rdblue commented on code in PR #9008:
URL: https://github.com/apache/iceberg/pull/9008#discussion_r1483624801


##########
api/src/main/java/org/apache/iceberg/expressions/ExpressionUtil.java:
##########
@@ -564,14 +569,26 @@ private static String sanitizeDate(int days, int today) {
     return "(date)";
   }
 
-  private static String sanitizeTimestamp(long micros, long now) {
-    String isPast = now > micros ? "ago" : "from-now";
-    long diff = Math.abs(now - micros);
-    if (diff < FIVE_MINUTES_IN_MICROS) {
+  private static String sanitizeTimestamp(ChronoUnit unit, long timeUnits, 
long nowMillis) {
+    long timeMillis;
+    switch (unit) {
+      case MICROS:
+        timeMillis = DateTimeUtil.microsToMillis(timeUnits);
+        break;
+      case NANOS:
+        timeMillis = DateTimeUtil.nanosToMillis(timeUnits);

Review Comment:
   @epgif, why does the addition of nanosecond precision require switching 
`now` throughout this file from microseconds to nanoseconds? It seems to me 
that this could remain as it was.



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