[SPARK-48281][SQL] Alter string search logic for UTF8_BINARY_LCASE collation (StringInStr, SubstringIndex) #46589
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uros-db
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mkaravel
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May 16, 2024
common/unsafe/src/main/java/org/apache/spark/sql/catalyst/util/CollationAwareUTF8String.java
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common/unsafe/src/test/java/org/apache/spark/unsafe/types/CollationSupportSuite.java
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mkaravel
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May 20, 2024
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Please update the PR description. |
uros-db
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uros-db
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May 21, 2024
dbatomic
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May 28, 2024
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please fix merge conflicts. |
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thanks, merging to master! |
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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:
instr("İ", "i"); now returns 0, 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
instrandsubstring_indexexpressions is changed for edge cases with one-to-many case mapping.How was this patch tested?
New unit tests in
CollationSupportSuite.Was this patch authored or co-authored using generative AI tooling?
No.