feat(csharp/src/Drivers/Databricks): Added decimalColumnScale connection param

csharp/src/Drivers/Databricks/DatabricksConnection.cs

@@ -83,6 +83,9 @@ internal class DatabricksConnection : SparkHttpConnection
         // Identity federation client ID for token exchange
         private string? _identityFederationClientId;
 
+        // Decimal column scale
+        private int _decimalColumnScale = 10;
+
         // Default namespace
         private TNamespace? _defaultNamespace;
 
@@ -386,6 +389,23 @@ private void ValidateProperties()
             {
                 _identityFederationClientId = identityFederationClientId;
             }
+
+            if (Properties.TryGetValue(DatabricksParameters.DecimalColumnScale, out string? decimalColumnScaleStr))
+            {
+                if (int.TryParse(decimalColumnScaleStr, out int decimalColumnScaleValue))
+                {
+                    if (decimalColumnScaleValue < 0)
+                    {
+                        throw new ArgumentOutOfRangeException(DatabricksParameters.DecimalColumnScale, decimalColumnScaleValue,
+                            "DecimalColumnScale must be positive. Default value is 10.");
+                    }
+                    _decimalColumnScale = decimalColumnScaleValue;
+                }
+                else
+                {
+                    throw new ArgumentException($"Parameter '{DatabricksParameters.DecimalColumnScale}' value '{decimalColumnScaleStr}' could not be parsed. Must be a positive integer.");
+                }
+            }
         }
 
         /// <summary>
@@ -448,6 +468,11 @@ protected internal override bool TrySetGetDirectResults(IRequest request)
         /// </summary>
         public bool RunAsyncInThrift => _runAsyncInThrift;
 
+        /// <summary>
+        /// Gets the decimal column scale value.
+        /// </summary>
+        public int DecimalColumnScale => _decimalColumnScale;
+
         /// <summary>
         /// Gets a value indicating whether to retry requests that receive a 503 response with a Retry-After header.
         /// </summary>

csharp/src/Drivers/Databricks/DatabricksParameters.cs

@@ -228,6 +228,12 @@ public class DatabricksParameters : SparkParameters
         /// Default value is false if not specified.
         /// </summary>
         public const string DriverConfigTakePrecedence = "adbc.databricks.driver_config_take_precedence";
+
+        /// <summary>
+        /// The scale for decimal columns.
+        /// Default value is 10 if not specified.
+        /// </summary>
+        public const string DecimalColumnScale = "adbc.databricks.decimal_column_scale";
     }
 
     /// <summary>