kou commented on code in PR #40514:
URL: https://github.com/apache/arrow/pull/40514#discussion_r1533273515


##########
dev/release/verify-release-candidate.sh:
##########
@@ -499,6 +499,36 @@ maybe_setup_conda() {
   fi
 }
 
+install_maven() {
+  MAVEN_VERSION=3.8.7
+  SYSTEM_MAVEN_VERSION=$(mvn -v | head -n 1 | awk '{print $3}')
+
+  if [[ "$MAVEN_VERSION" == "$SYSTEM_MAVEN_VERSION" ]]; then
+      echo "Skip Install - versions are the same"
+  else
+      # the following logic only verifies released versions
+      older_version=$(printf '%s\n%s\n' "$SYSTEM_MAVEN_VERSION" 
"$MAVEN_VERSION" | sort --version-sort | head -n1)
+      if [[ "$older_version" == "$SYSTEM_MAVEN_VERSION" && 
"$SYSTEM_MAVEN_VERSION" != "$MAVEN_VERSION" ]]; then

Review Comment:
   Could you remove redundant condition?
   
   ```suggestion
         if [[ "$older_version" == "$SYSTEM_MAVEN_VERSION" ]]; then
   ```



##########
dev/release/verify-release-candidate.sh:
##########
@@ -1202,6 +1233,7 @@ test_wheels() {
 
 test_jars() {
   show_header "Testing Java JNI jars"
+  maybe_setup_maven

Review Comment:
   Could you add an empty line between `show_header` and `maybe_setup_*` like 
others?
   
   ```suggestion
   
     maybe_setup_maven
   ```



##########
dev/release/verify-release-candidate.sh:
##########
@@ -499,6 +499,36 @@ maybe_setup_conda() {
   fi
 }
 
+install_maven() {
+  MAVEN_VERSION=3.8.7
+  SYSTEM_MAVEN_VERSION=$(mvn -v | head -n 1 | awk '{print $3}')
+
+  if [[ "$MAVEN_VERSION" == "$SYSTEM_MAVEN_VERSION" ]]; then
+      echo "Skip Install - versions are the same"
+  else
+      # the following logic only verifies released versions
+      older_version=$(printf '%s\n%s\n' "$SYSTEM_MAVEN_VERSION" 
"$MAVEN_VERSION" | sort --version-sort | head -n1)
+      if [[ "$older_version" == "$SYSTEM_MAVEN_VERSION" && 
"$SYSTEM_MAVEN_VERSION" != "$MAVEN_VERSION" ]]; then
+          show_info "Installing Maven version ${MAVEN_VERSION}..."
+          
APACHE_MIRROR="https://www.apache.org/dyn/closer.lua?action=download&filename=";
+          curl -sL -o apache-maven-${MAVEN_VERSION}-bin.tar.gz \
+            
${APACHE_MIRROR}/maven/maven-3/${MAVEN_VERSION}/binaries/apache-maven-${MAVEN_VERSION}-bin.tar.gz
+          tar xzf apache-maven-${MAVEN_VERSION}-bin.tar.gz
+          export PATH=$(pwd)/apache-maven-${MAVEN_VERSION}/bin:$PATH
+          show_info "Installed Maven version $(mvn -v)"

Review Comment:
   ```suggestion
             show_info "Installed Maven version $(mvn -v | head -n 1 | awk 
'{print $3}')"
   ```



##########
dev/release/verify-release-candidate.sh:
##########
@@ -499,6 +499,36 @@ maybe_setup_conda() {
   fi
 }
 
+install_maven() {
+  MAVEN_VERSION=3.8.7
+  SYSTEM_MAVEN_VERSION=$(mvn -v | head -n 1 | awk '{print $3}')
+
+  if [[ "$MAVEN_VERSION" == "$SYSTEM_MAVEN_VERSION" ]]; then
+      echo "Skip Install - versions are the same"
+  else
+      # the following logic only verifies released versions
+      older_version=$(printf '%s\n%s\n' "$SYSTEM_MAVEN_VERSION" 
"$MAVEN_VERSION" | sort --version-sort | head -n1)
+      if [[ "$older_version" == "$SYSTEM_MAVEN_VERSION" && 
"$SYSTEM_MAVEN_VERSION" != "$MAVEN_VERSION" ]]; then
+          show_info "Installing Maven version ${MAVEN_VERSION}..."
+          
APACHE_MIRROR="https://www.apache.org/dyn/closer.lua?action=download&filename=";
+          curl -sL -o apache-maven-${MAVEN_VERSION}-bin.tar.gz \
+            
${APACHE_MIRROR}/maven/maven-3/${MAVEN_VERSION}/binaries/apache-maven-${MAVEN_VERSION}-bin.tar.gz
+          tar xzf apache-maven-${MAVEN_VERSION}-bin.tar.gz
+          export PATH=$(pwd)/apache-maven-${MAVEN_VERSION}/bin:$PATH
+          show_info "Installed Maven version $(mvn -v)"
+      else
+          show_info "System Maven version ${SYSTEM_MAVEN_VERSION} is equal or 
newer than asked Maven version ${MAVEN_VERSION}. Skipping installation."
+      fi

Review Comment:
   Could you use 2-space indent?



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