FluorineDog commented on issue #23206: [SPARK-26249][SQL] Add ability to inject 
a rule in order and to add a batch via the Spark Extension Points API
URL: https://github.com/apache/spark/pull/23206#issuecomment-576328714
 
 
   @maropu  @skambha 
   Hi, we are ready to inject a `Batch` of `Rule[LogicalPlan]`, which should be 
executed once, into the optimizer. However, the current public API 
`injectOptimizerRule` puts all rules into a `fixedPoint` batch, so we believe 
that we have to use `postHocOptimizationBatches`.
   
   Sadly, we fail to find demos/documents to play around with this "advanced" 
API, and we keep getting stuck at tons of `private` APIs like 
`internal.SessionState` when implementing our own SparkSession. 
   
   I believe it may do us some good to expose APIs to play around these 
optimation batches. 
   
   

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