panic: assignment to entry in nil map

[P4mpur]

Describe the bug

'panic: assignment to entry in nil map [recovered, repanicked]
goroutine 1787 [running]:
sync.(*WaitGroup).Go.func1.1()
sync/waitgroup.go:251 +0x45
panic({0xc098e0?, 0x137fa10?})
runtime/panic.go:860 +0x13a
github.com/VictoriaMetrics/VictoriaLogs/lib/logstorage.(*statsUniqValuesProcessor).mergeState(0x334119ffe000, 0x334119db7730?, {0xe17dc0?, 0x334119cea600?}, {0xe1efc0?, 0x33411a136000?})
github.com/VictoriaMetrics/VictoriaLogs@v1.47.1-0.20260225221819-a408207c2242/lib/logstorage/stats_uniq_values.go:155 +0x1d4
github.com/VictoriaMetrics/VictoriaLogs/lib/logstorage.(*pipeStatsGroup).mergeState(...)
github.com/VictoriaMetrics/VictoriaLogs@v1.47.1-0.20260225221819-a408207c2242/lib/logstorage/pipe_stats.go:950
github.com/VictoriaMetrics/VictoriaLogs/lib/logstorage.(*pipeStatsGroupMap).mergeState(0x33411a412040, 0x33411a274708, 0x33411a25e040, 0x334119d0a000)
github.com/VictoriaMetrics/VictoriaLogs@v1.47.1-0.20260225221819-a408207c2242/lib/logstorage/pipe_stats.go:513 +0x5c2
github.com/VictoriaMetrics/VictoriaLogs/lib/logstorage.(*pipeStatsProcessor).mergeShardsParallel.func2()
github.com/VictoriaMetrics/VictoriaLogs@v1.47.1-0.20260225221819-a408207c2242/lib/logstorage/pipe_stats.go:1226 +0x10f
sync.(*WaitGroup).Go.func1()
sync/waitgroup.go:258 +0x4a
created by sync.(*WaitGroup).Go in goroutine 1806
sync/waitgroup.go:238 +0x73`

i see that it's fixed in victorialogs 1.52.0, while VT still uses 1.51.0 VL backend.

To Reproduce

This issue explains how to reproduce this exact problem
VictoriaMetrics/VictoriaLogs#1383

Version

victoriametrics/victoria-traces:v0.10.0

Logs

No response

Screenshots

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Used command-line flags

No response

Additional information

No response

[jiekun]

Thank you. I'm working on updating the dependency to v1.52.0 and fix this issue in the meantime. Please track it with #251

[jiekun]

This is fixed by #251 and will be included in the next release.