HyukjinKwon commented on a change in pull request #28593:
URL: https://github.com/apache/spark/pull/28593#discussion_r428422910



##########
File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala
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@@ -1277,7 +1285,11 @@ abstract class CastBase extends UnaryExpression with 
TimeZoneAwareExpression wit
     val block = inline"new java.math.BigDecimal($MICROS_PER_SECOND)"
     code"($d.toBigDecimal().bigDecimal().multiply($block)).longValue()"
   }
-  private[this] def longToTimeStampCode(l: ExprValue): Block = code"$l * 
(long)$MICROS_PER_SECOND"
+  private[this] def longToTimeStampCode(l: ExprValue): Block = {
+    if (SQLConf.get.numericConvertToTimestampInSeconds) code"" +

Review comment:
       Let's change `l` to something else per 
https://github.com/databricks/scala-style-guide#variable-naming while we're 
here.




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