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CLICKHOUSEDOCS-582: Column timestamp_ns in system.trace_log (#10287)

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Co-authored-by: Sergei Shtykov <bayonet@yandex-team.ru>
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docs/en/operations/system_tables.md
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@ -709,7 +709,7 @@ When the table is deleted manually, it will be automatically created on the fly.
You can specify an arbitrary partitioning key for the `system.query_thread_log` table in the [query\_thread\_log](server_configuration_parameters/settings.md#server_configuration_parameters-query-thread-log) server setting (see the `partition_by` parameter).
## system.trace\_log {#system_tables-trace_log}
## system.trace_log {#system_tables-trace_log}
Contains stack traces collected by the sampling query profiler.
@ -719,24 +719,26 @@ To analyze logs, use the `addressToLine`, `addressToSymbol` and `demangle` intro
Columns:
- `event_date`([Date](../sql_reference/data_types/date.md)) — Date of sampling moment.
- `event_date` ([Date](../sql_reference/data_types/date.md)) — Date of sampling moment.
- `event_time`([DateTime](../sql_reference/data_types/datetime.md)) — Timestamp of sampling moment.
- `event_time` ([DateTime](../sql_reference/data_types/datetime.md)) — Timestamp of the sampling moment.
- `revision`([UInt32](../sql_reference/data_types/int_uint.md)) — ClickHouse server build revision.
- `timestamp_ns` ([UInt64](../sql_reference/data_types/int_uint.md)) — Timestamp of the sampling moment in nanoseconds.
- `revision` ([UInt32](../sql_reference/data_types/int_uint.md)) — ClickHouse server build revision.
When connecting to server by `clickhouse-client`, you see the string similar to `Connected to ClickHouse server version 19.18.1 revision 54429.`. This field contains the `revision`, but not the `version` of a server.
- `timer_type`([Enum8](../sql_reference/data_types/enum.md)) — Timer type:
- `timer_type` ([Enum8](../sql_reference/data_types/enum.md)) — Timer type:
- `Real` represents wall-clock time.
- `CPU` represents CPU time.
- `thread_number`([UInt32](../sql_reference/data_types/int_uint.md)) — Thread identifier.
- `thread_number` ([UInt32](../sql_reference/data_types/int_uint.md)) — Thread identifier.
- `query_id`([String](../sql_reference/data_types/string.md)) — Query identifier that can be used to get details about a query that was running from the [query\_log](#system_tables-query_log) system table.
- `query_id` ([String](../sql_reference/data_types/string.md)) — Query identifier that can be used to get details about a query that was running from the [query\_log](#system_tables-query_log) system table.
- `trace`([Array(UInt64)](../sql_reference/data_types/array.md)) — Stack trace at the moment of sampling. Each element is a virtual memory address inside ClickHouse server process.
- `trace` ([Array(UInt64)](../sql_reference/data_types/array.md)) — Stack trace at the moment of sampling. Each element is a virtual memory address inside ClickHouse server process.
**Example**