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[SPARK-48410][SQL] Fix InitCap expression for UTF8_BINARY_LCASE & ICU collations #46732

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[SPARK-48410][SQL] Fix InitCap expression for UTF8_BINARY_LCASE & ICU collations #46732

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4e0fcca
Initial commit
uros-db May 24, 2024
3c58f82
Update tests
uros-db May 24, 2024
05972b6
More tests for word boundaries
uros-db May 24, 2024
2f7db12
More tests for titlecase characters
uros-db May 24, 2024
8c14f50
More tests for case mapping
uros-db May 24, 2024
41962e4
Fix Java lint
uros-db May 24, 2024
ec4b045
Merge branch 'apache:master' into initcap-icu
uros-db May 28, 2024
7691b87
Small fixes
uros-db Jun 5, 2024
17c953a
Merge branch 'master' into initcap-icu
uros-db Jun 7, 2024
18427e7
Fix tests
uros-db Jun 7, 2024
39285ba
Fix lint
uros-db Jun 7, 2024
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18 changes: 18 additions & 0 deletions common/unsafe/src/main/java/org/apache/spark/sql/catalyst/util/CollationAwareUTF8String.java
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Original file line number Diff line number Diff line change
Expand Up @@ -386,6 +386,24 @@ public static String lowerCaseCodePoints(final String target) {
return sb.toString();
}

/**
* Convert the input string to titlecase using the ICU root locale rules.
*/
public static UTF8String toTitleCase(final UTF8String target) {
return UTF8String.fromString(toTitleCase(target.toString()));
}

public static String toTitleCase(final String target) {
return UCharacter.toTitleCase(target, BreakIterator.getWordInstance());
}

/**
* Convert the input string to titlecase using the specified ICU collation rules.
*/
public static UTF8String toTitleCase(final UTF8String target, final int collationId) {
return UTF8String.fromString(toTitleCase(target.toString(), collationId));
}

public static String toTitleCase(final String target, final int collationId) {
ULocale locale = CollationFactory.fetchCollation(collationId)
.collator.getLocale(ULocale.ACTUAL_LOCALE);
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27 changes: 13 additions & 14 deletions common/unsafe/src/main/java/org/apache/spark/sql/catalyst/util/CollationSupport.java
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Expand Up @@ -260,8 +260,10 @@ public static UTF8String execICU(final UTF8String v, final int collationId) {
public static class InitCap {
public static UTF8String exec(final UTF8String v, final int collationId) {
CollationFactory.Collation collation = CollationFactory.fetchCollation(collationId);
if (collation.supportsBinaryEquality || collation.supportsLowercaseEquality) {
return execUTF8(v);
if (collation.supportsBinaryEquality) {
return execBinary(v);
} else if (collation.supportsLowercaseEquality) {
return execLowercase(v);
} else {
return execICU(v, collationId);
}
Expand All @@ -270,25 +272,22 @@ public static UTF8String exec(final UTF8String v, final int collationId) {
public static String genCode(final String v, final int collationId) {
CollationFactory.Collation collation = CollationFactory.fetchCollation(collationId);
String expr = "CollationSupport.InitCap.exec";
if (collation.supportsBinaryEquality || collation.supportsLowercaseEquality) {
return String.format(expr + "UTF8(%s)", v);
if (collation.supportsBinaryEquality) {
return String.format(expr + "Binary(%s)", v);
} else if (collation.supportsLowercaseEquality) {
return String.format(expr + "Lowercase(%s)", v);
} else {
return String.format(expr + "ICU(%s, %d)", v, collationId);
}
}

public static UTF8String execUTF8(final UTF8String v) {
public static UTF8String execBinary(final UTF8String v) {
return v.toLowerCase().toTitleCase();
}

public static UTF8String execLowercase(final UTF8String v) {
return CollationAwareUTF8String.toTitleCase(v);
}
public static UTF8String execICU(final UTF8String v, final int collationId) {
return UTF8String.fromString(
CollationAwareUTF8String.toTitleCase(
CollationAwareUTF8String.toLowerCase(
v.toString(),
collationId
),
collationId));
return CollationAwareUTF8String.toTitleCase(v, collationId);
}
}

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46 changes: 42 additions & 4 deletions common/unsafe/src/test/java/org/apache/spark/unsafe/types/CollationSupportSuite.java
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Expand Up @@ -745,10 +745,48 @@ public void testInitCap() throws SparkException {
assertInitCap("aB 世 de", "UNICODE_CI", "Ab 世 De");
assertInitCap("ÄBĆΔE", "UNICODE_CI", "Äbćδe");
// Case-variable character length
assertInitCap("İo", "UTF8_BINARY", "İo");
assertInitCap("İo", "UTF8_BINARY_LCASE", "İo");
assertInitCap("İo", "UNICODE", "İo");
assertInitCap("İo", "UNICODE_CI", "İo");
assertInitCap("İo", "UTF8_BINARY", "I\u0307o");
assertInitCap("İo", "UTF8_BINARY_LCASE", "İo");
assertInitCap("İo", "UNICODE", "İo");
assertInitCap("İo", "UNICODE_CI", "İo");
assertInitCap("i\u0307o", "UTF8_BINARY", "I\u0307o");
assertInitCap("i\u0307o", "UTF8_BINARY_LCASE", "I\u0307o");
assertInitCap("i\u0307o", "UNICODE", "I\u0307o");
assertInitCap("i\u0307o", "UNICODE_CI", "I\u0307o");
// Different possible word boundaries
assertInitCap("a b c", "UTF8_BINARY", "A B C");
assertInitCap("a b c", "UNICODE", "A B C");
assertInitCap("a b c", "UTF8_BINARY_LCASE", "A B C");
assertInitCap("a b c", "UNICODE_CI", "A B C");
assertInitCap("a.b,c", "UTF8_BINARY", "A.b,c");
assertInitCap("a.b,c", "UNICODE", "A.b,C");
assertInitCap("a.b,c", "UTF8_BINARY_LCASE", "A.b,C");
assertInitCap("a.b,c", "UNICODE_CI", "A.b,C");
assertInitCap("a. b-c", "UTF8_BINARY", "A. B-c");
assertInitCap("a. b-c", "UNICODE", "A. B-C");
assertInitCap("a. b-c", "UTF8_BINARY_LCASE", "A. B-C");
assertInitCap("a. b-c", "UNICODE_CI", "A. B-C");
assertInitCap("a?b世c", "UTF8_BINARY", "A?b世c");
assertInitCap("a?b世c", "UNICODE", "A?B世C");
assertInitCap("a?b世c", "UTF8_BINARY_LCASE", "A?B世C");
assertInitCap("a?b世c", "UNICODE_CI", "A?B世C");
// Titlecase characters that are different from uppercase characters
assertInitCap("dzDZDz", "UTF8_BINARY", "Dzdzdz");
assertInitCap("dzDZDz", "UNICODE", "Dzdzdz");
assertInitCap("dzDZDz", "UTF8_BINARY_LCASE", "Dzdzdz");
assertInitCap("dzDZDz", "UNICODE_CI", "Dzdzdz");
assertInitCap("džaba Ljubav NJegova", "UTF8_BINARY", "Džaba Ljubav Njegova");
assertInitCap("džaba Ljubav NJegova", "UNICODE", "Džaba Ljubav Njegova");
assertInitCap("džaba Ljubav NJegova", "UTF8_BINARY_LCASE", "Džaba Ljubav Njegova");
assertInitCap("džaba Ljubav NJegova", "UNICODE_CI", "Džaba Ljubav Njegova");
assertInitCap("ß fi ffi ff st ΣΗΜΕΡΙΝΟΣ ΑΣΗΜΕΝΙΟΣ İOTA", "UTF8_BINARY",
"ß fi ffi ff st Σημερινος Ασημενιος I\u0307ota");
assertInitCap("ß fi ffi ff st ΣΗΜΕΡΙΝΟΣ ΑΣΗΜΕΝΙΟΣ İOTA", "UTF8_BINARY_LCASE",
"Ss Fi Ffi Ff St Σημερινος Ασημενιος İota");
assertInitCap("ß fi ffi ff st ΣΗΜΕΡΙΝΟΣ ΑΣΗΜΕΝΙΟΣ İOTA", "UNICODE",
"Ss Fi Ffi Ff St Σημερινος Ασημενιος İota");
assertInitCap("ß fi ffi ff st ΣΗΜΕΡΙΝΟΣ ΑΣΗΜΕΝΙΟΣ İOTA", "UNICODE_CI",
"Ss Fi Ffi Ff St Σημερινος Ασημενιος İota");
}

private void assertStringInstr(String string, String substring, String collationName,
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