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Use Memory Stream for Serialization #2886

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Use Memory Stream for Serialization #2886

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13 changes: 11 additions & 2 deletions src/Core/Resolvers/QueryExecutor.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -589,8 +589,17 @@ public async Task<JsonArray> GetJsonArrayAsync(
{
if (dbResultSetRow.Columns.Count > 0)
{
JsonElement result =
JsonSerializer.Deserialize<JsonElement>(JsonSerializer.Serialize(dbResultSetRow.Columns));
// Use a memory stream to serialize the columns
using MemoryStream ms = new();
using (Utf8JsonWriter writer = new(ms))
{
JsonSerializer.Serialize(writer, dbResultSetRow.Columns);
}

ms.Position = 0;
using JsonDocument doc = JsonDocument.Parse(ms);
Comment on lines +593 to +600
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Copilot AI Sep 25, 2025

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This approach may not resolve the original OOM issue and could introduce performance overhead. The MemoryStream still allocates memory internally, and you're now creating additional objects (MemoryStream, Utf8JsonWriter, JsonDocument). Consider using JsonSerializer.SerializeToUtf8Bytes() and JsonSerializer.Deserialize() with ReadOnlySpan for better memory efficiency.

Suggested change
using MemoryStream ms = new();
using (Utf8JsonWriter writer = new(ms))
{
JsonSerializer.Serialize(writer, dbResultSetRow.Columns);
}
ms.Position = 0;
using JsonDocument doc = JsonDocument.Parse(ms);
byte[] jsonBytes = JsonSerializer.SerializeToUtf8Bytes(dbResultSetRow.Columns);
using JsonDocument doc = JsonDocument.Parse(jsonBytes);

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JsonElement result = doc.RootElement.Clone();

// FromJsonElement() added to address .NET8 regression where the .Add() throws:
// System.InvalidOperationException: "The element cannot be an object or array."
resultArray.Add(FromJsonElement(result));
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