Move hash collision test to run only when merging to main. (#13973)

Author: Omega359

.github/workflows/hash_collisions.yml

@@ -0,0 +1,54 @@
+# 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.
+
+name: Rust Hash Collisions
+
+concurrency:
+  group: ${{ github.repository }}-${{ github.head_ref || github.sha }}-${{ github.workflow }}
+  cancel-in-progress: true
+
+# https://docs.github.com/en/actions/writing-workflows/choosing-when-your-workflow-runs/events-that-trigger-workflows#running-your-pull_request-workflow-when-a-pull-request-merges
+#
+# this job is intended to only run on merge to main branch
+on:
+  pull_request:
+    branches:
+      - main
+    types:
+      - closed
+
+jobs:
+  # Check answers are correct when hash values collide
+  hash-collisions:
+    name: cargo test hash collisions (amd64)
+    runs-on: ubuntu-latest
+    container:
+      image: amd64/rust
+    if: github.event.pull_request.merged == true
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+          fetch-depth: 1
+      - name: Setup Rust toolchain
+        uses: ./.github/actions/setup-builder
+        with:
+          rust-version: stable
+      - name: Run tests
+        run: |
+          cd datafusion
+          cargo test  --profile ci --exclude datafusion-examples --exclude datafusion-benchmarks --exclude datafusion-sqllogictest --workspace --lib --tests --features=force_hash_collisions,avro

.github/workflows/rust.yml

@@ -541,27 +541,6 @@ jobs:
       - name: Run clippy
         run: ci/scripts/rust_clippy.sh
 
-  # Check answers are correct when hash values collide
-  hash-collisions:
-    name: cargo test hash collisions (amd64)
-    needs: linux-build-lib
-    runs-on: ubuntu-latest
-    container:
-      image: amd64/rust
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          submodules: true
-          fetch-depth: 1
-      - name: Setup Rust toolchain
-        uses: ./.github/actions/setup-builder
-        with:
-          rust-version: stable
-      - name: Run tests
-        run: |
-          cd datafusion
-          cargo test  --profile ci --exclude datafusion-examples --exclude datafusion-benchmarks --exclude datafusion-sqllogictest --workspace --lib --tests --features=force_hash_collisions,avro
-
   cargo-toml-formatting-checks:
     name: check Cargo.toml formatting
     needs: linux-build-lib