huaxingao opened a new pull request, #44119:
URL: https://github.com/apache/spark/pull/44119
### What changes were proposed in this pull request?
Add `MergeInto` support in `DataFrameWriterV2`
### Why are the changes needed?
Spark currently supports merge into sql statement. We want DataFrame to have
the same support.
### Does this PR introduce _any_ user-facing change?
Yes. This PR introduces new API like the following:
```
spark.table("source")
.mergeInto("target")
.on($"source.id" === $"target.id")
.whenNotMatched()
.insertAll()
.merge()
```
### How was this patch tested?
new tests
### Was this patch authored or co-authored using generative AI tooling?
No
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