cryptoe opened a new pull request, #12552: URL: https://github.com/apache/druid/pull/12552
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See [the 'If your pull request shows conflicts with master' section](https://github.com/apache/druid/blob/master/CONTRIBUTING.md#if-your-pull-request-shows-conflicts-with-master) for more details. --> ### Description Fixes a bug when running q's like ```sql SELECT cntarray, Count(*) FROM (SELECT dim1, dim2, Array_agg(cnt) AS cntarray FROM (SELECT dim1, dim2, dim3, Count(*) AS cnt FROM foo GROUP BY 1, 2, 3) GROUP BY 1, 2) GROUP BY 1 ``` This generates an error: ``` org.apache.druid.java.util.common.ISE: Unable to convert type [Ljava.lang.Object; to org.apache.druid.segment.data.ComparableList at org.apache.druid.segment.DimensionHandlerUtils.convertToList(DimensionHandlerUtils.java:405) ~[druid-xx] ``` Because it's an array of numbers it looks like it does the `convertToList` call, which looks like: ``` java @Nullable public static ComparableList convertToList(Object obj) { if (obj == null) { return null; } if (obj instanceof List) { return new ComparableList((List) obj); } if (obj instanceof ComparableList) { return (ComparableList) obj; } throw new ISE("Unable to convert type %s to %s", obj.getClass().getName(), ComparableList.class.getName()); } ``` I.e. it doesn't know about arrays. Added the array handling as part of this PR. Also, there is another code path that knows about arrays. but that has a typo. ```java Objects[] objects = (Objects[]) obj; String[] delegate = new String[objects.length]; for (int i = 0; i < objects.length; i++) { delegate[i] = convertObjectToString(objects[i]); } return ComparableStringArray.of(delegate); ``` it should be `object[]` and not `objects[]`. Added test cases to handle this case along with the change. Thanks, @imply-cheddar for finding this bug. <!-- Replace XXXX with the id of the issue fixed in this PR. Remove this section if there is no corresponding issue. Don't reference the issue in the title of this pull-request. --> <!-- If you are a committer, follow the PR action item checklist for committers: https://github.com/apache/druid/blob/master/dev/committer-instructions.md#pr-and-issue-action-item-checklist-for-committers. --> <!-- Describe the goal of this PR, what problem are you fixing. 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If something hasn't changed since the original discussion, you can omit a detailed discussion of those aspects of the design here, perhaps apart from brief mentioning for the sake of readability of this PR description. --> <!-- Some of the aspects mentioned above may be omitted for simple and small changes. --> <hr> ##### Key changed/added classes in this PR * `processing/src/main/java/org/apache/druid/segment/DimensionHandlerUtils.java` * `sql/src/test/java/org/apache/druid/sql/calcite/CalciteArraysQueryTest.java` * `TheirBaz` <hr> <!-- Check the items by putting "x" in the brackets for the done things. Not all of these items apply to every PR. Remove the items which are not done or not relevant to the PR. 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Linked related entities via Javadoc links. - [ ] added or updated version, license, or notice information in [licenses.yaml](https://github.com/apache/druid/blob/master/dev/license.md) - [ ] added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader. - [ ] added unit tests or modified existing tests to cover new code paths, ensuring the threshold for [code coverage](https://github.com/apache/druid/blob/master/dev/code-review/code-coverage.md) is met. - [ ] added integration tests. - [ ] been tested in a test Druid cluster. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. 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