feat(fuzz): row-encoding fuzz target for vortex-row

.github/workflows/fuzz.yml

@@ -177,6 +177,42 @@ jobs:
       gh_token: ${{ secrets.GITHUB_TOKEN }}
       incident_io_alert_token: ${{ secrets.INCIDENT_IO_ALERT_TOKEN }}
 
+  # ============================================================================
+  # Row Encoding Fuzzer
+  # ============================================================================
+  row_encode_fuzz:
+    name: "Row Encoding Fuzz"
+    uses: ./.github/workflows/run-fuzzer.yml
+    with:
+      fuzz_target: row_encode
+      jobs: 4
+    secrets:
+      R2_FUZZ_ACCESS_KEY_ID: ${{ secrets.R2_FUZZ_ACCESS_KEY_ID }}
+      R2_FUZZ_SECRET_ACCESS_KEY: ${{ secrets.R2_FUZZ_SECRET_ACCESS_KEY }}
+
+  report-row-encode-fuzz-failures:
+    name: "Report Row Encoding Fuzz Failures"
+    needs: row_encode_fuzz
+    if: always() && needs.row_encode_fuzz.outputs.crashes_found == 'true'
+    permissions:
+      issues: write
+      contents: read
+      id-token: write
+      pull-requests: read
+    uses: ./.github/workflows/report-fuzz-crash.yml
+    with:
+      fuzz_target: row_encode
+      crash_file: ${{ needs.row_encode_fuzz.outputs.first_crash_name }}
+      artifact_url: ${{ needs.row_encode_fuzz.outputs.artifact_url }}
+      artifact_name: row_encode-crash-artifacts
+      logs_artifact_name: row_encode-logs
+      branch: ${{ github.ref_name }}
+      commit: ${{ github.sha }}
+    secrets:
+      claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
+      gh_token: ${{ secrets.GITHUB_TOKEN }}
+      incident_io_alert_token: ${{ secrets.INCIDENT_IO_ALERT_TOKEN }}
+
   # ============================================================================
   # Compress Roundtrip Fuzzer
   # ============================================================================

fuzz/Cargo.toml

@@ -39,6 +39,7 @@ vortex-error = { workspace = true }
 vortex-fsst = { workspace = true, features = ["_test-harness"] }
 vortex-io = { workspace = true }
 vortex-mask = { workspace = true }
+vortex-row = { workspace = true }
 vortex-runend = { workspace = true, features = ["arbitrary"] }
 vortex-session = { workspace = true }
 vortex-utils = { workspace = true }
@@ -104,3 +105,11 @@ name = "compress_gpu"
 path = "fuzz_targets/compress_gpu.rs"
 test = false
 required-features = ["native", "cuda"]
+
+[[bin]]
+bench = false
+doc = false
+name = "row_encode"
+path = "fuzz_targets/row_encode.rs"
+test = false
+required-features = ["native"]

fuzz/fuzz_targets/row_encode.rs

@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: Copyright the Vortex contributors
+
+#![no_main]
+#![expect(clippy::unwrap_used)]
+
+use std::str::FromStr;
+
+use libfuzzer_sys::Corpus;
+use libfuzzer_sys::fuzz_target;
+use tracing::level_filters::LevelFilter;
+use vortex_error::vortex_panic;
+use vortex_fuzz::FuzzRowEncode;
+use vortex_fuzz::run_row_encode;
+
+fuzz_target!(
+    init: {
+        let fmt = tracing_subscriber::fmt::format()
+            .with_ansi(false) // Colour output is messed up in raw logs
+            .without_time() // We run fuzzer in CI which prepends timestamps
+            .compact();
+        let level = std::env::var("RUST_LOG").map(
+            |v| LevelFilter::from_str(v.as_str()).unwrap()).unwrap_or(LevelFilter::INFO);
+        tracing_subscriber::fmt()
+            .event_format(fmt)
+            .with_max_level(level)
+            .init();
+    },
+    |input: FuzzRowEncode| -> Corpus {
+    match run_row_encode(input) {
+        Ok(true) => Corpus::Keep,
+        Ok(false) => Corpus::Reject,
+        Err(e) => vortex_panic!("{e}"),
+    }
+});

fuzz/src/lib.rs

@@ -7,6 +7,7 @@ mod array;
 pub mod compress;
 pub mod error;
 pub mod fsst_like;
+mod row;
 
 // File module only available for native builds (requires vortex-file which uses tokio)
 #[cfg(not(target_arch = "wasm32"))]
@@ -31,6 +32,8 @@ pub use fsst_like::run_fsst_like_fuzz;
 pub use gpu::FuzzCompressGpu;
 #[cfg(feature = "cuda")]
 pub use gpu::run_compress_gpu;
+pub use row::FuzzRowEncode;
+pub use row::run_row_encode;
 
 pub const FUZZ_ARRAY_MAX_LEN: usize = 2048;
 pub const FUZZ_FILE_ARRAY_MAX_LEN: usize = 16_384;