From f60ca2d55d899eda0070ef25d416fbad21aeac65 Mon Sep 17 00:00:00 2001
From: Shay Rojansky <roji@roji.org>
Date: Sun, 6 Mar 2022 12:21:55 +0100
Subject: [PATCH] Fixed bug if multiple bulk inserts are used in the same batch

---
 .../Update/Internal/SqlServerModificationCommandBatch.cs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/EFCore.SqlServer/Update/Internal/SqlServerModificationCommandBatch.cs b/src/EFCore.SqlServer/Update/Internal/SqlServerModificationCommandBatch.cs
index f5d82082d0d..2d2429f88c6 100644
--- a/src/EFCore.SqlServer/Update/Internal/SqlServerModificationCommandBatch.cs
+++ b/src/EFCore.SqlServer/Update/Internal/SqlServerModificationCommandBatch.cs
@@ -163,7 +163,14 @@ private void AppendBulkInsertCommandText(int lastIndex)
 
         if (resultsContainPositionMapping)
         {
-            ResultsPositionalMappingEnabled ??= new BitArray(CommandResultSet.Count);
+            if (ResultsPositionalMappingEnabled is null)
+            {
+                ResultsPositionalMappingEnabled = new BitArray(CommandResultSet.Count);
+            }
+            else
+            {
+                ResultsPositionalMappingEnabled.Length = CommandResultSet.Count;
+            }
 
             for (var i = lastIndex - _bulkInsertCommands.Count; i < lastIndex; i++)
             {