huaxingao commented on code in PR #14700:
URL: https://github.com/apache/iceberg/pull/14700#discussion_r2578846346
##########
api/src/main/java/org/apache/iceberg/util/UUIDUtil.java:
##########
@@ -78,4 +81,29 @@ public static ByteBuffer convertToByteBuffer(UUID value,
ByteBuffer reuse) {
buffer.putLong(8, value.getLeastSignificantBits());
return buffer;
}
+
+ /**
+ * Generate a RFC 9562 UUIDv7 string.
+ *
+ * <p>Layout: - 48-bit Unix epoch milliseconds - 4-bit version (0b0111) -
12-bit random (rand_a) -
+ * 2-bit variant (RFC 4122, 0b10) - 62-bit random (rand_b)
+ */
+ public static String generateUuidV7() {
+ long epochMs = System.currentTimeMillis();
+ if ((epochMs >>> 48) != 0) {
+ throw new IllegalArgumentException("timestamp does not fit within 48
bits: " + epochMs);
+ }
+
+ long randA = SECURE_RANDOM.nextLong() & 0xFFFL; // 12 bits
Review Comment:
Switched to a single SecureRandom.nextBytes. Thanks for the suggestion!
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