diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 74f431ac3..bee23239a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -5,9 +5,11 @@ on:
     branches:
       - master
       - develop
+      - 0.2.x
     paths-ignore:
-      - "CHANGELOG"
       - "**.md"
+      - "docs/**"
+      - "**/CHANGELOG"
 
   pull_request:
     types:
@@ -15,17 +17,18 @@ on:
       - synchronize
       - reopened
     paths-ignore:
-      - "CHANGELOG"
       - "**.md"
+      - "docs/**"
+      - "**/CHANGELOG"
 
 jobs:
   build:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: [8, 9, 11]
-        # most recent LTS releases and latest stable build
-        clickhouse: ["19.14", "20.3", "20.8", "latest"]
+        java: [8, 11]
+        # most recent LTS releases as well as latest stable builds
+        clickhouse: ["19.14", "20.3", "20.8", "20.10", "20.12", "21.2", "latest"]
     name: Build using JDK ${{ matrix.java }} against ClickHouse ${{ matrix.clickhouse }}
     steps:
       - name: Check out Git repository
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index d13b22284..1f158a1ad 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -6,7 +6,7 @@ on:
       version:
         description: "Release version"
         required: true
-        default: "0.2.6-SNAPSHOT"
+        default: "0.3.0-SNAPSHOT"
 
 jobs:
   release:
@@ -19,13 +19,14 @@ jobs:
       - name: Install Java and Maven
         uses: actions/setup-java@v1
         with:
-          java-version: 1.8
-      - run: sed -i -e 's|^\(    <version>\).*\(</version>\)$|\1${{ github.event.inputs.version }}\2|' pom.xml
+          java-version: 8
+      - run: find . -type f -name "pom.xml" -exec sed -i -e 's|${revision}|${{ github.event.inputs.version }}|g' -e 's|${parent.groupId}|tech.clickhouse|g' '{}' \;
+      - run: find . -type f -name "log4j.properties" -exec sed -i -e 's|DEBUG|WARN|g' '{}' \;
       - name: Release Maven package
         uses: samuelmeuli/action-maven-publish@v1
         with:
           maven_profiles: release
-          maven_args: --batch-mode
+          maven_args: -q --batch-mode
           gpg_private_key: ${{ secrets.GPG_PRIVATE_KEY }}
           gpg_passphrase: ${{ secrets.GPG_PASSPHRASE }}
           nexus_username: ${{ secrets.SONATYPE_USER }}
diff --git a/.github/workflows/verify.yml b/.github/workflows/verify.yml
index 229a4aeee..f509ff779 100644
--- a/.github/workflows/verify.yml
+++ b/.github/workflows/verify.yml
@@ -14,23 +14,126 @@ on:
       pr:
         description: "Pull request#"
         required: false
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+    paths-ignore:
+      - "**.md"
+      - "docs/**"
+      - "**/CHANGELOG"
+  issue_comment:
+    types:
+      - created
+      - edited
 
 jobs:
-  verify:
+  verify-commented-pr:
     runs-on: ubuntu-latest
-    name: Verify branch/PR using JDK ${{ github.event.inputs.java }} against ClickHouse ${{ github.event.inputs.clickhouse }}
+    name: Verify commented PR
+    if: github.event_name == 'issue_comment' && github.event.issue.pull_request
     steps:
+      - uses: zhicwu/pull-request-comment-trigger@master
+        id: check
+        with:
+          trigger: '@verify'
+          reaction: rocket
+        env:
+          GITHUB_TOKEN: '${{ secrets.GITHUB_TOKEN }}'
+      - name: Extra parameters from PR comment
+        if: steps.check.outputs.triggered == 'true'
+        uses: actions/github-script@v3
+        id: commented
+        env:
+          COMMENT_BODY: '${{ github.event.comment.body }}'
+        with:
+          script: |
+            const keyword = '@verify';
+            let buildArgs = process.env.COMMENT_BODY;
+            core.info(`Got commented body: ${buildArgs}`);
+            buildArgs = buildArgs.substring(buildArgs.lastIndexOf(keyword) + keyword.length);
+            const args = buildArgs.match(/[^\s]+/g); 
+            core.info(`Got commented arguments: ${args}`);
+
+            return {
+                pr: context.issue.number,
+                clickhouse: args && args.length > 0 ? args[0] : "latest",
+                java: args && args.length > 1 ? args[1] : "8"
+            };
       - name: Check out repository
         uses: actions/checkout@v2
-        if: github.event.inputs.pr == ''
-      - name: Check out PR ${{ github.event.inputs.pr }}
+      - name: Check out commented PR
+        if: steps.check.outputs.triggered == 'true'
+        run: |
+          git fetch --no-tags --prune --progress --no-recurse-submodules --depth=1 origin pull/${{ fromJSON(steps.commented.outputs.result).pr }}/merge:merged-pr && git checkout merged-pr
+      - name: Set up JDK
+        if: steps.check.outputs.triggered == 'true'
+        uses: actions/setup-java@v1
+        with:
+          java-version: ${{ fromJSON(steps.commented.outputs.result).java }}
+        continue-on-error: true
+      - name: Verify with Maven
+        if: steps.check.outputs.triggered == 'true'
+        run: mvn --batch-mode --update-snapshots -DclickhouseVersion=${{ fromJSON(steps.commented.outputs.result).clickhouse }} verify
+        id: maven
+        continue-on-error: true
+      - name: Comment PR
+        uses: actions/github-script@v3
+        if: steps.check.outputs.triggered == 'true'
+        env:
+          CLICKHOUSE_VRESION: ${{ fromJSON(steps.commented.outputs.result).clickhouse }}
+          JAVA_VERSION: ${{ fromJSON(steps.commented.outputs.result).java }}
+          PREV_STEP_RESULT: '${{ steps.maven.outcome }}'
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const { issue: { number: issue_number }, repo: { owner, repo }  } = context;
+            const result = process.env.PREV_STEP_RESULT;
+            const buildUrl = `https://github.com/${owner}/${repo}/actions/runs/${context.runId}`;
+            const flag = result === 'success'
+              ? ':green_circle:'
+              : (result === 'failure' ? ':red_circle:' : ':yellow_circle:');
+            const msg = `${flag} verify using JDK [${process.env.JAVA_VERSION}] and ClickHouse [${process.env.CLICKHOUSE_VRESION}]: [${result}](${buildUrl})`;
+            github.issues.createComment({ issue_number, owner, repo, body: msg });
+
+  verify-on-demand:
+    runs-on: ubuntu-latest
+    name: Verify on demand
+    if: github.event_name == 'workflow_dispatch'
+    steps:
+      - name: Check out repository
         uses: actions/checkout@v2
+      - name: Check out PR
+        run: |
+          git fetch --no-tags --prune --progress --no-recurse-submodules --depth=1 origin pull/${{ github.event.inputs.pr }}/merge:merged-pr && git checkout merged-pr
         if: github.event.inputs.pr != ''
-        with:
-          ref: refs/remotes/pull/${{ github.event.inputs.pr }}/merge
       - name: Set up JDK ${{ github.event.inputs.java }}
         uses: actions/setup-java@v1
         with:
           java-version: ${{ github.event.inputs.java }}
+        continue-on-error: true
       - name: Verify with Maven
         run: mvn --batch-mode --update-snapshots -DclickhouseVersion=${{ github.event.inputs.clickhouse }} verify
+        id: maven
+        continue-on-error: true
+      - name: 'Comment PR'
+        uses: actions/github-script@v3
+        if: github.event.inputs.pr != ''
+        env:
+          PR_NO: ${{ github.event.inputs.pr }}
+          CLICKHOUSE_VRESION: ${{ github.event.inputs.clickhouse }}
+          JAVA_VERSION: ${{ github.event.inputs.java }}
+          PREV_STEP_RESULT: '${{ steps.maven.outcome }}'
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const issue_number = process.env.PR_NO;
+            const { repo: { owner, repo }  } = context;
+            const result = process.env.PREV_STEP_RESULT;
+            const buildUrl = `https://github.com/${owner}/${repo}/actions/runs/${context.runId}`;
+            const flag = result === 'success'
+              ? ':green_circle:'
+              : (result === 'failure' ? ':red_circle:' : ':yellow_circle:');
+            const msg = `${flag} verify using JDK [${process.env.JAVA_VERSION}] and ClickHouse [${process.env.CLICKHOUSE_VRESION}]: [${result}](${buildUrl})`;
+            github.issues.createComment({ issue_number, owner, repo, body: msg });