[SPARK-48681][SQL] Use ICU in Lower/Upper expressions for UTF8_BINARY strings #47043
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common/unsafe/src/test/java/org/apache/spark/unsafe/types/CollationSupportSuite.java
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Please also update the PR description and explain why we are making this change. |
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### What changes were proposed in this pull request? Update `InitCap` Spark expressions to use ICU case mappings for UTF8_BINARY collation, instead of the currently used JVM case mappings. This behaviour is put under the `ICU_CASE_MAPPINGS_ENABLED` flag in SQLConf, which is true by default. Note: the same flag is used for `Lower` & `Upper` expressions, with changes introduced in: #47043. ### Why are the changes needed? To keep the consistency between collations - all collations shouls use ICU-based case mappings, including the UTF8_BINARY collation. ### Does this PR introduce _any_ user-facing change? Yes, the behaviour of `initcap` string function for UTF8_BINARY will now rely on ICU-based case mappings. However, by turning the `ICU_CASE_MAPPINGS_ENABLED` flag off, users can get the old JVM-based case mappings. Note that the difference between the two is really subtle. ### How was this patch tested? Existing tests, with extended `CollationSupport` unit tests for InitCap to verify both ICU and JVM behaviour. ### Was this patch authored or co-authored using generative AI tooling? No. Closes #47100 from uros-db/change-initcap. 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? Update `InitCap` Spark expressions to use ICU case mappings for UTF8_BINARY collation, instead of the currently used JVM case mappings. This behaviour is put under the `ICU_CASE_MAPPINGS_ENABLED` flag in SQLConf, which is true by default. Note: the same flag is used for `Lower` & `Upper` expressions, with changes introduced in: apache#47043. ### Why are the changes needed? To keep the consistency between collations - all collations shouls use ICU-based case mappings, including the UTF8_BINARY collation. ### Does this PR introduce _any_ user-facing change? Yes, the behaviour of `initcap` string function for UTF8_BINARY will now rely on ICU-based case mappings. However, by turning the `ICU_CASE_MAPPINGS_ENABLED` flag off, users can get the old JVM-based case mappings. Note that the difference between the two is really subtle. ### How was this patch tested? Existing tests, with extended `CollationSupport` unit tests for InitCap to verify both ICU and JVM behaviour. ### Was this patch authored or co-authored using generative AI tooling? No. Closes apache#47100 from uros-db/change-initcap. Authored-by: Uros Bojanic <157381213+uros-db@users.noreply.github.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com>
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… strings ### What changes were proposed in this pull request? Update `Lower` & `Upper` Spark expressions to use ICU case mappings for UTF8_BINARY collation, instead of the currently used JVM case mappings. This behaviour is put under the `ICU_CASE_MAPPINGS_ENABLED` flag in SQLConf, which is `true` by default. ### Why are the changes needed? To keep the consistency between collations - all collations shouls use ICU-based case mappings, including the UTF8_BINARY collation. ### Does this PR introduce _any_ user-facing change? Yes, the behaviour of `lower` & `upper` string functions for UTF8_BINARY will now rely on ICU-based case mappings. However, by turning the `ICU_CASE_MAPPINGS_ENABLED` flag off, users can get the old JVM-based case mappings. Note that the difference between the two is really subtle. ### How was this patch tested? Existing tests, with extended `CollationSupport` unit tests for Lower/Upper to verify both ICU and JVM behaviour. ### Was this patch authored or co-authored using generative AI tooling? No. Closes apache#47043 from uros-db/change-lower-upper. 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? Update `InitCap` Spark expressions to use ICU case mappings for UTF8_BINARY collation, instead of the currently used JVM case mappings. This behaviour is put under the `ICU_CASE_MAPPINGS_ENABLED` flag in SQLConf, which is true by default. Note: the same flag is used for `Lower` & `Upper` expressions, with changes introduced in: apache#47043. ### Why are the changes needed? To keep the consistency between collations - all collations shouls use ICU-based case mappings, including the UTF8_BINARY collation. ### Does this PR introduce _any_ user-facing change? Yes, the behaviour of `initcap` string function for UTF8_BINARY will now rely on ICU-based case mappings. However, by turning the `ICU_CASE_MAPPINGS_ENABLED` flag off, users can get the old JVM-based case mappings. Note that the difference between the two is really subtle. ### How was this patch tested? Existing tests, with extended `CollationSupport` unit tests for InitCap to verify both ICU and JVM behaviour. ### Was this patch authored or co-authored using generative AI tooling? No. Closes apache#47100 from uros-db/change-initcap. 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?
Update
Lower&UpperSpark expressions to use ICU case mappings for UTF8_BINARY collation, instead of the currently used JVM case mappings. This behaviour is put under theICU_CASE_MAPPINGS_ENABLEDflag in SQLConf, which istrueby default.Why are the changes needed?
To keep the consistency between collations - all collations shouls use ICU-based case mappings, including the UTF8_BINARY collation.
Does this PR introduce any user-facing change?
Yes, the behaviour of
lower&upperstring functions for UTF8_BINARY will now rely on ICU-based case mappings. However, by turning theICU_CASE_MAPPINGS_ENABLEDflag off, users can get the old JVM-based case mappings. Note that the difference between the two is really subtle.How was this patch tested?
Existing tests, with extended
CollationSupportunit tests for Lower/Upper to verify both ICU and JVM behaviour.Was this patch authored or co-authored using generative AI tooling?
No.