macroguo-ghy commented on code in PR #4833:
URL: https://github.com/apache/calcite/pull/4833#discussion_r2936860911
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file/src/main/java/org/apache/calcite/adapter/file/CsvEnumerator.java:
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@@ -76,20 +75,35 @@ public class CsvEnumerator<E> implements Enumerator<E> {
private final RowConverter<E> rowConverter;
private @Nullable E current;
- private static final FastDateFormat TIME_FORMAT_DATE;
- private static final FastDateFormat TIME_FORMAT_TIME;
- private static final FastDateFormat TIME_FORMAT_TIMESTAMP;
+ private static final TimeZone GMT = TimeZone.getTimeZone("GMT");
Review Comment:
[FastDateFormat](https://github.com/apache/commons-lang/blob/487ba4d9a60e678be874ceb9274384268bb32a13/src/main/java/org/apache/commons/lang3/time/FastDateFormat.java#L78)
is a fast and thread-safe version of SimpleDateFormat
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