voonhous commented on issue #19688:
URL: https://github.com/apache/hudi/issues/19688#issuecomment-5414814375

   Pre-existing, surfaced by #19687's legacy-relation leg: 
`BaseFileOnlyRelation.buildScan` with an empty projection (`count()`) under 
schema-on-read NPEs in `HoodieBaseRelation.projectSchema` -> 
`InternalSchemaUtils.pruneInternalSchema([])` (null record in 
`InternalSchema.buildIdToName`); unreachable from batch SQL (DefaultSource 
routes to the file-group-reader relations), reachable for streaming reads with 
the file group reader disabled and for metadata-table reads.
   


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