bug: Last error value is lost

[vitalyisaev2]

Bug Report

YDB GO SDK version:

v3.92.5

Environment

Linux, x86_64

Current behavior:

I came across a temporary error in a service using YDB SDK. But the reason (%!w(<nil>)) is not clear from the logs:

2024-11-29T15:50:52.463+0300	ERROR	server/service_connector.go:172	request handling failed	
{
  "service": "connector", 
  "method": "ReadSplits", 
  "test_name": "",
  "data_source_kind": "YDB",
  "host": "ydb.serverless.yandexcloud.net",
  "port": 2135, 
  "database": "/ru-central1/b1g918jf99v96n47o7u6/etn348380t0sf4eb4r2o",
  "use_tls": true, 
  "protocol": "NATIVE", 
  "split_id": 0, 
  "error": "read split 0: run paging streamer: write data to stream: read result: query: query 'SELECT `number` FROM `lost_numbers`' error: query do: pool.With failed with 1 attempts: non-retryable error occurred on attempt No.1 (idempotent=true): failed to get item from pool after 100 attempts and 1m40.153382923s, pool has 0 items (0 busy, 0 idle, 0 create_in_progress): %!w(<nil>) at `github.com/ydb-platform/ydb-go-sdk/v3/internal/pool.(*Pool).getItem(pool.go:706)` at `github.com/ydb-platform/ydb-go-sdk/v3/internal/pool.(*Pool).try(pool.go:353)` at `github.com/ydb-platform/ydb-go-sdk/v3/internal/pool.(*Pool).With.func2(pool.go:390)` at `github.com/ydb-platform/ydb-go-sdk/v3/retry.Retry.func1(retry.go:264)` at `github.com/ydb-platform/ydb-go-sdk/v3/retry.opWithRecover(retry.go:418)` at `github.com/ydb-platform/ydb-go-sdk/v3/retry.RetryWithResult(retry.go:358)` at `github.com/ydb-platform/ydb-go-sdk/v3/retry.Retry(retry.go:270)` at `github.com/ydb-platform/ydb-go-sdk/v3/internal/pool.(*Pool).With(pool.go:396)` at `github.com/ydb-platform/ydb-go-sdk/v3/internal/query.do(client.go:218)`"
}

Expected behavior:

Wrapped error must be initialized.

Steps to reproduce:

No steps to reproduce.

Related code:

It turns out that the lastErr is not initialized in some edge cases.