diff --git a/csharp/src/FlatColumnsResultBuilder.cs b/csharp/src/FlatColumnsResultBuilder.cs
index 30ae73e0..b412dc84 100644
--- a/csharp/src/FlatColumnsResultBuilder.cs
+++ b/csharp/src/FlatColumnsResultBuilder.cs
@@ -71,8 +71,14 @@ internal static QueryResult BuildFlatColumnsResult(
 
                     if (info.Precision[i].HasValue) columnSizeBuilder.Append(info.Precision[i]!.Value); else columnSizeBuilder.AppendNull();
 
-                    int? bufLen = ColumnMetadataHelper.GetBufferLength(info.TypeName[i]);
-                    if (bufLen.HasValue) bufferLengthBuilder.Append(bufLen.Value); else bufferLengthBuilder.AppendNull();
+                    // BUFFER_LENGTH is an ODBC carryover (SQLColumns col 8): the byte size an ODBC
+                    // application would allocate to bind/fetch the column into its own C buffer.
+                    // Managed APIs that own their buffers have no use for it, so JDBC marks it
+                    // "not used" — and ADBC even less so, since results are self-describing Arrow
+                    // (buffer sizes come from the column's type + data, not from a metadata field).
+                    // Always null here, matching the Thrift path and the SEA DESC TABLE EXTENDED path.
+                    // (ADBC surfaces the same field as xdbc_buffer_length.)
+                    bufferLengthBuilder.AppendNull();
 
                     if (info.Scale[i].HasValue) decimalDigitsBuilder.Append(info.Scale[i]!.Value); else decimalDigitsBuilder.AppendNull();
 
diff --git a/csharp/test/E2E/StatementTests.cs b/csharp/test/E2E/StatementTests.cs
index be3f28e4..17a6d92f 100644
--- a/csharp/test/E2E/StatementTests.cs
+++ b/csharp/test/E2E/StatementTests.cs
@@ -476,13 +476,11 @@ public async Task CanGetColumnsWithBaseTypeName()
             Assert.Equal(TestConfiguration.Metadata.ExpectedColumnCount, actualBatchLength);
         }
 
-        // TODO: PECO-3008 - CanGetColumnsExtended fails for SEA; investigate catalog/schema metadata path in StatementExecutionConnection
         [SkippableTheory]
         [InlineData("all_column_types", "Resources/create_table_all_types.sql", "Resources/result_get_column_extended_all_types.json", true, new[] { "PK_IS_NULLABLE:NO" })]
         [InlineData("all_column_types", "Resources/create_table_all_types.sql", "Resources/result_get_column_extended_all_types.json", false, new[] { "PK_IS_NULLABLE:YES" })]
         public async Task CanGetColumnsExtended(string tableName, string createTableSqlLocation, string resultLocation, bool useDescTableExtended, string[]? extraPlaceholdsInResult = null)
         {
-            Skip.If(TestConfiguration.Protocol == "rest", "SEA CanGetColumnsExtended returns different BUFFER_LENGTH values (PECO-3008)");
             var connectionParams = new Dictionary<string, string> { ["adbc.databricks.use_desc_table_extended"] = $"{useDescTableExtended}" };
 
             using AdbcConnection connection = NewConnection(TestConfiguration, connectionParams);