Add Implicit Casting from List to Array

src/function/built_in_function_utils.cpp

@@ -149,6 +149,10 @@ uint32_t BuiltInFunctionsUtils::getCastCost(LogicalTypeID inputTypeID, LogicalTy
         // currently don't allow timestamp to other timestamp types
         // When we implement this in the future, revise tryGetMaxLogicalTypeID
         return castTimestamp(targetTypeID);
+    case LogicalTypeID::LIST:
+        return castList(targetTypeID);
+    case LogicalTypeID::ARRAY:
+        return castArray(targetTypeID);
     default:
         return UNDEFINED_CAST_COST;
     }
@@ -388,6 +392,24 @@ uint32_t BuiltInFunctionsUtils::castFromRDFVariant(LogicalTypeID inputTypeID) {
     }
 }
 
+uint32_t BuiltInFunctionsUtils::castList(LogicalTypeID targetTypeID) {
+    switch (targetTypeID) {
+    case LogicalTypeID::ARRAY:
+        return getTargetTypeCost(targetTypeID);
+    default:
+        return UNDEFINED_CAST_COST;
+    }
+}
+
+uint32_t BuiltInFunctionsUtils::castArray(LogicalTypeID targetTypeID) {
+    switch (targetTypeID) {
+    case LogicalTypeID::LIST:
+        return getTargetTypeCost(targetTypeID);
+    default:
+        return UNDEFINED_CAST_COST;
+    }
+}
+
 // When there is multiple candidates functions, e.g. double + int and double + double for input
 // "1.5 + parameter", we prefer the one without any implicit casting i.e. double + double.
 // Additionally, we prefer function with string parameter because string is most permissive and can

src/function/vector_cast_functions.cpp

@@ -138,6 +138,11 @@ static bool hasImplicitCastArrayToList(const LogicalType& srcType, const Logical
         *ListType::getChildType(&dstType));
 }
 
+static bool hasImplicitCastListToArray(const LogicalType& srcType, const LogicalType& dstType) {
+    return CastFunction::hasImplicitCast(*ListType::getChildType(&srcType),
+        *ArrayType::getChildType(&dstType));
+}
+
 static bool hasImplicitCastStruct(const LogicalType& srcType, const LogicalType& dstType) {
     auto srcFields = StructType::getFields(&srcType), dstFields = StructType::getFields(&dstType);
     if (srcFields.size() != dstFields.size()) {
@@ -178,6 +183,10 @@ bool CastFunction::hasImplicitCast(const LogicalType& srcType, const LogicalType
             dstType.getLogicalTypeID() == LogicalTypeID::LIST) {
             return hasImplicitCastArrayToList(srcType, dstType);
         }
+        if (srcType.getLogicalTypeID() == LogicalTypeID::LIST &&
+            dstType.getLogicalTypeID() == LogicalTypeID::ARRAY) {
+            return hasImplicitCastListToArray(srcType, dstType);
+        }
         if (srcType.getLogicalTypeID() != dstType.getLogicalTypeID()) {
             return false;
         }

src/include/function/built_in_function_utils.h

@@ -71,6 +71,10 @@ class BuiltInFunctionsUtils {
 
     static uint32_t castUUID(common::LogicalTypeID targetTypeID);
 
+    static uint32_t castList(common::LogicalTypeID targetTypeID);
+
+    static uint32_t castArray(common::LogicalTypeID targetTypeID);
+
     static Function* getBestMatch(std::vector<Function*>& functions);
 
     static uint32_t getFunctionCost(const std::vector<common::LogicalType>& inputTypes,

test/test_files/common/arrayimplicitcasting.test

@@ -9,3 +9,25 @@
 -STATEMENT CREATE (t:tab {a: cast([1, 2, 3], 'int64[3]')}) RETURN t.a
 ---- 1
 [1,2,3]
+
+-CASE ListArrayImplicitCast
+-STATEMENT CREATE NODE TABLE T0(a SERIAL, b INT64[], c DOUBLE[2], d STRING[], PRIMARY KEY(a));
+---- ok
+-STATEMENT CREATE (:T0 {b: [1.0, 2.0], c: [1, 2], d: [3, 5]});
+---- ok
+-STATEMENT MATCH (a:T0) RETURN a.a, a.b, a.c, a.d;
+---- 1
+0|[1,2]|[1.000000,2.000000]|[3,5]
+
+-CASE CastCostTest
+-SKIP
+-STATEMENT CREATE NODE TABLE Item(id UINT64, item STRING, price DOUBLE, vector DOUBLE[2], PRIMARY KEY (id))
+---- ok
+-STATEMENT MERGE (a:Item {id: 1, item: 'apple', price: 2.0, vector: [3.1, 4.1]})
+---- ok
+-STATEMENT MERGE (b:Item {id: 2, item: 'banana', price: 1.0, vector: [5.9, 26.5]})
+---- ok
+-STATEMENT MATCH (a:Item) RETURN a.item, a.price, array_cosine_similarity(a.vector, [6.0, 25.0]) AS sim ORDER BY sim DESC
+---- 2
+['banana',1.0,0.9998642653091405]
+['apple',2.0,0.9163829638139936]