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

    https://github.com/apache/spark/pull/19002#discussion_r134140826
  
    --- Diff: 
external/docker-integration-tests/src/test/scala/org/apache/spark/sql/jdbc/OracleIntegrationSuite.scala
 ---
    @@ -255,6 +256,18 @@ class OracleIntegrationSuite extends 
DockerJDBCIntegrationSuite with SharedSQLCo
         val df = dfRead.filter(dfRead.col("date_type").lt(dt))
           .filter(dfRead.col("timestamp_type").lt(ts))
     
    +    val parentPlan = df.queryExecution.executedPlan
    +    assert(parentPlan.isInstanceOf[WholeStageCodegenExec])
    +    val node = parentPlan.asInstanceOf[WholeStageCodegenExec]
    +    val metadata = node.child.asInstanceOf[RowDataSourceScanExec].metadata
    +    // The "PushedFilters" part should be exist in Dataframe's
    +    // physical plan and the existence of right literals in
    +    // "PushedFilters" is used to prove that the predicates
    +    // pushing down have been effective.
    +    assert(metadata.get("PushedFilters").ne(None))
    --- End diff --
    
    nit: Could we use `isDefined` instead of `ne(None)`?


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