/minio/c2goasm v0.0.0-20190812172519-36a3d3bbc4f3 // indirect
+	github.com/pierrec/lz4/v4 v4.1.15 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/zeebo/xxh3 v1.0.2 // indirect
+	golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 // indirect
+	golang.org/x/sys v0.0.0-20220804214406-8e32c043e418 // indirect
+	golang.org/x/tools v0.1.12 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)