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new 12a507464f10 [SPARK-47566][SQL] Support SubstringIndex function to
work with collated strings
12a507464f10 is described below
commit 12a507464f106d299511d16c2a436cbc0257bc8a
Author: Milan Dankovic <milan.danko...@databricks.com>
AuthorDate: Tue Apr 30 17:19:01 2024 +0800
[SPARK-47566][SQL] Support SubstringIndex function to work with collated
strings
### What changes were proposed in this pull request?
Extend built-in string functions to support non-binary, non-lowercase
collation for: substring_index.
### Why are the changes needed?
Update collation support for built-in string functions in Spark.
### Does this PR introduce _any_ user-facing change?
Yes, users should now be able to use COLLATE within arguments for built-in
string function SUBSTRING_INDEX in Spark SQL queries, using non-binary
collations such as UNICODE_CI.
### How was this patch tested?
Unit tests for queries using SubstringIndex
(`CollationStringExpressionsSuite.scala`).
### Was this patch authored or co-authored using generative AI tooling?
No
### To consider:
There is no check for collation match between string and delimiter, it will
be introduced with Implicit Casting.
We can remove the original `public UTF8String subStringIndex(UTF8String
delim, int count)` method, and get the existing behavior using
`subStringIndex(delim, count, 0)`.
Closes #45725 from miland-db/miland-db/substringIndex-stringLocate.
Authored-by: Milan Dankovic <milan.danko...@databricks.com>
Signed-off-by: Wenchen Fan <wenc...@databricks.com>
---
.../spark/sql/catalyst/util/CollationSupport.java | 169 +++++++++++++++++++++
.../org/apache/spark/unsafe/types/UTF8String.java | 28 +++-
.../spark/unsafe/types/CollationSupportSuite.java | 83 ++++++++++
.../sql/catalyst/analysis/CollationTypeCasts.scala | 5 +
.../catalyst/expressions/stringExpressions.scala | 15 +-
.../sql/CollationStringExpressionsSuite.scala | 31 ++++
6 files changed, 323 insertions(+), 8 deletions(-)
diff --git
a/common/unsafe/src/main/java/org/apache/spark/sql/catalyst/util/CollationSupport.java
b/common/unsafe/src/main/java/org/apache/spark/sql/catalyst/util/CollationSupport.java
index 0c81b99de916..9778ca31209e 100644
---
a/common/unsafe/src/main/java/org/apache/spark/sql/catalyst/util/CollationSupport.java
+++
b/common/unsafe/src/main/java/org/apache/spark/sql/catalyst/util/CollationSupport.java
@@ -28,6 +28,9 @@ import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;
+import static org.apache.spark.unsafe.Platform.BYTE_ARRAY_OFFSET;
+import static org.apache.spark.unsafe.Platform.copyMemory;
+
/**
* Static entry point for collation-aware expressions (StringExpressions,
RegexpExpressions, and
* other expressions that require custom collation support), as well as
private utility methods for
@@ -441,6 +444,45 @@ public final class CollationSupport {
}
}
+ public static class SubstringIndex {
+ public static UTF8String exec(final UTF8String string, final UTF8String
delimiter,
+ final int count, final int collationId) {
+ CollationFactory.Collation collation =
CollationFactory.fetchCollation(collationId);
+ if (collation.supportsBinaryEquality) {
+ return execBinary(string, delimiter, count);
+ } else if (collation.supportsLowercaseEquality) {
+ return execLowercase(string, delimiter, count);
+ } else {
+ return execICU(string, delimiter, count, collationId);
+ }
+ }
+ public static String genCode(final String string, final String delimiter,
+ final int count, final int collationId) {
+ CollationFactory.Collation collation =
CollationFactory.fetchCollation(collationId);
+ String expr = "CollationSupport.SubstringIndex.exec";
+ if (collation.supportsBinaryEquality) {
+ return String.format(expr + "Binary(%s, %s, %d)", string, delimiter,
count);
+ } else if (collation.supportsLowercaseEquality) {
+ return String.format(expr + "Lowercase(%s, %s, %d)", string,
delimiter, count);
+ } else {
+ return String.format(expr + "ICU(%s, %s, %d, %d)", string, delimiter,
count, collationId);
+ }
+ }
+ public static UTF8String execBinary(final UTF8String string, final
UTF8String delimiter,
+ final int count) {
+ return string.subStringIndex(delimiter, count);
+ }
+ public static UTF8String execLowercase(final UTF8String string, final
UTF8String delimiter,
+ final int count) {
+ return CollationAwareUTF8String.lowercaseSubStringIndex(string,
delimiter, count);
+ }
+ public static UTF8String execICU(final UTF8String string, final UTF8String
delimiter,
+ final int count, final int collationId) {
+ return CollationAwareUTF8String.subStringIndex(string, delimiter, count,
+ collationId);
+ }
+ }
+
// TODO: Add more collation-aware string expressions.
/**
@@ -639,6 +681,133 @@ public final class CollationSupport {
return stringSearch.next();
}
+ private static int find(UTF8String target, UTF8String pattern, int start,
+ int collationId) {
+ assert (pattern.numBytes() > 0);
+
+ StringSearch stringSearch = CollationFactory.getStringSearch(target,
pattern, collationId);
+ // Set search start position (start from character at start position)
+ stringSearch.setIndex(target.bytePosToChar(start));
+
+ // Return either the byte position or -1 if not found
+ return target.charPosToByte(stringSearch.next());
+ }
+
+ private static UTF8String subStringIndex(final UTF8String string, final
UTF8String delimiter,
+ int count, final int collationId) {
+ if (delimiter.numBytes() == 0 || count == 0 || string.numBytes() == 0) {
+ return UTF8String.EMPTY_UTF8;
+ }
+ if (count > 0) {
+ int idx = -1;
+ while (count > 0) {
+ idx = find(string, delimiter, idx + 1, collationId);
+ if (idx >= 0) {
+ count --;
+ } else {
+ // can not find enough delim
+ return string;
+ }
+ }
+ if (idx == 0) {
+ return UTF8String.EMPTY_UTF8;
+ }
+ byte[] bytes = new byte[idx];
+ copyMemory(string.getBaseObject(), string.getBaseOffset(), bytes,
BYTE_ARRAY_OFFSET, idx);
+ return UTF8String.fromBytes(bytes);
+
+ } else {
+ count = -count;
+
+ StringSearch stringSearch = CollationFactory
+ .getStringSearch(string, delimiter, collationId);
+
+ int start = string.numChars() - 1;
+ int lastMatchLength = 0;
+ int prevStart = -1;
+ while (count > 0) {
+ stringSearch.reset();
+ prevStart = -1;
+ int matchStart = stringSearch.next();
+ lastMatchLength = stringSearch.getMatchLength();
+ while (matchStart <= start) {
+ if (matchStart != StringSearch.DONE) {
+ // Found a match, update the start position
+ prevStart = matchStart;
+ matchStart = stringSearch.next();
+ } else {
+ break;
+ }
+ }
+
+ if (prevStart == -1) {
+ // can not find enough delim
+ return string;
+ } else {
+ start = prevStart - 1;
+ count--;
+ }
+ }
+
+ int resultStart = prevStart + lastMatchLength;
+ if (resultStart == string.numChars()) {
+ return UTF8String.EMPTY_UTF8;
+ }
+
+ return string.substring(resultStart, string.numChars());
+ }
+ }
+
+ private static UTF8String lowercaseSubStringIndex(final UTF8String string,
+ final UTF8String delimiter, int count) {
+ if (delimiter.numBytes() == 0 || count == 0) {
+ return UTF8String.EMPTY_UTF8;
+ }
+
+ UTF8String lowercaseString = string.toLowerCase();
+ UTF8String lowercaseDelimiter = delimiter.toLowerCase();
+
+ if (count > 0) {
+ int idx = -1;
+ while (count > 0) {
+ idx = lowercaseString.find(lowercaseDelimiter, idx + 1);
+ if (idx >= 0) {
+ count --;
+ } else {
+ // can not find enough delim
+ return string;
+ }
+ }
+ if (idx == 0) {
+ return UTF8String.EMPTY_UTF8;
+ }
+ byte[] bytes = new byte[idx];
+ copyMemory(string.getBaseObject(), string.getBaseOffset(), bytes,
BYTE_ARRAY_OFFSET, idx);
+ return UTF8String.fromBytes(bytes);
+
+ } else {
+ int idx = string.numBytes() - delimiter.numBytes() + 1;
+ count = -count;
+ while (count > 0) {
+ idx = lowercaseString.rfind(lowercaseDelimiter, idx - 1);
+ if (idx >= 0) {
+ count --;
+ } else {
+ // can not find enough delim
+ return string;
+ }
+ }
+ if (idx + delimiter.numBytes() == string.numBytes()) {
+ return UTF8String.EMPTY_UTF8;
+ }
+ int size = string.numBytes() - delimiter.numBytes() - idx;
+ byte[] bytes = new byte[size];
+ copyMemory(string.getBaseObject(), string.getBaseOffset() + idx +
delimiter.numBytes(),
+ bytes, BYTE_ARRAY_OFFSET, size);
+ return UTF8String.fromBytes(bytes);
+ }
+ }
+
}
}
diff --git
a/common/unsafe/src/main/java/org/apache/spark/unsafe/types/UTF8String.java
b/common/unsafe/src/main/java/org/apache/spark/unsafe/types/UTF8String.java
index ca6198df2bbf..2a5d14580353 100644
--- a/common/unsafe/src/main/java/org/apache/spark/unsafe/types/UTF8String.java
+++ b/common/unsafe/src/main/java/org/apache/spark/unsafe/types/UTF8String.java
@@ -926,10 +926,34 @@ public final class UTF8String implements
Comparable<UTF8String>, Externalizable,
return -1;
}
+ public int charPosToByte(int charPos) {
+ if (charPos < 0) {
+ return -1;
+ }
+
+ int i = 0;
+ int c = 0;
+ while (i < numBytes && c < charPos) {
+ i += numBytesForFirstByte(getByte(i));
+ c += 1;
+ }
+ return i;
+ }
+
+ public int bytePosToChar(int bytePos) {
+ int i = 0;
+ int c = 0;
+ while (i < numBytes && i < bytePos) {
+ i += numBytesForFirstByte(getByte(i));
+ c += 1;
+ }
+ return c;
+ }
+
/**
* Find the `str` from left to right.
*/
- private int find(UTF8String str, int start) {
+ public int find(UTF8String str, int start) {
assert (str.numBytes > 0);
while (start <= numBytes - str.numBytes) {
if (ByteArrayMethods.arrayEquals(base, offset + start, str.base,
str.offset, str.numBytes)) {
@@ -943,7 +967,7 @@ public final class UTF8String implements
Comparable<UTF8String>, Externalizable,
/**
* Find the `str` from right to left.
*/
- private int rfind(UTF8String str, int start) {
+ public int rfind(UTF8String str, int start) {
assert (str.numBytes > 0);
while (start >= 0) {
if (ByteArrayMethods.arrayEquals(base, offset + start, str.base,
str.offset, str.numBytes)) {
diff --git
a/common/unsafe/src/test/java/org/apache/spark/unsafe/types/CollationSupportSuite.java
b/common/unsafe/src/test/java/org/apache/spark/unsafe/types/CollationSupportSuite.java
index 030c7a7a1e3c..2f05b9ad88c9 100644
---
a/common/unsafe/src/test/java/org/apache/spark/unsafe/types/CollationSupportSuite.java
+++
b/common/unsafe/src/test/java/org/apache/spark/unsafe/types/CollationSupportSuite.java
@@ -717,6 +717,89 @@ public class CollationSupportSuite {
assertLocate("İo", "世界i̇o大千世界大千i̇o", 4, "UNICODE_CI", 12); // 12 instead
of 11
}
+ private void assertSubstringIndex(String string, String delimiter, Integer
count,
+ String collationName, String expected) throws SparkException {
+ UTF8String str = UTF8String.fromString(string);
+ UTF8String delim = UTF8String.fromString(delimiter);
+ int collationId = CollationFactory.collationNameToId(collationName);
+ assertEquals(expected,
+ CollationSupport.SubstringIndex.exec(str, delim, count,
collationId).toString());
+ }
+
+ @Test
+ public void testSubstringIndex() throws SparkException {
+ assertSubstringIndex("wwwgapachegorg", "g", -3, "UTF8_BINARY",
"apachegorg");
+ assertSubstringIndex("www||apache||org", "||", 2, "UTF8_BINARY",
"www||apache");
+ assertSubstringIndex("aaaaaaaaaa", "aa", 2, "UTF8_BINARY", "a");
+ assertSubstringIndex("AaAaAaAaAa", "aa", 2, "UTF8_BINARY_LCASE", "A");
+ assertSubstringIndex("www.apache.org", ".", 3, "UTF8_BINARY_LCASE",
"www.apache.org");
+ assertSubstringIndex("wwwXapacheXorg", "x", 2, "UTF8_BINARY_LCASE",
"wwwXapache");
+ assertSubstringIndex("wwwxapachexorg", "X", 1, "UTF8_BINARY_LCASE", "www");
+ assertSubstringIndex("www.apache.org", ".", 0, "UTF8_BINARY_LCASE", "");
+ assertSubstringIndex("www.apache.ORG", ".", -3, "UTF8_BINARY_LCASE",
"www.apache.ORG");
+ assertSubstringIndex("wwwGapacheGorg", "g", 1, "UTF8_BINARY_LCASE", "www");
+ assertSubstringIndex("wwwGapacheGorg", "g", 3, "UTF8_BINARY_LCASE",
"wwwGapacheGor");
+ assertSubstringIndex("gwwwGapacheGorg", "g", 3, "UTF8_BINARY_LCASE",
"gwwwGapache");
+ assertSubstringIndex("wwwGapacheGorg", "g", -3, "UTF8_BINARY_LCASE",
"apacheGorg");
+ assertSubstringIndex("wwwmapacheMorg", "M", -2, "UTF8_BINARY_LCASE",
"apacheMorg");
+ assertSubstringIndex("www.apache.org", ".", -1, "UTF8_BINARY_LCASE",
"org");
+ assertSubstringIndex("www.apache.org.", ".", -1, "UTF8_BINARY_LCASE", "");
+ assertSubstringIndex("", ".", -2, "UTF8_BINARY_LCASE", "");
+ assertSubstringIndex("test大千世界X大千世界", "x", -1, "UTF8_BINARY_LCASE",
"大千世界");
+ assertSubstringIndex("test大千世界X大千世界", "X", 1, "UTF8_BINARY_LCASE",
"test大千世界");
+ assertSubstringIndex("test大千世界大千世界", "千", 2, "UTF8_BINARY_LCASE",
"test大千世界大");
+ assertSubstringIndex("www||APACHE||org", "||", 2, "UTF8_BINARY_LCASE",
"www||APACHE");
+ assertSubstringIndex("www||APACHE||org", "||", -1, "UTF8_BINARY_LCASE",
"org");
+ assertSubstringIndex("AaAaAaAaAa", "Aa", 2, "UNICODE", "Aa");
+ assertSubstringIndex("wwwYapacheyorg", "y", 3, "UNICODE",
"wwwYapacheyorg");
+ assertSubstringIndex("www.apache.org", ".", 2, "UNICODE", "www.apache");
+ assertSubstringIndex("wwwYapacheYorg", "Y", 1, "UNICODE", "www");
+ assertSubstringIndex("wwwYapacheYorg", "y", 1, "UNICODE",
"wwwYapacheYorg");
+ assertSubstringIndex("wwwGapacheGorg", "g", 1, "UNICODE", "wwwGapacheGor");
+ assertSubstringIndex("GwwwGapacheGorG", "G", 3, "UNICODE", "GwwwGapache");
+ assertSubstringIndex("wwwGapacheGorG", "G", -3, "UNICODE", "apacheGorG");
+ assertSubstringIndex("www.apache.org", ".", 0, "UNICODE", "");
+ assertSubstringIndex("www.apache.org", ".", -3, "UNICODE",
"www.apache.org");
+ assertSubstringIndex("www.apache.org", ".", -2, "UNICODE", "apache.org");
+ assertSubstringIndex("www.apache.org", ".", -1, "UNICODE", "org");
+ assertSubstringIndex("", ".", -2, "UNICODE", "");
+ assertSubstringIndex("test大千世界X大千世界", "X", -1, "UNICODE", "大千世界");
+ assertSubstringIndex("test大千世界X大千世界", "X", 1, "UNICODE", "test大千世界");
+ assertSubstringIndex("大x千世界大千世x界", "x", 1, "UNICODE", "大");
+ assertSubstringIndex("大x千世界大千世x界", "x", -1, "UNICODE", "界");
+ assertSubstringIndex("大x千世界大千世x界", "x", -2, "UNICODE", "千世界大千世x界");
+ assertSubstringIndex("大千世界大千世界", "千", 2, "UNICODE", "大千世界大");
+ assertSubstringIndex("www||apache||org", "||", 2, "UNICODE",
"www||apache");
+ assertSubstringIndex("AaAaAaAaAa", "aa", 2, "UNICODE_CI", "A");
+ assertSubstringIndex("www.apache.org", ".", 3, "UNICODE_CI",
"www.apache.org");
+ assertSubstringIndex("wwwXapacheXorg", "x", 2, "UNICODE_CI", "wwwXapache");
+ assertSubstringIndex("wwwxapacheXorg", "X", 1, "UNICODE_CI", "www");
+ assertSubstringIndex("www.apache.org", ".", 0, "UNICODE_CI", "");
+ assertSubstringIndex("wwwGapacheGorg", "G", 3, "UNICODE_CI",
"wwwGapacheGor");
+ assertSubstringIndex("gwwwGapacheGorg", "g", 3, "UNICODE_CI",
"gwwwGapache");
+ assertSubstringIndex("gwwwGapacheGorg", "g", -3, "UNICODE_CI",
"apacheGorg");
+ assertSubstringIndex("www.apache.ORG", ".", -3, "UNICODE_CI",
"www.apache.ORG");
+ assertSubstringIndex("wwwmapacheMorg", "M", -2, "UNICODE_CI",
"apacheMorg");
+ assertSubstringIndex("www.apache.org", ".", -1, "UNICODE_CI", "org");
+ assertSubstringIndex("", ".", -2, "UNICODE_CI", "");
+ assertSubstringIndex("test大千世界X大千世界", "X", -1, "UNICODE_CI", "大千世界");
+ assertSubstringIndex("test大千世界X大千世界", "X", 1, "UNICODE_CI", "test大千世界");
+ assertSubstringIndex("test大千世界大千世界", "千", 2, "UNICODE_CI", "test大千世界大");
+ assertSubstringIndex("www||APACHE||org", "||", 2, "UNICODE_CI",
"www||APACHE");
+ assertSubstringIndex("abİo12", "i̇o", 1, "UNICODE_CI", "ab");
+ assertSubstringIndex("abİo12", "i̇o", -1, "UNICODE_CI", "12");
+ assertSubstringIndex("abi̇o12", "İo", 1, "UNICODE_CI", "ab");
+ assertSubstringIndex("abi̇o12", "İo", -1, "UNICODE_CI", "12");
+ assertSubstringIndex("ai̇bi̇o12", "İo", 1, "UNICODE_CI", "ai̇b");
+ assertSubstringIndex("ai̇bi̇o12i̇o", "İo", 2, "UNICODE_CI", "ai̇bi̇o12");
+ assertSubstringIndex("ai̇bi̇o12i̇o", "İo", -1, "UNICODE_CI", "");
+ assertSubstringIndex("ai̇bi̇o12i̇o", "İo", -2, "UNICODE_CI", "12i̇o");
+ assertSubstringIndex("ai̇bi̇oİo12İoi̇o", "İo", -4, "UNICODE_CI",
"İo12İoi̇o");
+ assertSubstringIndex("ai̇bi̇oİo12İoi̇o", "i̇o", -4, "UNICODE_CI",
"İo12İoi̇o");
+ assertSubstringIndex("ai̇bİoi̇o12i̇oİo", "İo", -4, "UNICODE_CI",
"i̇o12i̇oİo");
+ assertSubstringIndex("ai̇bİoi̇o12i̇oİo", "i̇o", -4, "UNICODE_CI",
"i̇o12i̇oİo");
+ }
+
// TODO: Test more collation-aware string expressions.
/**
diff --git
a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CollationTypeCasts.scala
b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CollationTypeCasts.scala
index f69218812d36..1130677d5f1b 100644
---
a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CollationTypeCasts.scala
+++
b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CollationTypeCasts.scala
@@ -49,6 +49,11 @@ object CollationTypeCasts extends TypeCoercionRule {
stringLocate.withNewChildren(collateToSingleType(
Seq(stringLocate.first, stringLocate.second)) :+ stringLocate.third)
+ case substringIndex: SubstringIndex =>
+ substringIndex.withNewChildren(
+ collateToSingleType(
+ Seq(substringIndex.first, substringIndex.second)) :+
substringIndex.third)
+
case eltExpr: Elt =>
eltExpr.withNewChildren(eltExpr.children.head +:
collateToSingleType(eltExpr.children.tail))
diff --git
a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
index 2d7f9652986a..b0352046b920 100755
---
a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
+++
b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
@@ -1406,21 +1406,24 @@ case class StringInstr(str: Expression, substr:
Expression)
case class SubstringIndex(strExpr: Expression, delimExpr: Expression,
countExpr: Expression)
extends TernaryExpression with ImplicitCastInputTypes with NullIntolerant {
- override def dataType: DataType = StringType
- override def inputTypes: Seq[DataType] = Seq(StringType, StringType,
IntegerType)
+ final lazy val collationId: Int =
first.dataType.asInstanceOf[StringType].collationId
+
+ override def dataType: DataType = strExpr.dataType
+ override def inputTypes: Seq[AbstractDataType] =
+ Seq(StringTypeAnyCollation, StringTypeAnyCollation, IntegerType)
override def first: Expression = strExpr
override def second: Expression = delimExpr
override def third: Expression = countExpr
override def prettyName: String = "substring_index"
override def nullSafeEval(str: Any, delim: Any, count: Any): Any = {
- str.asInstanceOf[UTF8String].subStringIndex(
- delim.asInstanceOf[UTF8String],
- count.asInstanceOf[Int])
+ CollationSupport.SubstringIndex.exec(str.asInstanceOf[UTF8String],
+ delim.asInstanceOf[UTF8String], count.asInstanceOf[Int], collationId);
}
override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
- defineCodeGen(ctx, ev, (str, delim, count) =>
s"$str.subStringIndex($delim, $count)")
+ defineCodeGen(ctx, ev, (str, delim, count) =>
+ CollationSupport.SubstringIndex.genCode(str, delim,
Integer.parseInt(count, 10), collationId))
}
override protected def withNewChildrenInternal(
diff --git
a/sql/core/src/test/scala/org/apache/spark/sql/CollationStringExpressionsSuite.scala
b/sql/core/src/test/scala/org/apache/spark/sql/CollationStringExpressionsSuite.scala
index d88c15fb2325..989e418b7477 100644
---
a/sql/core/src/test/scala/org/apache/spark/sql/CollationStringExpressionsSuite.scala
+++
b/sql/core/src/test/scala/org/apache/spark/sql/CollationStringExpressionsSuite.scala
@@ -131,6 +131,37 @@ class CollationStringExpressionsSuite
assert(collationMismatch.getErrorClass === "COLLATION_MISMATCH.EXPLICIT")
}
+ test("Support SubstringIndex expression with collation") {
+ case class SubstringIndexTestCase[R](string: String, delimiter: String,
count: Integer,
+ c: String, result: R)
+ val testCases = Seq(
+ SubstringIndexTestCase("wwwgapachegorg", "g", -3, "UTF8_BINARY",
"apachegorg"),
+ SubstringIndexTestCase("www||apache||org", "||", 2, "UTF8_BINARY",
"www||apache"),
+ SubstringIndexTestCase("wwwXapacheXorg", "x", 2, "UTF8_BINARY_LCASE",
"wwwXapache"),
+ SubstringIndexTestCase("aaaaaaaaaa", "aa", 2, "UNICODE", "a"),
+ SubstringIndexTestCase("wwwmapacheMorg", "M", -2, "UNICODE_CI",
"apacheMorg")
+ )
+ testCases.foreach(t => {
+ val query = s"SELECT substring_index(collate('${t.string}','${t.c}')," +
+ s"collate('${t.delimiter}','${t.c}'),${t.count})"
+ // Result & data type
+ checkAnswer(sql(query), Row(t.result))
+ assert(sql(query).schema.fields.head.dataType.sameType(
+ StringType(CollationFactory.collationNameToId(t.c))))
+ // Implicit casting
+ checkAnswer(sql(s"SELECT
substring_index(collate('${t.string}','${t.c}')," +
+ s"'${t.delimiter}',${t.count})"), Row(t.result))
+ checkAnswer(sql(s"SELECT
substring_index('${t.string}',collate('${t.delimiter}','${t.c}')," +
+ s"${t.count})"), Row(t.result))
+ })
+ // Collation mismatch
+ val collationMismatch = intercept[AnalysisException] {
+ sql("SELECT substring_index(collate('abcde','UTF8_BINARY_LCASE')," +
+ "collate('C','UNICODE_CI'),1)")
+ }
+ assert(collationMismatch.getErrorClass === "COLLATION_MISMATCH.EXPLICIT")
+ }
+
test("Support StringInStr string expression with collation") {
case class StringInStrTestCase[R](string: String, substring: String, c:
String, result: R)
val testCases = Seq(
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