clintropolis opened a new pull request, #19711:
URL: https://github.com/apache/druid/pull/19711

   ### Description
   changes:
   * adds `DatasourceBaseTableMetadata`, a catalog model type describing the 
physical layout of a datasource 'base table'. This metadata is blended with the 
column declarations to produce a `BaseTableProjectionSpec` to pass to segment 
generation phase for MSQ insert and replace queries
   * adds `baseTable` property to `DatasourceDefn` (and friends) to wire up 
base table metadata in catalog stuff
   * adds `ClusteredValueGroupsBaseTableMetadata` implementation of 
`DatasourceBaseTableMetadata` which allows specifying that a datasource should 
produce clustered segments, containing the clustering column names and optional 
virtual column definitions. clustered catalog column definitions must match the 
order of column names in the clustering columns
   * tables with a base table spec must currently be sealed since the columns 
list defines the physical spec; validation handles this for virtual column 
inputs


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