mattcasters opened a new pull request, #7487:
URL: https://github.com/apache/hop/pull/7487
## Summary
- Adds an **Align input layouts** option to Merge Rows (diff), enabled by
default (`align_input_layouts` with `defaultBoolean = true`), so reference and
compare streams can use different field layouts for CDC-style diffs.
- Builds a **reference-authoritative** field union before comparing: missing
fields are null-filled; shared fields keep the reference type (with conversion
for compare values); compare-only fields are appended.
- Strict legacy mode remains available with `align_input_layouts=N`.
- Integration tests cover existing behavior (base, diff JSON, passthrough),
new alignment, and strict align-off compatibility.
- **Integration test runner improvement:** `run-tests-docker.sh` /
`run-tests.sh` accept optional **`TEST_FILTER`** to run only matching
`main*.hwf` workflows (basename substring or shell glob, comma-separated).
Speeds up Docker IT debugging, e.g.:
```bash
bash integration-tests/scripts/run-tests-docker.sh \
PROJECT_NAME=transforms \
TEST_FILTER=0077-merge-rows
```
## Context
Addresses [#7393](https://github.com/apache/hop/issues/7393). Ports the
proven Merge Rows Plus layout-alignment approach from the neighbor
hop-data-vault project into core Merge Rows.
## Test plan
- [x] `./mvnw -pl plugins/transforms/mergerows -am test` (17 unit tests)
- [x] Integration suite via Hop client: `sh hop run -j "IT transforms" -f
main-0077-merge-rows.hwf -r local` — all five unit tests pass (base, diff,
passthrough, align, align-off)
- [x] Docker IT with rebuilt client zip + `TEST_FILTER=0077-merge-rows`
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