cloud-fan commented on code in PR #45290:
URL: https://github.com/apache/spark/pull/45290#discussion_r1506223036
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sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/UnsafeRow.java:
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@@ -95,6 +96,20 @@ public static boolean isMutable(DataType dt) {
pdt instanceof PhysicalCalendarIntervalType;
}
+ /**
+ * True if comparisons, equality and hashing can be done purely on binary
representation of
+ * Unsafe row. i.e. binary(e1) = binary(e2) <=> e1 = e2.
+ * e.g. this is not true for non-binary collations (any case/accent
insensitive collation
+ * can lead to rows being semantically equal even though their binary
representations differ).
+ */
+ public static boolean isBinaryStable(DataType dt) {
+ if (dt instanceof StringType st) {
Review Comment:
shall we check nested field/array elements recursively?
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