lvyanquan commented on code in PR #4495:
URL: https://github.com/apache/flink-cdc/pull/4495#discussion_r3742484826
##########
flink-cdc-runtime/src/main/java/org/apache/flink/cdc/runtime/functions/impl/TemporalFunctions.java:
##########
@@ -71,6 +76,94 @@ public static LocalDate currentDate(long epochTime, String
timezone) {
return localtimestamp(epochTime, timezone).toLocalDate();
}
+ public static Long extract(String unit, TemporalAccessor temporal, String
timezone) {
+ if (temporal == null) {
+ return null;
+ }
+ if (temporal instanceof Instant) {
+ temporal = ((Instant) temporal).atZone(ZoneId.of(timezone));
+ }
+ switch (unit) {
+ case "YEAR":
+ return getTemporalField(temporal, ChronoField.YEAR, unit);
+ case "QUARTER":
+ return getTemporalField(temporal, IsoFields.QUARTER_OF_YEAR,
unit);
+ case "MONTH":
+ return getTemporalField(temporal, ChronoField.MONTH_OF_YEAR,
unit);
+ case "WEEK":
+ return getTemporalField(temporal,
IsoFields.WEEK_OF_WEEK_BASED_YEAR, unit);
+ case "DAY":
+ return getTemporalField(temporal, ChronoField.DAY_OF_MONTH,
unit);
+ case "DOY":
+ return getTemporalField(temporal, ChronoField.DAY_OF_YEAR,
unit);
+ case "DOW":
+ // SQL DOW starts with Sunday as 1, while ISO starts with
Monday as 1.
+ return getTemporalField(temporal, ChronoField.DAY_OF_WEEK,
unit) % 7 + 1;
+ case "HOUR":
+ return getTemporalField(temporal, ChronoField.HOUR_OF_DAY,
unit);
+ case "MINUTE":
+ return getTemporalField(temporal, ChronoField.MINUTE_OF_HOUR,
unit);
+ case "SECOND":
+ return getTemporalField(temporal,
ChronoField.SECOND_OF_MINUTE, unit);
+ default:
+ throw new IllegalArgumentException("Unsupported EXTRACT unit:
" + unit);
+ }
+ }
+
+ private static long getTemporalField(
+ TemporalAccessor temporal, java.time.temporal.TemporalField field,
String unit) {
Review Comment:
Avoid using fully qualified names.
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