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csharp/src/Apache.Arrow.Adbc/Extensions/IArrowArrayExtensions.cs

@@ -19,7 +19,6 @@
 using System.Collections;
 using System.Collections.Generic;
 using System.Data.SqlTypes;
-using System.Dynamic;
 using System.IO;
 using System.Text.Json;
 using Apache.Arrow.Types;
@@ -35,19 +34,39 @@ public enum StructResultType
     public static class IArrowArrayExtensions
     {
         /// <summary>
-        /// Helper extension to get a value from the <see cref="IArrowArray"/> at the specified index.
+        /// Overloaded. Helper extension to get a value from the <see cref="IArrowArray"/> at the specified index.
         /// </summary>
         /// <param name="arrowArray">
         /// The Arrow array.
         /// </param>
         /// <param name="index">
         /// The index in the array to get the value from.
         /// </param>
+        public static object? ValueAt(this IArrowArray arrowArray, int index)
+        {
+            return ValueAt(arrowArray, index, StructResultType.JsonString);
+        }
+
+        /// <summary>
+        /// Overloaded. Helper extension to get a value from the <see cref="IArrowArray"/> at the specified index.
+        /// </summary>
+        /// <param name="arrowArray">
+        /// The Arrow array.
+        /// </param>
+        /// <param name="index">
+        /// The index in the array to get the value from.
+        /// </param>
+        /// <param name="resultType">
+        /// T
+        /// </param>
         public static object? ValueAt(this IArrowArray arrowArray, int index, StructResultType resultType = StructResultType.JsonString)
         {
             if (arrowArray == null) throw new ArgumentNullException(nameof(arrowArray));
             if (index < 0) throw new ArgumentOutOfRangeException(nameof(index));
 
+            if (arrowArray.IsNull(index))
+                return null;
+
             switch (arrowArray.Data.DataType.TypeId)
             {
                 case ArrowTypeId.Null:
@@ -136,14 +155,7 @@ public static class IArrowArrayExtensions
                             throw new NotSupportedException($"Unsupported interval unit: {((IntervalType)arrowArray.Data.DataType).Unit}");
                     }
                 case ArrowTypeId.Binary:
-                    if (!arrowArray.IsNull(index))
-                    {
-                        return ((BinaryArray)arrowArray).GetBytes(index).ToArray();
-                    }
-                    else
-                    {
-                        return null;
-                    }
+                    return ((BinaryArray)arrowArray).GetBytes(index).ToArray();
                 case ArrowTypeId.List:
                     return ((ListArray)arrowArray).GetSlicedValues(index);
                 case ArrowTypeId.Struct:
@@ -161,15 +173,29 @@ public static class IArrowArrayExtensions
         }
 
         /// <summary>
-        /// Helper extension to get a value from the <see cref="IArrowArray"/> at the specified index.
+        /// Overloaded. Helper extension to get a value converter for the <see href="IArrowType"/>.
         /// </summary>
-        /// <param name="arrowArray">
-        /// The Arrow array.
+        /// <param name="arrayType">
+        /// The return type of an item in a StructArray.
         /// </param>
-        /// <param name="index">
-        /// The index in the array to get the value from.
+        public static Func<IArrowArray, int, object?> GetValueConverter(this IArrowType arrayType)
+        {
+            return GetValueConverter(arrayType, StructResultType.JsonString);
+        }
+
+        /// <summary>
+        /// Overloaded. Helper extension to get a value from the <see cref="IArrowArray"/> at the specified index.
+        /// </summary>
+        /// <param name="arrayType">
+        /// The Arrow array type.
+        /// </param>
+        /// <param name="sourceType">
+        /// The incoming <see cref="SourceStringType"/>.
         /// </param>
-        public static Func<IArrowArray, int, object?> GetValueConverter(this IArrowType arrayType, StructResultType resultType = StructResultType.JsonString)
+        /// <param name="resultType">
+        /// The return type of an item in a StructArray.
+        /// </param>
+        public static Func<IArrowArray, int, object?> GetValueConverter(this IArrowType arrayType, StructResultType resultType)
         {
             if (arrayType == null) throw new ArgumentNullException(nameof(arrayType));
 
@@ -208,23 +234,9 @@ public static class IArrowArrayExtensions
                 case ArrowTypeId.Int64:
                     return (array, index) => ((Int64Array)array).GetValue(index);
                 case ArrowTypeId.String:
-                    return (array, index) =>
-                    {
-                        StringArray? sArray = array as StringArray;
-
-                        if (sArray != null)
-                        {
-                            return sArray.GetString(index);
-                        }
-                        else
-                        {
-                            // some callers treat the Decimal256Array values as a string
-                            Decimal256Array? array256 = array as Decimal256Array;
-                            return array256?.GetString(index);
-                        }
-
-                        throw new AdbcException($"Cannot get the value at {index}. A String type was requested but neither a StringArray or Decimal256Array was found.", AdbcStatusCode.InvalidData);
-                    };
+                    return (array, index) => array.Data.DataType.TypeId == ArrowTypeId.Decimal256 ?
+                        ((Decimal256Array)array).GetString(index) :
+                        ((StringArray)array).GetString(index);
 #if NET6_0_OR_GREATER
                 case ArrowTypeId.Time32:
                     return (array, index) => ((Time32Array)array).GetTime(index);
@@ -282,7 +294,9 @@ public static class IArrowArrayExtensions
                 case ArrowTypeId.List:
                     return (array, index) => ((ListArray)array).GetSlicedValues(index);
                 case ArrowTypeId.Struct:
-                    return (array, index) => resultType == StructResultType.JsonString ? SerializeToJson((StructArray)array, index) : ParseStructArray((StructArray)array, index) ;
+                    return resultType == StructResultType.JsonString ?
+                        (array, index) => SerializeToJson((StructArray)array, index) :
+                        (array, index) => ParseStructArray((StructArray)array, index);
 
                     // not covered:
                     // -- map array
@@ -299,21 +313,20 @@ public static class IArrowArrayExtensions
         /// </summary>
         private static string SerializeToJson(StructArray structArray, int index)
         {
-            ExpandoObject? obj = ParseStructArray(structArray, index);
+            Dictionary<string, object?>? obj = ParseStructArray(structArray, index);
 
             return JsonSerializer.Serialize(obj);
         }
 
         /// <summary>
-        /// Converts an item in the StructArray at the index position to an ExpandoObject.
+        /// Converts an item in the StructArray at the index position to a Dictionary<string, object?>.
         /// </summary>
-        private static ExpandoObject? ParseStructArray(StructArray structArray, int index)
+        private static Dictionary<string, object?>? ParseStructArray(StructArray structArray, int index)
         {
             if (structArray.IsNull(index))
                 return null;
 
-            var expando = new ExpandoObject();
-            var jsonDictionary = (IDictionary<string, object?>)expando;
+            Dictionary<string, object?> jsonDictionary = new Dictionary<string, object?>();
 
             StructType structType = (StructType)structArray.Data.DataType;
             for (int i = 0; i < structArray.Data.Children.Length; i++)
@@ -323,7 +336,7 @@ private static string SerializeToJson(StructArray structArray, int index)
 
                 if (value is StructArray structArray1)
                 {
-                    List<ExpandoObject?> children = new List<ExpandoObject?>();
+                    List<Dictionary<string, object?>?> children = new List<Dictionary<string, object?>?>();
 
                     for (int j = 0; j < structArray1.Length; j++)
                     {
@@ -363,7 +376,7 @@ private static string SerializeToJson(StructArray structArray, int index)
                 }
             }
 
-            return expando;
+            return jsonDictionary;
         }
 
         /// <summary>

csharp/src/Client/SchemaConverter.cs

@@ -16,10 +16,10 @@
 */
 
 using System;
+using System.Collections.Generic;
 using System.Data;
 using System.Data.Common;
 using System.Data.SqlTypes;
-using System.Dynamic;
 using Apache.Arrow.Scalars;
 using Apache.Arrow.Types;
 
@@ -194,7 +194,7 @@ public static Type GetArrowType(Field f, DecimalBehavior decimalBehavior, Struct
                     return typeof(string);
 
                 case ArrowTypeId.Struct:
-                    return  structBehavior == StructBehavior.JsonString ? typeof(string) : typeof(ExpandoObject);
+                    return  structBehavior == StructBehavior.JsonString ? typeof(string) : typeof(Dictionary<string, object?>);
 
                 case ArrowTypeId.Timestamp:
                     return typeof(DateTimeOffset);

csharp/src/Client/readme.md

@@ -80,5 +80,5 @@ These properties are:
 
 - __AdbcConnectionTimeout__ - This specifies the connection timeout value. The value needs to be in the form (driver.property.name, integer, unit) where the unit is one of `s` or `ms`, For example, `AdbcConnectionTimeout=(adbc.snowflake.sql.client_option.client_timeout,30,s)` would set the connection timeout to 30 seconds.
 - __AdbcCommandTimeout__ - This specifies the command timeout value. This follows the same pattern as `AdbcConnectionTimeout` and sets the `AdbcCommandTimeoutProperty` and `CommandTimeout` values on the `AdbcCommand` object.
-- __StructBehavior__ - This specifies the StructBehavior when working with Arrow Struct arrays. The valid values are `JsonString` (the default) or `Strict` (treat the struct as a native type). If using JsonString, the return ArrowType will be StringType and a string value. If using Strict, the return ArrowType will be StructType and an ExpandoObject.
+- __StructBehavior__ - This specifies the StructBehavior when working with Arrow Struct arrays. The valid values are `JsonString` (the default) or `Strict` (treat the struct as a native type). If using JsonString, the return ArrowType will be StringType and the result a string value. If using Strict, the return ArrowType will be StructType and the result a Dictionary<string, object?>.
 - __DecimalBehavior__ - This specifies the DecimalBehavior when parsing decimal values from Arrow libraries. The valid values are `UseSqlDecimal` or `OverflowDecimalAsString` where values like Decimal256 are treated as strings.

csharp/src/Drivers/BigQuery/BigQueryStatement.cs

@@ -374,7 +374,7 @@ sealed class ReadRowsStream : Stream
             ReadOnlyMemory<byte> currentBuffer;
             bool first;
             int position;
-            bool hasRows = true;
+            bool hasRows;
 
             public ReadRowsStream(IAsyncEnumerator<ReadRowsResponse> response)
             {
@@ -383,6 +383,7 @@ public ReadRowsStream(IAsyncEnumerator<ReadRowsResponse> response)
                 if (response.Current != null)
                 {
                     this.currentBuffer = response.Current.ArrowSchema.SerializedSchema.Memory;
+                    this.hasRows = true;
                 }
                 else
                 {
@@ -393,7 +394,7 @@ public ReadRowsStream(IAsyncEnumerator<ReadRowsResponse> response)
                 this.first = true;
             }
 
-            public bool HasRows { get => this.hasRows; }
+            public bool HasRows => this.hasRows;
 
             public override bool CanRead => true;
 

csharp/test/Apache.Arrow.Adbc.Tests/ClientTests.cs

@@ -21,7 +21,6 @@
 using System.Collections.ObjectModel;
 using System.Data;
 using System.Data.Common;
-using System.Dynamic;
 using System.Linq;
 using Apache.Arrow.Adbc.Client;
 using Apache.Arrow.Types;
@@ -279,15 +278,15 @@ static void AssertTypeAndValue(
                     {
                         bool areEqual = false;
 
-                        if (value is ExpandoObject)
+                        if (value is Dictionary<string, object?>)
                         {
                             if (value == null && ctv.ExpectedValue == null)
                             {
                                 areEqual = true;
                             }
                             else
                             {
-                                areEqual = AreExpandoObjectsEqual(value as ExpandoObject, ctv.ExpectedValue as ExpandoObject);
+                                areEqual = AreDictionariesEqual(value as Dictionary<string, object?>, ctv.ExpectedValue as Dictionary<string, object?>);
                             }
                         }
                         else
@@ -332,39 +331,34 @@ static void AssertTypeAndValue(
             }
         }
 
-        static bool AreExpandoObjectsEqual(ExpandoObject? obj1, ExpandoObject? obj2)
+        static bool AreDictionariesEqual(Dictionary<string, object?>? dict1, Dictionary<string, object?>? dict2)
         {
-            if (obj1 == null && obj2 == null)
+            if (dict1 == null && dict2 == null)
             {
                 return true;
             }
-            else if (obj1 != null && obj2 == null)
+            else if (dict1 != null && dict2 == null)
             {
                 return false;
             }
-            else if (obj1 == null && obj2 != null)
+            else if (dict1 == null && dict2 != null)
             {
                 return false;
             }
 
-            var dict1 = (IDictionary<string, object?>)obj1!;
-            var dict2 = (IDictionary<string, object?>)obj2!;
-
-            if (dict1.Count != dict2.Count)
+            if (dict1!.Count != dict2!.Count)
                 return false;
 
             foreach (var key in dict1.Keys)
             {
-                if (!dict2.ContainsKey(key))
+                if (!dict2.TryGetValue(key, out object? value2))
                     return false;
 
                 object? value1 = dict1[key];
-                object? value2 = dict2[key];
 
-                if (value1 is ExpandoObject expando1 && value2 is ExpandoObject expando2)
+                if (value1 is Dictionary<string, object?> nextObj1 && value2 is Dictionary<string, object?> nextObj2)
                 {
-                    // Recursively compare nested ExpandoObjects
-                    if (!AreExpandoObjectsEqual(expando1, expando2))
+                    if (!AreDictionariesEqual(nextObj1, nextObj2))
                         return false;
                 }
                 else if (!object.Equals(value1, value2))

csharp/test/Drivers/BigQuery/BigQueryData.cs

@@ -44,10 +44,9 @@ public static SampleDataBuilder GetSampleData()
 
             SampleDataBuilder sampleDataBuilder = new SampleDataBuilder();
 
-            ExpandoObject person = new ExpandoObject();
-            IDictionary<string, object?> keyValues = (IDictionary<string, object?>)person;
-            keyValues["name"] = "John Doe";
-            keyValues["age"] = 30L;
+            Dictionary<string, object?> person = new Dictionary<string, object?>();
+            person["name"] = "John Doe";
+            person["age"] = 30L;
 
             // StructBehavior = "Strict"
             sampleDataBuilder.Samples.Add(
@@ -58,7 +57,7 @@ public static SampleDataBuilder GetSampleData()
                    StructBehavior = "Strict",
                    ExpectedValues = new List<ColumnNetTypeArrowTypeValue>()
                    {
-                        new ColumnNetTypeArrowTypeValue("person", typeof(ExpandoObject), typeof(StructType), person),
+                        new ColumnNetTypeArrowTypeValue("person", typeof(Dictionary<string, object?>), typeof(StructType), person),
                    }
                });
 
@@ -116,7 +115,7 @@ public static SampleDataBuilder GetSampleData()
                                     new ColumnNetTypeArrowTypeValue("point", typeof(string), typeof(StringType), "POINT(1 2)"),
                                     new ColumnNetTypeArrowTypeValue("numbers", typeof(Int64Array), typeof(ListType), numbersArray),
 
-                                    new ColumnNetTypeArrowTypeValue("person", typeof(ExpandoObject), typeof(StructType), person),
+                                    new ColumnNetTypeArrowTypeValue("person", typeof(Dictionary<string, object?>), typeof(StructType), person),
                                     new ColumnNetTypeArrowTypeValue("json", typeof(string), typeof(StringType), "{\"age\":29,\"name\":\"Jane Doe\"}")
                     }
                 });