dbatomic commented on code in PR #45216:
URL: https://github.com/apache/spark/pull/45216#discussion_r1498988909
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common/unsafe/src/main/java/org/apache/spark/sql/catalyst/util/CollationFactory.java:
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@@ -66,6 +66,13 @@ public static class Collation {
*/
public final boolean isBinaryCollation;
+ /**
+ * Built-in string functions with collation support.
Review Comment:
Instead of adding new functions here I would propose following:
1) Add only low level basic functions here (e.g. matchAt).
2) Extend UTF8String with `public boolean startsWith(final UTF8String
prefix, *collationId*)`. Have all the routing happen there.
3) Short circuit if we have `DEFAULT_COLLATION_ID` to previous
implementation (e.g. (startsWith(final UTF8String prefix)). That way we will
not risk regressing previous version.
4) Have operators call startsWith/endsWith... with proper collationId.
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