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

    https://github.com/apache/spark/pull/18252#discussion_r121246583
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala
 ---
    @@ -32,7 +32,7 @@ import org.apache.spark.unsafe.types.UTF8String
      * Helper functions for converting between internal and external date and 
time representations.
      * Dates are exposed externally as java.sql.Date and are represented 
internally as the number of
      * dates since the Unix epoch (1970-01-01). Timestamps are exposed 
externally as java.sql.Timestamp
    - * and are stored internally as longs, which are capable of storing 
timestamps with 100 nanosecond
    + * and are stored internally as longs, which are capable of storing 
timestamps with microsecond
    --- End diff --
    
    100 ns is different from micro, isn't it?


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