Core: Z-order byte encoding for floating-point values is not order-preserving

[eye-gu]

Apache Iceberg version

None

Query engine

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Please describe the bug 🐞

iceberg/core/src/main/java/org/apache/iceberg/util/ZOrderByteUtils.java

Lines 102 to 108 in 49b89a8

	public static ByteBuffer floatingPointOrderedBytes(double val, ByteBuffer reuse) {
	ByteBuffer bytes = ByteBuffers.reuse(reuse, PRIMITIVE_BUFFER_SIZE);
	long lval = Double.doubleToLongBits(val);
	lval ^= ((lval >> (Integer.SIZE - 1)) | Long.MIN_VALUE);
	bytes.putLong(lval);
	return bytes;
	}

Here the shift is >> (Integer.SIZE - 1) = >> 31.The fix is a one-character change: >> (Integer.SIZE - 1) → >> (Long.SIZE - 1).

Willingness to contribute

• I can contribute a fix for this bug independently
• I would be willing to contribute a fix for this bug with guidance from the Iceberg community
• I cannot contribute a fix for this bug at this time