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PHILO-HE · Feb 16, 2024 · ff45670 · ff45670
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diff --git a/velox/expression/CastExpr.cpp b/velox/expression/CastExpr.cpp
@@ -724,6 +724,10 @@ void CastExpr::applyPeeled(
             fromType->asRow(),
             toType);
         break;
+      case TypeKind::UNKNOWN:
+        result =
+            BaseVector::createNullConstant(toType, rows.end(), context.pool());
+        break;
       default: {
         // Handle primitive type conversions.
         VELOX_DYNAMIC_SCALAR_TYPE_DISPATCH(

diff --git a/velox/expression/tests/CastExprTest.cpp b/velox/expression/tests/CastExprTest.cpp
@@ -371,6 +371,33 @@ TEST_F(CastExprTest, basics) {
       {"1.888", "2.5", "3.6", "100.44", "-100.101", "1", "-2"});
 }
 
+TEST_F(CastExprTest, fromUnknownType) {
+  testCast<UnknownValue, int8_t>(
+      "tinyint", {std::nullopt, std::nullopt}, {std::nullopt, std::nullopt});
+  testCast<UnknownValue, int16_t>(
+      "smallint", {std::nullopt, std::nullopt}, {std::nullopt, std::nullopt});
+  testCast<UnknownValue, int32_t>(
+      "int", {std::nullopt, std::nullopt}, {std::nullopt, std::nullopt});
+  testCast<UnknownValue, int64_t>(
+      "bigint", {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});
+  testCast<UnknownValue, Timestamp>(
+      "timestamp", {std::nullopt, std::nullopt}, {std::nullopt, std::nullopt});
+  testCast<UnknownValue, int32_t>(
+      "date",
+      {std::nullopt, std::nullopt},
+      {std::nullopt, std::nullopt},
+      UNKNOWN(),
+      DATE());
+}
+
 TEST_F(CastExprTest, realAndDoubleToString) {
   setLegacyCast(false);
   testCast<double, std::string>(