Github user beyond1920 commented on a diff in the pull request:

    https://github.com/apache/flink/pull/2921#discussion_r90577312
  
    --- Diff: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/plan/nodes/dataset/BatchTableSourceScan.scala
 ---
    @@ -32,18 +31,20 @@ class BatchTableSourceScan(
         cluster: RelOptCluster,
         traitSet: RelTraitSet,
         table: RelOptTable,
    -    rowType: RelDataType)
    -  extends BatchScan(cluster, traitSet, table, rowType) {
    +    val tableSource: BatchTableSource[_])
    --- End diff --
    
    @wuchong , Thanks for your review. For later use, the projection pushdown 
rule needs to get the actual tablesource of the BatchTableSourceScan, then do 
something on it.


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