maropu commented on a change in pull request #25410: [SPARK-28690][SQL] Add 
`date_part` function for timestamps/dates
URL: https://github.com/apache/spark/pull/25410#discussion_r314582126
 
 

 ##########
 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
 ##########
 @@ -1963,3 +1963,77 @@ case class Epoch(child: Expression, timeZoneId: 
Option[String] = None)
     defineCodeGen(ctx, ev, c => s"$dtu.getEpoch($c, $zid)")
   }
 }
+
+@ExpressionDescription(
+  usage = "_FUNC_(field, source) - Extracts a part of the date/timestamp.",
+  arguments = """
+    Arguments:
+      * field - selects which part of the source should be extracted. 
Supported string values are:
+                ["MILLENNIUM", "MILLENNIA", "MIL", "MILS",
+                 "CENTURY", "CENTURIES", "C", "CENT",
+                 "DECADE", "DECADES", "DEC", "DECS",
+                 "YEAR", "Y", "YEARS", "YR", "YRS",
+                 "ISOYEAR",
+                 "QUARTER", "QTR",
+                 "MONTH", "MON", "MONS", "MONTHS",
+                 "WEEK", "W", "WEEKS",
+                 "DAY", "D", "DAYS",
+                 "DAYOFWEEK", "DOW", "ISODOW", "DOY",
+                 "HOUR", "H", "HOURS", "HR", "HRS",
+                 "MINUTE", "M", "MIN", "MINS", "MINUTES",
+                 "SECOND", "S", "SEC", "SECONDS", "SECS",
+                 "MILLISECONDS", "MSEC", "MSECS", "MILLISECON", "MSECONDS", 
"MS",
+                 "MICROSECONDS", "USEC", "USECS", "USECONDS", "MICROSECON", 
"US",
+                 "EPOCH"]
 
 Review comment:
   How about using parentheses for these alternatives like this?
   ```
         * field - selects which part of the source should be extracted. 
Supported string values are:
                   ["MILLENNIUM" ("MILLENNIA", "MIL", "MILS"),
                    "CENTURY" ("CENTURIES", "C", "CENT"),
                    "DECADE" ("DECADES", "DEC", "DECS"),
                    "YEAR" ("Y", "YEARS", "YR", "YRS"),
                    "ISOYEAR",
                    "QUARTER" ("QTR"),
                    "MONTH" ("MON", "MONS", "MONTHS"),
                    "WEEK" ("W", "WEEKS"),
                    "DAY" ("D", "DAYS"),
                    "DAYOFWEEK" ("DOW", "ISODOW", "DOY"),
                    "HOUR" ("H", "HOURS", "HR", "HRS"),
                    "MINUTE" ("M", "MIN", "MINS", "MINUTES"),
                    "SECOND" ("S", "SEC", "SECONDS", "SECS"),
                    "MILLISECONDS" ("MSEC", "MSECS", "MILLISECON", "MSECONDS", 
"MS"),
                    "MICROSECONDS" ("USEC", "USECS", "USECONDS", "MICROSECON", 
"US"),
                    "EPOCH"]
   ```

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