lionants02 opened a new issue, #7263: URL: https://github.com/apache/hop/issues/7263
### Apache Hop version? 2.18.0 ### Java version? OpenJDK Runtime Environment (build 21.0.2+13-58) OpenJDK 64-Bit Server VM (build 21.0.2+13-58, mixed mode, sharing) ### Operating system Windows ### What happened? ### Description When running a pipeline in Apache Hop 2.18.0, the `Sorted merge` transform throws an `IndexOutOfBoundsException` if the preceding transform (`Sort rows`) is configured to run with multiple copies (e.g., `x8`). The internal array or list managing the incoming rowsets (`inputRowSets`) does not seem to handle multiple incoming parallel streams properly during the first row retrieval phase (`getRowSortedFirstCall`), leading to a crash when trying to access index 7 when the list length is only 1. ### Environment - **Apache Hop version:** 2.18.0 - **Execution Engine:** Local Pipeline Engine - **Java Version:** OpenJDK Runtime Environment (build 21.0.2+13-58) OpenJDK 64-Bit Server VM (build 21.0.2+13-58, mixed mode, sharing) - **OS:** Windows11 ### Steps to Reproduce 1. Create a pipeline with the following sequence: `Generate rows` -> `Cluset generate` -> `Sort rows` -> `Sorted merge`. 2. Configure `Generate rows`, `Cluset generate`, and `Sort rows` to run with **8 copies** (`x8`). 3. Keep the `Sorted merge` transform at the default **1 copy**. 4. Execute the pipeline using the Local Pipeline Engine. 5. The pipeline will immediately crash at the `Sorted merge` transform block. ### Expected Behavior The `Sorted merge` transform should dynamically discover and allocate row sets for all 8 incoming parallel streams from the previous `Sort rows` transform copies, then successfully merge them in sorted order without throwing an index bounds error. ### Actual Behavior The pipeline fails instantly with: `java.lang.IndexOutOfBoundsException: Index 7 out of bounds for length 1` at `org.apache.hop.pipeline.transforms.sortedmerge.SortedMerge.getRowSortedFirstCall(SortedMerge.java:145)` ### Screenshots <img width="1631" height="802" alt="Image" src="https://github.com/user-attachments/assets/2676cd0c-1aff-44cf-ace6-60ad487693e4"; /> ### Log Output ```text 2026/06/11 13:29:58 [Basic] Hop - Pipeline opened. 2026/06/11 13:29:58 [Basic] Hop - Launching pipeline [sortmerge]... 2026/06/11 13:29:58 [Basic] Hop - Started executing pipeline 'sortmerge'. 2026/06/11 13:29:58 [Basic] sortmerge - Executing this pipeline using the Local Pipeline Engine with run configuration 'local' 2026/06/11 13:29:58 [Basic] sortmerge - Execution started for pipeline [sortmerge] 2026/06/11 13:29:58 [Basic] Generate rows.1 - Finished processing (I=0, O=0, R=0, W=10000, U=0, E=0) 2026/06/11 13:29:58 [Basic] Generate rows.0 - Finished processing (I=0, O=0, R=0, W=10000, U=0, E=0) 2026/06/11 13:29:58 [Basic] Generate rows.2 - Finished processing (I=0, O=0, R=0, W=10000, U=0, E=0) 2026/06/11 13:29:58 [Basic] Generate rows.3 - Finished processing (I=0, O=0, R=0, W=10000, U=0, E=0) 2026/06/11 13:29:58 [Basic] Generate rows.5 - Finished processing (I=0, O=0, R=0, W=10000, U=0, E=0) 2026/06/11 13:29:58 [Basic] Generate rows.4 - Finished processing (I=0, O=0, R=0, W=10000, U=0, E=0) 2026/06/11 13:29:58 [Basic] Generate rows.6 - Finished processing (I=0, O=0, R=0, W=10000, U=0, E=0) 2026/06/11 13:29:58 [Basic] Generate rows.7 - Finished processing (I=0, O=0, R=0, W=10000, U=0, E=0) 2026/06/11 13:29:58 [Basic] Cluset generate.2 - Finished processing (I=0, O=0, R=10000, W=10000, U=0, E=0) 2026/06/11 13:29:58 [Basic] Cluset generate.3 - Finished processing (I=0, O=0, R=10000, W=10000, U=0, E=0) 2026/06/11 13:29:58 [Basic] Cluset generate.1 - Finished processing (I=0, O=0, R=10000, W=10000, U=0, E=0) 2026/06/11 13:29:58 [Basic] Cluset generate.0 - Finished processing (I=0, O=0, R=10000, W=10000, U=0, E=0) 2026/06/11 13:29:58 [Basic] Cluset generate.6 - Finished processing (I=0, O=0, R=10000, W=10000, U=0, E=0) 2026/06/11 13:29:58 [Basic] Cluset generate.4 - Finished processing (I=0, O=0, R=10000, W=10000, U=0, E=0) 2026/06/11 13:29:58 [Basic] Cluset generate.7 - Finished processing (I=0, O=0, R=10000, W=10000, U=0, E=0) 2026/06/11 13:29:58 [Basic] Cluset generate.5 - Finished processing (I=0, O=0, R=10000, W=10000, U=0, E=0) 2026/06/11 13:29:58 [Error] Sorted merge.0 - Unexpected error 2026/06/11 13:29:58 [Error] Sorted merge.0 - java.lang.IndexOutOfBoundsException: Index 7 out of bounds for length 1 2026/06/11 13:29:58 [Error] Sorted merge.0 - at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:100) 2026/06/11 13:29:58 [Error] Sorted merge.0 - at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:106) 2026/06/11 13:29:58 [Error] Sorted merge.0 - at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:302) 2026/06/11 13:29:58 [Error] Sorted merge.0 - at java.base/java.util.Objects.checkIndex(Objects.java:385) 2026/06/11 13:29:58 [Error] Sorted merge.0 - at java.base/java.util.ArrayList.get(ArrayList.java:427) 2026/06/11 13:29:58 [Error] Sorted merge.0 - at org.apache.hop.pipeline.transforms.sortedmerge.SortedMerge.getRowSortedFirstCall(SortedMerge.java:145) 2026/06/11 13:29:58 [Error] Sorted merge.0 - at org.apache.hop.pipeline.transforms.sortedmerge.SortedMerge.getRowSorted(SortedMerge.java:60) 2026/06/11 13:29:58 [Error] Sorted merge.0 - at org.apache.hop.pipeline.transforms.sortedmerge.SortedMerge.processRow(SortedMerge.java:180) 2026/06/11 13:29:58 [Error] Sorted merge.0 - at org.apache.hop.pipeline.transform.RunThread.run(RunThread.java:54) 2026/06/11 13:29:58 [Error] Sorted merge.0 - at java.base/java.lang.Thread.run(Thread.java:1583) 2026/06/11 13:29:58 [Basic] Hop - Stopped processing pipeline 'sortmerge'. 2026/06/11 13:29:58 [Basic] Sort rows.6 - Finished processing (I=0, O=0, R=10000, W=9904, U=0, E=0) 2026/06/11 13:29:58 [Basic] Sort rows.7 - Finished processing (I=0, O=0, R=10000, W=9906, U=0, E=0) 2026/06/11 13:29:58 [Basic] Sort rows.0 - Finished processing (I=0, O=0, R=10000, W=9901, U=0, E=0) 2026/06/11 13:29:58 [Basic] Sort rows.2 - Finished processing (I=0, O=0, R=10000, W=9917, U=0, E=0) 2026/06/11 13:29:58 [Basic] Sort rows.4 - Finished processing (I=0, O=0, R=10000, W=9904, U=0, E=0) 2026/06/11 13:29:58 [Basic] Sorted merge.0 - Finished processing (I=0, O=0, R=1, W=0, U=0, E=1) 2026/06/11 13:29:58 [Basic] Sort rows.5 - Finished processing (I=0, O=0, R=10000, W=0, U=0, E=0) 2026/06/11 13:29:58 [Basic] Sort rows.3 - Finished processing (I=0, O=0, R=10000, W=0, U=0, E=0) 2026/06/11 13:29:58 [Basic] Sort rows.1 - Finished processing (I=0, O=0, R=10000, W=0, U=0, E=0) 2026/06/11 13:29:58 [Minimal] sortmerge - Pipeline detected one or more transforms with errors. 2026/06/11 13:29:58 [Minimal] sortmerge - Pipeline is killing the other transforms! 2026/06/11 13:29:58 [Basic] sortmerge - Pipeline duration : 0.231 seconds [ 0.231" ] 2026/06/11 13:29:58 [Basic] Hop - Pipeline 'sortmerge' completed. 2026/06/11 13:29:58 [Basic] sortmerge - Execution finished on a local pipeline engine with run configuration 'local' ``` ### Issue Priority Priority: 2 ### Issue Component Component: Hop Gui -- This is an automated message from the Apache Git Service. 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