wangyum opened a new pull request #35286:
URL: https://github.com/apache/spark/pull/35286
### What changes were proposed in this pull request?
Use `Aggregate.aggregateExpressions` instead of `Aggregate.output` when
pushing down limit 1 through Aggregate.
For example:
```scala
spark.range(10).selectExpr("id % 5 AS a", "id % 5 AS
b").write.saveAsTable("t1")
spark.sql("SELECT a, b, a AS alias FROM t1 GROUP BY a, b LIMIT
1").explain(true)
```
Before this pr:
```
== Optimized Logical Plan ==
GlobalLimit 1
+- LocalLimit 1
+- !Project [a#227L, b#228L, alias#226L]
+- LocalLimit 1
+- Relation default.t1[a#227L,b#228L] parquet
```
After this pr:
```
== Optimized Logical Plan ==
GlobalLimit 1
+- LocalLimit 1
+- Project [a#227L, b#228L, a#227L AS alias#226L]
+- LocalLimit 1
+- Relation default.t1[a#227L,b#228L] parquet
```
### Why are the changes needed?
Fix bug.
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Unit test.
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