lirui-apache commented on issue #8695: 
[FLINK-12805][FLINK-12808][FLINK-12809][table-api] Introduce 
PartitionableTableSource and PartitionableTableSink and OverwritableTableSink
URL: https://github.com/apache/flink/pull/8695#issuecomment-504006163
 
 
   > Because partition fields are part of the schema, table sink doesn't need 
to know the specific static partition, it can be get from records.
   
   Table sink can tell which columns are partition columns in a record. But 
without `setStaticPartitions `, how can it know which partition columns are 
static and which are dynamic?

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