[SPARK-48282][SQL] Alter string search logic for UTF8_BINARY_LCASE collation (StringReplace, FindInSet) #46682
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uros-db
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Please remove the word "conditional" in the above section. |
mkaravel
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May 24, 2024
common/unsafe/src/main/java/org/apache/spark/sql/catalyst/util/CollationAwareUTF8String.java
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### What changes were proposed in this pull request? Renaming `UTF8_BINARY_LCASE` collation to `UTF8_LCASE`. ### Why are the changes needed? As part of the collation effort in Spark, we've moved away from byte-by-byte logic towards character-by-character logic, so what we used to call `UTF8_BINARY_LCASE` is now more precisely `UTF8_LCASE`. For example, string searching in UTF8_LCASE now works on character-level (rather than on byte-level), which is reflected in this PRs: #46511, #46589, #46682, #46761, #46762. In addition, string comparison also works on character-level now, as per the changes introduced in this PR: #46700. ### Does this PR introduce _any_ user-facing change? Yes, what was previously named `UTF8_BINARY_LCASE` collation, will from now on be named `UTF8_LCASE`. ### How was this patch tested? Existing tests. ### Was this patch authored or co-authored using generative AI tooling? No. Closes #46924 from uros-db/rename-lcase. Authored-by: Uros Bojanic <157381213+uros-db@users.noreply.github.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com>
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What changes were proposed in this pull request?
String searching in UTF8_BINARY_LCASE now works on character-level, rather than on byte-level. For example:
replace("İ", "i"); now returns "İ", because there exists nostart, lensuch thatlowercase(substring("İ", start, len)) == "i".Why are the changes needed?
Fix functions that give unusable results due to one-to-many case mapping when performing string search under UTF8_BINARY_LCASE (see example above).
Does this PR introduce any user-facing change?
Yes, behaviour of
replaceexpression is changed for edge cases with one-to-many case mapping.How was this patch tested?
New unit tests for StringReplace and FindInSet in
CollationSupportSuite.Was this patch authored or co-authored using generative AI tooling?
No.