Spanner now supports the following new columns in the SPANNER_SYS query statistics table
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## Feature
Spanner now supports the following new columns in the `SPANNER_SYS` [query statistics](https://cloud.google.com/spanner/docs/introspection/query-statistics) table:
* `AVG_MEMORY_PEAK_USAGE_BYTES`
* `AVG_MEMORY_USAGE_PERCENTAGE`
* `AVG_QUERY_PLAN_CREATION_TIME_SECS`
* `AVG_FILESYSTEM_DELAY_SECS`
* `AVG_REMOTE_SERVER_CALLS`
* `AVG_ROWS_SPOOLED`