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https://issues.apache.org/jira/browse/DRILL-8094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17467120#comment-17467120
]
ASF GitHub Bot commented on DRILL-8094:
---------------------------------------
Leon-WTF commented on a change in pull request #2416:
URL: https://github.com/apache/drill/pull/2416#discussion_r776938643
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/expr/fn/impl/StringFunctions.java
##########
@@ -416,16 +417,25 @@ public void setup() {
@Override
public void eval() {
- if (index.value < 1) {
+ if (index.value == 0) {
throw org.apache.drill.common.exceptions.UserException.functionError()
- .message("Index in split_part must be positive, value provided was "
- + index.value).build();
+ .message("Index in split_part can not be zero").build();
}
String inputString = org.apache.drill.exec.expr.fn.impl.
StringFunctionHelpers.getStringFromVarCharHolder(in);
- int arrayIndex = index.value - 1;
- String result =
- (String)
com.google.common.collect.Iterables.get(splitter.split(inputString),
arrayIndex, "");
+ String result = "";
+ if (index.value < 0) {
+ java.util.List<String> splits = splitter.splitToList(inputString);
+ int size = splits.size();
+ int arrayIndex = size + index.value;
+ if (arrayIndex >= 0) {
Review comment:
> What happens when arrayIndex < 0 here? An informative error would be
better than uninitialised result data
I think arrayIndex < 0 is not an error, it will return the empty string, see
the case below in UT.
testBuilder()
.sqlQuery("select split_part('a,b,c', ',', -4) res1 from (values(1))")
.ordered()
.baselineColumns("res1")
.baselineValues("")
.go();
Same as:
testBuilder()
.sqlQuery("select split_part('a,b,c', ',', 4) res1 from (values(1))")
.ordered()
.baselineColumns("res1")
.baselineValues("")
.go();
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> Support reverse truncation for split_part udf
> ---------------------------------------------
>
> Key: DRILL-8094
> URL: https://issues.apache.org/jira/browse/DRILL-8094
> Project: Apache Drill
> Issue Type: Improvement
> Reporter: wtf
> Priority: Minor
>
> suport split_part('a,b,c,d', ',' , -2, -1) = 'c,d' and split_part('a,b,c,d',
> ',' , -3) = 'b'
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