[GitHub] [spark] yaooqinn commented on a change in pull request #27906: [SPARK-31150][SQL] Parsing seconds fraction with variable length for timestamp

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yaooqinn commented on a change in pull request #27906: [SPARK-31150][SQL] Parsing seconds fraction with variable length for timestamp
URL: https://github.com/apache/spark/pull/27906#discussion_r392879558
 
 

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 File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/csv/CSVInferSchema.scala
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 @@ -34,7 +34,8 @@ class CSVInferSchema(val options: CSVOptions) extends Serializable {
     options.timestampFormat,
     options.zoneId,
     options.locale,
-    legacyFormat = FAST_DATE_FORMAT)
+    legacyFormat = FAST_DATE_FORMAT,
+    varLenEnabled = options.timestampFormat.contains('S'))
 
 Review comment:
   I have updated this, and mv the cache optimization to `DateTimeFormatterHelper`

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