leonardBang commented on a change in pull request #14280:
URL: https://github.com/apache/flink/pull/14280#discussion_r555055866
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File path:
flink-table/flink-table-planner-blink/src/main/java/org/apache/flink/table/planner/functions/aggfunctions/FirstValueAggFunction.java
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@@ -83,7 +83,7 @@ public void accumulate(RowData rowData, Object value) {
GenericRowData acc = (GenericRowData) rowData;
if (value != null && acc.getLong(1) == Long.MAX_VALUE) {
acc.setField(0, value);
- acc.setField(1, System.currentTimeMillis());
+ acc.setField(1, System.nanoTime());
Review comment:
The `System.nanoTime()` has higher precision but it can not be used in
different JVMs because every JVM because there's no guarantee that nanoTime is
relative to any timebase.
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