Hi everyone, according to the SupportsReadableMetadata interface, the planner is supposed to project required metadata columns prior to applying them:
> The planner will select required metadata columns (i.e. perform projection push down) and will call applyReadableMetadata(List, DataType) with a list of metadata keys. However, from my experiments it seems that this is not true: regardless of what columns I select from a table, #applyReadableMetadata always seems to be called with all metadata declared in the schema of the table. Metadata columns are also excluded from SupportsProjectionPushDown#applyProjection, so the source cannot perform the projection either. This is in Flink 1.13.2. Am I misreading the docs here or is this not working as intended? Best Ingo
