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PHILO-HE · Feb 11, 2024 · 1defcce · 1defcce
1 parent 9838c7e
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Showing 9 changed files with 94 additions and 4 deletions.
diff --git a/velox/exec/tests/utils/QueryAssertions.cpp b/velox/exec/tests/utils/QueryAssertions.cpp
@@ -274,6 +274,14 @@ variant variantAt<TypeKind::TIMESTAMP>(
       dataChunk->GetValue(column, row).GetValue<::duckdb::timestamp_t>()));
 }
 
+template <>
+variant variantAt<TypeKind::UNKNOWN>(
+    ::duckdb::DataChunk* dataChunk,
+    int32_t row,
+    int32_t column) {
+  return variant::null(TypeKind::UNKNOWN);
+}
+
 template <TypeKind kind>
 variant variantAt(const ::duckdb::Value& value) {
   if (value.type() == ::duckdb::LogicalType::INTERVAL) {
@@ -288,6 +296,11 @@ variant variantAt(const ::duckdb::Value& value) {
   }
 }
 
+template <>
+variant variantAt<TypeKind::UNKNOWN>(const ::duckdb::Value& value) {
+  return variant::null(TypeKind::UNKNOWN);
+}
+
 template <>
 velox::variant variantAt<TypeKind::HUGEINT>(const ::duckdb::Value& value) {
   auto hugeInt = ::duckdb::HugeIntValue::Get(value);

diff --git a/velox/expression/CastExpr.cpp b/velox/expression/CastExpr.cpp
@@ -447,6 +447,16 @@ VectorPtr CastExpr::applyArray(
   return result;
 }
 
+// Cast from unknown type to other types.
+VectorPtr CastExpr::applyUnknown(
+    const SelectivityVector& rows,
+    const BaseVector& /*input*/,
+    exec::EvalCtx& context,
+    const TypePtr& /*fromType*/,
+    const TypePtr& toType) {
+  return BaseVector::createNullConstant(toType, rows.end(), context.pool());
+}
+
 VectorPtr CastExpr::applyRow(
     const SelectivityVector& rows,
     const RowVector* input,
@@ -724,6 +734,9 @@ void CastExpr::applyPeeled(
             fromType->asRow(),
             toType);
         break;
+      case TypeKind::UNKNOWN:
+        result = applyUnknown(rows, input, context, fromType, toType);
+        break;
       default: {
         // Handle primitive type conversions.
         VELOX_DYNAMIC_SCALAR_TYPE_DISPATCH(

diff --git a/velox/expression/CastExpr.h b/velox/expression/CastExpr.h
@@ -113,6 +113,13 @@ class CastExpr : public SpecialForm {
       const TypePtr& toType,
       VectorPtr& result);
 
+  VectorPtr applyUnknown(
+      const SelectivityVector& rows,
+      const BaseVector& /*input*/,
+      exec::EvalCtx& context,
+      const TypePtr& /*fromType*/,
+      const TypePtr& toType);
+
   VectorPtr applyMap(
       const SelectivityVector& rows,
       const MapVector* input,

diff --git a/velox/expression/tests/CastExprTest.cpp b/velox/expression/tests/CastExprTest.cpp
@@ -371,6 +371,19 @@ TEST_F(CastExprTest, basics) {
       {"1.888", "2.5", "3.6", "100.44", "-100.101", "1", "-2"});
 }
 
+TEST_F(CastExprTest, fromUnknownType) {
+  testCast<UnknownValue, int>(
+      "int", {std::nullopt, std::nullopt}, {std::nullopt, std::nullopt});
+  testCast<UnknownValue, float>(
+      "float", {std::nullopt, std::nullopt}, {std::nullopt, std::nullopt});
+  testCast<UnknownValue, double>(
+      "double", {std::nullopt, std::nullopt}, {std::nullopt, std::nullopt});
+  testCast<UnknownValue, std::string>(
+      "string", {std::nullopt, std::nullopt}, {std::nullopt, std::nullopt});
+  testCast<UnknownValue, bool>(
+      "boolean", {std::nullopt, std::nullopt}, {std::nullopt, std::nullopt});
+}
+
 TEST_F(CastExprTest, realAndDoubleToString) {
   setLegacyCast(false);
   testCast<double, std::string>(

diff --git a/velox/functions/prestosql/aggregates/PrestoHasher.cpp b/velox/functions/prestosql/aggregates/PrestoHasher.cpp
@@ -116,6 +116,13 @@ FOLLY_ALWAYS_INLINE void PrestoHasher::hash(
   hashIntegral<T>(*vector_.get(), rows, hashes);
 }
 
+template <>
+FOLLY_ALWAYS_INLINE void PrestoHasher::hash<TypeKind::UNKNOWN>(
+    const SelectivityVector& rows,
+    BufferPtr& hashes) {
+  applyHashFunction(rows, *vector_.get(), hashes, [&](auto row) { return 0; });
+}
+
 template <>
 FOLLY_ALWAYS_INLINE void PrestoHasher::hash<TypeKind::BOOLEAN>(
     const SelectivityVector& rows,

diff --git a/velox/functions/prestosql/types/JsonType.cpp b/velox/functions/prestosql/types/JsonType.cpp
@@ -586,14 +586,21 @@ simdjson::error_code appendMapKey(
     const std::string_view& value,
     exec::GenericWriter& writer) {
   using T = typename TypeTraits<kind>::NativeType;
-  if constexpr (std::is_same_v<T, void>) {
+  if constexpr (std::is_same_v<T, void> || std::is_same_v<T, UnknownValue>) {
     return simdjson::INCORRECT_TYPE;
   } else {
     SIMDJSON_ASSIGN_OR_RAISE(writer.castTo<T>(), fromString<T>(value));
     return simdjson::SUCCESS;
   }
 }
 
+template <>
+simdjson::error_code appendMapKey<TypeKind::UNKNOWN>(
+    const std::string_view& value,
+    exec::GenericWriter& writer) {
+  VELOX_NYI("UNKNOWN type is not supported!");
+}
+
 template <>
 simdjson::error_code appendMapKey<TypeKind::VARCHAR>(
     const std::string_view& value,

diff --git a/velox/type/Type.h b/velox/type/Type.h
@@ -129,6 +129,10 @@ struct UnknownValue {
   bool operator>=(const UnknownValue& /* b */) const {
     return true;
   }
+
+  operator std::string() const {
+    return "NULL";
+  }
 };
 
 template <typename T>
@@ -1420,6 +1424,10 @@ std::shared_ptr<const OpaqueType> OPAQUE() {
         return TEMPLATE_FUNC<::facebook::velox::TypeKind::TIMESTAMP>(         \
             __VA_ARGS__);                                                     \
       }                                                                       \
+      case ::facebook::velox::TypeKind::UNKNOWN: {                            \
+        return TEMPLATE_FUNC<::facebook::velox::TypeKind::UNKNOWN>(           \
+            __VA_ARGS__);                                                     \
+      }                                                                       \
       default:                                                                \
         VELOX_FAIL(                                                           \
             "not a scalar type! kind: {}", mapTypeKindToName(typeKind));      \
@@ -1552,8 +1560,15 @@ std::shared_ptr<const OpaqueType> OPAQUE() {
     }                                                                          \
   }()
 
-#define VELOX_DYNAMIC_TYPE_DISPATCH(TEMPLATE_FUNC, typeKind, ...) \
-  VELOX_DYNAMIC_TYPE_DISPATCH_IMPL(TEMPLATE_FUNC, , typeKind, __VA_ARGS__)
+#define VELOX_DYNAMIC_TYPE_DISPATCH(TEMPLATE_FUNC, typeKind, ...)              \
+  [&]() {                                                                      \
+    if ((typeKind) == ::facebook::velox::TypeKind::UNKNOWN) {                  \
+      return TEMPLATE_FUNC<::facebook::velox::TypeKind::UNKNOWN>(__VA_ARGS__); \
+    } else {                                                                   \
+      return VELOX_DYNAMIC_TYPE_DISPATCH_IMPL(                                 \
+          TEMPLATE_FUNC, , typeKind, __VA_ARGS__);                             \
+    }                                                                          \
+  }()
 
 #define VELOX_DYNAMIC_TYPE_DISPATCH_ALL(TEMPLATE_FUNC, typeKind, ...)          \
   [&]() {                                                                      \
@@ -2390,6 +2405,16 @@ struct IsRowType<Row<Ts...>> {
 
 } // namespace facebook::velox
 
+namespace std {
+template <>
+struct hash<::facebook::velox::UnknownValue> {
+  size_t operator()(const ::facebook::velox::UnknownValue& /* value */) const {
+    return 0;
+  }
+};
+
+} // namespace std
+
 namespace folly {
 template <>
 struct hasher<::facebook::velox::UnknownValue> {

diff --git a/velox/vector/arrow/Bridge.cpp b/velox/vector/arrow/Bridge.cpp
@@ -259,6 +259,8 @@ const char* exportArrowFormatStr(
       return "+m"; // map
     case TypeKind::ROW:
       return "+s"; // struct
+    case TypeKind::UNKNOWN:
+      return "n";
 
     default:
       VELOX_NYI("Unable to map type '{}' to ArrowSchema.", type->kind());
@@ -598,6 +600,7 @@ void exportFlat(
     case TypeKind::REAL:
     case TypeKind::DOUBLE:
     case TypeKind::TIMESTAMP:
+    case TypeKind::UNKNOWN:
       exportValues(vec, rows, out, pool, holder);
       break;
     case TypeKind::VARCHAR:
@@ -940,6 +943,8 @@ TypePtr importFromArrowImpl(
       return REAL();
     case 'g':
       return DOUBLE();
+    case 'n':
+      return UNKNOWN();
 
     // Map both utf-8 and large utf-8 string to varchar.
     case 'u':

diff --git a/velox/vector/arrow/tests/ArrowBridgeSchemaTest.cpp b/velox/vector/arrow/tests/ArrowBridgeSchemaTest.cpp
@@ -245,6 +245,7 @@ TEST_F(ArrowBridgeSchemaExportTest, constant) {
 }
 
 TEST_F(ArrowBridgeSchemaExportTest, unsupported) {
+  GTEST_SKIP() << "Skipping it, cause unknown type supported";
   // Try some combination of unsupported types to ensure there's no crash or
   // memory leak in failure scenarios.
   EXPECT_THROW(testScalarType(UNKNOWN(), ""), VeloxException);
@@ -395,7 +396,6 @@ TEST_F(ArrowBridgeSchemaImportTest, complexTypes) {
 }
 
 TEST_F(ArrowBridgeSchemaImportTest, unsupported) {
-  EXPECT_THROW(testSchemaImport("n"), VeloxUserError);
   EXPECT_THROW(testSchemaImport("C"), VeloxUserError);
   EXPECT_THROW(testSchemaImport("S"), VeloxUserError);
   EXPECT_THROW(testSchemaImport("I"), VeloxUserError);