robin-sparkless 4.0.0

# CI for the workspace: robin-sparkless (root), robin-sparkless-core, robin-sparkless-polars, spark-sql-parser.
# All jobs use --workspace so every crate is built, formatted, and tested.
name: CI

on:
  push:
    branches: [main, master]
  pull_request:
    branches: [main, master]

jobs:
  format:
    name: Format
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust
        uses: dtolnay/rust-toolchain@master
        with:
          toolchain: 1.93.1
          components: rustfmt
      - name: Cache cargo
        uses: actions/cache@v4
        with:
          path: |
            ~/.cargo/registry
            ~/.cargo/git
            target
          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock', '**/Cargo.toml', 'rust-toolchain.toml') }}
          restore-keys: |
            ${{ runner.os }}-cargo-
      - name: Check format
        run: cargo fmt --check

  clippy:
    name: Clippy
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust
        uses: dtolnay/rust-toolchain@master
        with:
          toolchain: 1.93.1
          components: clippy
      - name: Cache cargo
        uses: actions/cache@v4
        with:
          path: |
            ~/.cargo/registry
            ~/.cargo/git
            target
          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock', '**/Cargo.toml', 'rust-toolchain.toml') }}
          restore-keys: |
            ${{ runner.os }}-cargo-
      - name: Clippy
        run: cargo clippy --workspace --all-features --all-targets -- -D warnings

  audit:
    name: Audit
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust
        uses: dtolnay/rust-toolchain@master
        with:
          toolchain: 1.93.1
      - name: Install cargo-audit
        run: cargo install cargo-audit
      - name: Cache cargo
        uses: actions/cache@v4
        with:
          path: |
            ~/.cargo/registry
            ~/.cargo/git
            target
          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock', '**/Cargo.toml', 'rust-toolchain.toml') }}
          restore-keys: |
            ${{ runner.os }}-cargo-
      - name: Audit
        run: cargo audit

  deny:
    name: Deny
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust
        uses: dtolnay/rust-toolchain@master
        with:
          toolchain: 1.93.1
      - name: Install cargo-deny
        run: cargo install cargo-deny
      - name: Cache cargo
        uses: actions/cache@v4
        with:
          path: |
            ~/.cargo/registry
            ~/.cargo/git
            target
          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock', '**/Cargo.toml', 'rust-toolchain.toml') }}
          restore-keys: |
            ${{ runner.os }}-cargo-
      - name: Deny
        run: cargo deny check advisories bans sources

  build:
    name: Build test binaries
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Install Rust
        uses: dtolnay/rust-toolchain@master
        with:
          toolchain: 1.93.1

      - name: Cache cargo
        uses: actions/cache@v4
        with:
          path: |
            ~/.cargo/registry
            ~/.cargo/git
            target
          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock', '**/Cargo.toml', 'rust-toolchain.toml') }}
          restore-keys: |
            ${{ runner.os }}-cargo-

      - name: Build test binaries
        run: cargo build --workspace --all-features --tests
        env:
          CARGO_BUILD_JOBS: 1

  test:
    name: Rust tests
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Rust
        uses: dtolnay/rust-toolchain@master
        with:
          toolchain: 1.93.1
      - name: Cache cargo
        uses: actions/cache@v4
        with:
          path: |
            ~/.cargo/registry
            ~/.cargo/git
            target
          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock', '**/Cargo.toml', 'rust-toolchain.toml') }}
          restore-keys: |
            ${{ runner.os }}-cargo-
      - name: Run Rust tests
        run: cargo test --workspace --all-features

  python:
    name: Python (sparkless)
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Install Python
        uses: actions/setup-python@v5
        with:
          python-version: "3.11"
      - name: Install Rust
        uses: dtolnay/rust-toolchain@master
        with:
          toolchain: 1.93.1
      - name: Cache cargo
        uses: actions/cache@v4
        with:
          path: |
            ~/.cargo/registry
            ~/.cargo/git
            target
          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock', '**/Cargo.toml', 'rust-toolchain.toml') }}
          restore-keys: |
            ${{ runner.os }}-cargo-
      - name: Build and test sparkless
        run: |
          python -m venv .venv
          .venv/bin/pip install --upgrade pip maturin
          cd python && ../.venv/bin/maturin develop
          ../.venv/bin/python -c "from sparkless.sql import SparkSession; from sparkless.sql.functions import col, lit_i64; s = SparkSession.builder.app_name('ci').get_or_create(); df = s.create_dataframe([(1, 2, 'a')], ['x', 'y', 'z']); assert df.count() == 1; print('sparkless OK')"
      - name: Install pytest and run tests (fast subset)
        run: |
          .venv/bin/pip install pytest pytest-xdist hypothesis pytest-timeout
          .venv/bin/python -m pytest tests -m "not delta and not integration" -n 4 -v --tb=short
        timeout-minutes: 15
        # Job fails if pytest exits non-zero (no continue-on-error)