morrySnow commented on code in PR #49087:
URL: https://github.com/apache/doris/pull/49087#discussion_r2000177596
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/executable/StringArithmetic.java:
##########
@@ -303,17 +308,19 @@ public static Expression left(StringLikeLiteral first,
IntegerLiteral second) {
*/
@ExecFunction(name = "right")
public static Expression right(StringLikeLiteral first, IntegerLiteral
second) {
- if (second.getValue() < (- first.getValue().length()) ||
Math.abs(second.getValue()) == 0) {
+ int inputLength = first.getValue().offsetByCodePoints(0,
first.getValue().length());
+ if (second.getValue() < (- inputLength) || Math.abs(second.getValue())
== 0) {
return castStringLikeLiteral(first, "");
- } else if (second.getValue() > first.getValue().length()) {
+ } else if (second.getValue() > inputLength) {
return first;
} else {
+ int index = first.getValue().offsetByCodePoints(0,
second.getValue());
Review Comment:
throw exception when `second.getValue < 0`. when `second.getValue < 0`
should call `int index = first.getValue().offsetByCodePoints(inputLength,
second.getValue());`
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/executable/StringArithmetic.java:
##########
Review Comment:
all offsetByCodePoints should be replaced by codePointCount
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/executable/StringArithmetic.java:
##########
@@ -303,17 +308,19 @@ public static Expression left(StringLikeLiteral first,
IntegerLiteral second) {
*/
@ExecFunction(name = "right")
public static Expression right(StringLikeLiteral first, IntegerLiteral
second) {
- if (second.getValue() < (- first.getValue().length()) ||
Math.abs(second.getValue()) == 0) {
+ int inputLength = first.getValue().offsetByCodePoints(0,
first.getValue().length());
Review Comment:
```suggestion
int inputLength = first.getValue().codePointCount(0,
first.getValue().length());
```
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/executable/StringArithmetic.java:
##########
Review Comment:
we'd better add FE UT too to ensure these functions work as expected rather
than throw exception
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/executable/StringArithmetic.java:
##########
@@ -659,6 +666,27 @@ public static Expression space(IntegerLiteral first) {
return new VarcharLiteral(sb.toString());
}
+ /**
+ * split by char by empty string considering emoji
+ * @param first input string to be split
+ * @return ArrayLiteral
+ */
+ public static Expression splitByGrapheme(StringLikeLiteral first) {
+ List<String> result = new ArrayList<>();
+ int length = first.getValue().length();
+ for (int i = 0; i < length; ) {
+ int codePoint = first.getValue().codePointAt(i);
+ int charCount = Character.charCount(codePoint);
+ result.add(first.getValue().substring(i, i + charCount));
+ i += charCount;
+ }
+ List<Literal> items = new ArrayList<>();
+ for (String s : result) {
+ items.add((Literal) castStringLikeLiteral(first, s));
+ }
Review Comment:
then remove this for loop
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/executable/StringArithmetic.java:
##########
@@ -289,12 +292,14 @@ public static Expression replace(StringLikeLiteral first,
StringLikeLiteral seco
*/
@ExecFunction(name = "left")
public static Expression left(StringLikeLiteral first, IntegerLiteral
second) {
+ int inputLength = first.getValue().offsetByCodePoints(0,
first.getValue().length());
if (second.getValue() <= 0) {
return castStringLikeLiteral(first, "");
- } else if (second.getValue() < first.getValue().length()) {
- return castStringLikeLiteral(first, first.getValue().substring(0,
second.getValue()));
- } else {
+ } else if (second.getValue() > inputLength) {
Review Comment:
```suggestion
} else if (second.getValue() >= inputLength) {
```
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/executable/StringArithmetic.java:
##########
@@ -659,6 +666,27 @@ public static Expression space(IntegerLiteral first) {
return new VarcharLiteral(sb.toString());
}
+ /**
+ * split by char by empty string considering emoji
+ * @param first input string to be split
+ * @return ArrayLiteral
+ */
+ public static Expression splitByGrapheme(StringLikeLiteral first) {
Review Comment:
```suggestion
public static Expression splitByGrapheme(StringLikeLiteral str) {
```
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/executable/StringArithmetic.java:
##########
@@ -303,17 +308,19 @@ public static Expression left(StringLikeLiteral first,
IntegerLiteral second) {
*/
@ExecFunction(name = "right")
public static Expression right(StringLikeLiteral first, IntegerLiteral
second) {
- if (second.getValue() < (- first.getValue().length()) ||
Math.abs(second.getValue()) == 0) {
+ int inputLength = first.getValue().offsetByCodePoints(0,
first.getValue().length());
+ if (second.getValue() < (- inputLength) || Math.abs(second.getValue())
== 0) {
return castStringLikeLiteral(first, "");
- } else if (second.getValue() > first.getValue().length()) {
+ } else if (second.getValue() > inputLength) {
Review Comment:
```suggestion
} else if (second.getValue() >= inputLength) {
```
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/executable/StringArithmetic.java:
##########
@@ -333,7 +340,7 @@ public static Expression locate(StringLikeLiteral first,
StringLikeLiteral secon
public static Expression locate(StringLikeLiteral first, StringLikeLiteral
second, IntegerLiteral third) {
int result = second.getValue().indexOf(first.getValue()) + 1;
if (third.getValue() <= 0 || !substringImpl(second.getValue(),
third.getValue(),
- second.getValue().length()).contains(first.getValue())) {
+ second.getValue().offsetByCodePoints(0,
second.getValue().length())).contains(first.getValue())) {
Review Comment:
add comment to explain which situation do you process when u call
`!substringImpl(second.getValue(), third.getValue(),
second.getValue().offsetByCodePoints(0,
second.getValue().length())).contains(first.getValue())`
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/executable/StringArithmetic.java:
##########
@@ -659,6 +666,27 @@ public static Expression space(IntegerLiteral first) {
return new VarcharLiteral(sb.toString());
}
+ /**
+ * split by char by empty string considering emoji
+ * @param first input string to be split
+ * @return ArrayLiteral
+ */
+ public static Expression splitByGrapheme(StringLikeLiteral first) {
+ List<String> result = new ArrayList<>();
Review Comment:
List<Literal> result =
Lists.newArrayListWithExpectedSize(first.getValue().length());
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/executable/StringArithmetic.java:
##########
@@ -659,6 +666,27 @@ public static Expression space(IntegerLiteral first) {
return new VarcharLiteral(sb.toString());
}
+ /**
+ * split by char by empty string considering emoji
+ * @param first input string to be split
+ * @return ArrayLiteral
+ */
+ public static Expression splitByGrapheme(StringLikeLiteral first) {
+ List<String> result = new ArrayList<>();
+ int length = first.getValue().length();
+ for (int i = 0; i < length; ) {
+ int codePoint = first.getValue().codePointAt(i);
+ int charCount = Character.charCount(codePoint);
+ result.add(first.getValue().substring(i, i + charCount));
Review Comment:
maybe a better way
```suggestion
result.add(castStringLikeLiteral(first, new String(new
int[]{codePoint}, 0, 1)));
```
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