[tfenne]

A BAM record with a repeated tag could lose the tags that followed it; it now keeps them.

• BinaryTagCodec.readTags appends tags in sorted order through a tail pointer. A repeat of the tail's tag replaced that node via SAMBinaryTagAndValue.insert, but tail still pointed at the replaced node, so later appends went to a node no longer in the list: XA:A:a XA:A:b XB:A:c decoded as XA=b alone.
• The replacement now becomes the tail. The later value of the repeated tag is still the one kept, as in SAM text.
• Tests cover a repeat of the last tag, a repeat of the highest tag when tags arrive out of order, and a repeat of an earlier tag (which already worked).

Found while reading broadinstitute/picard#2063.

Fixes #1946

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• CHANGELOG.md

Walkthrough

BinaryTagCodec.readTags now updates its tail reference when a repeated tag replaces the last node. Tests verify that later tags remain present and that the later duplicate value is retained. The changelog records the fix in the 6.0.1 patch release.

Changes: BAM tag decoding

Layer / File(s)	Summary
Tail reference fix and validation src/main/java/htsjdk/samtools/BinaryTagCodec.java, src/test/java/htsjdk/samtools/BinaryTagCodecTest.java, CHANGELOG.md	readTags updates tail when a head insertion replaces the last node. Tests cover duplicates at the end, out of order, and earlier in the sequence. The changelog records the fix in 6.0.1.

Priority: Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: Low · previous review 94ddb

The fix preserves tags, but the release note may mislead users diagnosing previously affected records. Correcting the wording is a bounded follow-up.

Pre-merge checks: 5

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title "Keep a BAM record's other tags when one of its tags is repeated" matches the main change. The PR fixes BinaryTagCodec.readTags so that tags after a repeated tag are not lost when the repeat…
Linked Issues check		The PR satisfies the coding requirements in [#1946]. BinaryTagCodec.readTags updates tail when insert replaces the previous tail, so later tags remain linked. The replacement keeps the later dup…
Out of Scope Changes check		The changed source code directly fixes [#1946]. The added tests verify the required duplicate-tag behavior. The changelog entry documents the same fix. No unrelated change is shown.
Docstring Coverage		Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentat…

Full details: Title check

Explanation

The title "Keep a BAM record's other tags when one of its tags is repeated" matches the main change. The PR fixes BinaryTagCodec.readTags so that tags after a repeated tag are not lost when the repeated tag is the tail or the highest-sorting tag. The title names the BAM record context, the repeated-tag condition, and the retained tags, so a reader scanning history can identify the primary change.

Full details: Linked Issues check

Explanation

The PR satisfies the coding requirements in [#1946]. BinaryTagCodec.readTags updates tail when insert replaces the previous tail, so later tags remain linked. The replacement keeps the later duplicate value. Tests cover a duplicate of the last tag, an out-of-order duplicate of the highest tag, and a duplicate of an earlier tag.

Full details: Docstring Coverage

Explanation

Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 2 functions across 2 files. (1 skipped: 1 unsupported.)

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Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

Prompt to fix review comments

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @CHANGELOG.md:
- Line 19: Update the changelog entry describing repeated BAM tags to say that
later tags could be dropped, rather than implying every later tag above the
duplicate was lost. Preserve the example and the note that the later
repeated-tag value is kept.

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Files selected for processing: 3

• CHANGELOG.md
• src/main/java/htsjdk/samtools/BinaryTagCodec.java
• src/test/java/htsjdk/samtools/BinaryTagCodecTest.java

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