Differentiable SQL: grad()/jvp()/vjp() over xarray and any DataFusion table

.github/workflows/publish.yml

@@ -91,6 +91,18 @@ jobs:
           manylinux: 2_28
           rustup-components: rust-std rustfmt
           sccache: 'true'
+          # protoc is required by the substrait crate build and must be
+          # installed inside the manylinux container.
+          before-script-linux: |
+            PROTOC_VERSION=29.3
+            case "$(uname -m)" in
+              x86_64) PROTOC_ARCH=x86_64 ;;
+              aarch64) PROTOC_ARCH=aarch_64 ;;
+              *) echo "unsupported arch $(uname -m)"; exit 1 ;;
+            esac
+            curl -L -o /tmp/protoc.zip "https://github.com/protocolbuffers/protobuf/releases/download/v${PROTOC_VERSION}/protoc-${PROTOC_VERSION}-linux-${PROTOC_ARCH}.zip"
+            unzip -o /tmp/protoc.zip -d /usr/local bin/protoc 'include/*'
+            protoc --version
           # abi3 (see Cargo.toml) produces one wheel for all CPython >= 3.10,
           # so a single interpreter is enough to build it.
           args: --release --strip --out dist -i python3.10
@@ -115,6 +127,18 @@ jobs:
           manylinux: 2_28
           rustup-components: rust-std rustfmt
           sccache: 'true'
+          # protoc is required by the substrait crate build and must be
+          # installed inside the manylinux container.
+          before-script-linux: |
+            PROTOC_VERSION=29.3
+            case "$(uname -m)" in
+              x86_64) PROTOC_ARCH=x86_64 ;;
+              aarch64) PROTOC_ARCH=aarch_64 ;;
+              *) echo "unsupported arch $(uname -m)"; exit 1 ;;
+            esac
+            curl -L -o /tmp/protoc.zip "https://github.com/protocolbuffers/protobuf/releases/download/v${PROTOC_VERSION}/protoc-${PROTOC_VERSION}-linux-${PROTOC_ARCH}.zip"
+            unzip -o /tmp/protoc.zip -d /usr/local bin/protoc 'include/*'
+            protoc --version
           # abi3 (see Cargo.toml) produces one wheel for all CPython >= 3.10,
           # so a single interpreter is enough to build it.
           args: --release --strip --out dist -i python3.10

Cargo.toml

@@ -23,6 +23,7 @@ async-stream = "0.3"
 async-trait = "0.1"
 datafusion = { version = "54.0.0" }
 datafusion-ffi = { version = "54.0.0" }
+sqlparser = { version = "0.59", features = ["visitor"] }
 futures = { version = "0.3" }
 # `abi3-py310` builds against CPython's stable ABI, so a single wheel per
 # platform works on all CPython >= 3.10 (matching `requires-python`). This