diff --git a/.github/workflows/build-sqlglotc.yml b/.github/workflows/build-sqlglotc.yml
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+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+#
+# sqlglotc is the mypyc-compiled companion extension for sqlglot: cibuildwheel
+# builds the `sqlglotc/` subdirectory of the tobymao/sqlglot monorepo, whose
+# setup.py mypyc-compiles a subset of sqlglot's own modules and ships the
+# resulting .so files under the `sqlglot.*` namespace (Requires-Dist pins the
+# matching `sqlglot==<version>`, so importing `sqlglot` picks up the compiled
+# extensions transparently). Upstream publishes wheels for cp310-cp314 (no
+# cp314t - "mypyc doesn't have great support for free threaded builds", same
+# as build-black.yml) on every platform except riscv64; sqlglotc/pyproject.toml
+# carries no [tool.cibuildwheel] table, so CIBW_* here isn't overriding
+# anything upstream committed (mirroring .github/workflows/package-publish.yml's
+# build-wheels job instead). Testing runs upstream's own `make unitc` recipe
+# (SKIP_INTEGRATION=1 python -m unittest) against the installed compiled
+# wheel; duckdb and pandas (imported by tests/test_optimizer.py and
+# tests/test_executor.py) come from our registry since neither ships riscv64
+# wheels on public PyPI.
+name: Build sqlglotc wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'sqlglotc version to build (git tag, e.g. 30.17.0)'
+        required: true
+        default: '30.17.0'
+  pull_request:
+    paths:
+      - '.github/workflows/build-sqlglotc.yml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ inputs.version || '30.17.0' }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+env:
+  SQLGLOTC_VERSION: ${{ inputs.version || '30.17.0' }}
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+
+  build_wheels:
+    needs: [setup]
+    name: Build sqlglotc ${{ inputs.version || '30.17.0' }} ${{ matrix.python }}-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 180
+    strategy:
+      fail-fast: false
+      matrix:
+        # mypyc emits per-interpreter (non-abi3) wheels; upstream skips free-threaded, so no cp314t.
+        python: ["cp312", "cp313", "cp314"]
+
+    steps:
+      # Full monorepo checkout: sqlglotc/setup.py compiles from the sibling
+      # ../sqlglot source tree, and tests/ (used below) lives at the repo root.
+      - name: Checkout sqlglot ${{ env.SQLGLOTC_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: tobymao/sqlglot
+          ref: v${{ env.SQLGLOTC_VERSION }}
+          fetch-depth: 0
+          persist-credentials: false
+
+      - name: Build wheels
+        uses: pypa/cibuildwheel@1828c10ab37f080699c7b81cea34097c684a7074  # v4.2.0
+        with:
+          package-dir: sqlglotc
+          only: ${{ matrix.python }}-manylinux_riscv64
+        env:
+          CIBW_MANYLINUX_RISCV64_IMAGE: ${{ env.MANYLINUX_RISCV64_IMAGE }}
+          CIBW_TEST_REQUIRES: duckdb pandas python-dateutil pytz
+          CIBW_ENVIRONMENT_PASS_LINUX: PIP_EXTRA_INDEX_URL PIP_ONLY_BINARY
+          PIP_EXTRA_INDEX_URL: https://pypi.riseproject.dev/simple/
+          # PyPI's newest pandas (3.0.5) ships no riscv64 wheel anywhere yet;
+          # without this, pip resolves it over our registry's 3.0.3 (which
+          # does have one) and falls back to a from-source build that never
+          # finishes in CI's time budget.
+          PIP_ONLY_BINARY: pandas
+          CIBW_TEST_COMMAND: cd {project} && SKIP_INTEGRATION=1 python -m unittest
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: sqlglotc-${{ env.SQLGLOTC_VERSION }}-${{ matrix.python }}-manylinux_riscv64
+          path: wheelhouse/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish sqlglotc ${{ inputs.version || '30.17.0' }}
+    needs: [setup, build_wheels]
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    with:
+      artifact-pattern: sqlglotc-${{ inputs.version || '30.17.0' }}-*-manylinux_riscv64