Support partial stats at extremes without specifying columns #127832
Description
Currently, we only support collecting partial statistics at extremes when a column is specified (eg. CREATE STATISTICS my_stat ON a FROM t USING EXTREMES). We should add support for partial stats collections without specifying a column (eg. CREATE STATISTICS my_stat FROM t USING EXTREMES).
This should collect partial stats on all appropriate columns automatically, similar to full stats collections without specified columns. We currently support partial statistics at extremes collections on single column prefixes of forward indexes.
Jira issue: CRDB-40629