Improve MSRV CI check to print out problems to log

.github/workflows/rust.yml

@@ -566,18 +566,26 @@ jobs:
       - name: Check datafusion
         working-directory: datafusion/core
         run: |
-          # If you encounter an error with any of the commands below
-          # it means some crate in your dependency tree has a higher 
-          # MSRV (Min Supported Rust Version) than the one specified 
-          # in the `rust-version` key of `Cargo.toml`. Check your 
-          # dependencies or update the version in `Cargo.toml`
-          cargo msrv verify
+          # If you encounter an error with any of the commands below it means
+          # your code or some crate in the dependency tree has a higher MSRV
+          # (Min Supported Rust Version) than the one specified in the
+          # `rust-version` key of `Cargo.toml`.
+          # 
+          # To resolve, either:
+          # 1. Change your code to use older Rust features, 
+          # 2. Revert dependency update
+          # 3. Update the MSRV version in `Cargo.toml`
+          #
+          # Please see the DataFusion Rust Version Compatibility Policy before
+          # updating Cargo.toml. You may have to update the code instead. 
+          # https://github.com/apache/datafusion/blob/main/README.md#rust-version-compatibility-policy
+          cargo msrv verify --log-target stdout
       - name: Check datafusion-substrait
         working-directory: datafusion/substrait
-        run: cargo msrv verify
+        run: cargo msrv verify --log-target stdout
       - name: Check datafusion-proto
         working-directory: datafusion/proto
-        run: cargo msrv verify
+        run: cargo msrv verify --log-target stdout
       - name: Check datafusion-cli
         working-directory: datafusion-cli
-        run: cargo msrv verify
+        run: cargo msrv verify --log-target stdout