zhengruifeng opened a new pull request, #47853:
URL: https://github.com/apache/spark/pull/47853
### What changes were proposed in this pull request?
Delay the ambiguous detection in column resolution
### Why are the changes needed?
bug fix:
```
from pyspark.sql.functions import concat, lit, col
df1 = spark.range(10).withColumn("value", lit(1))
df2 = df1.union(df1)
df1.join(df2, df1.id == df2.id, "left").show()
```
fails with `AMBIGUOUS_COLUMN_REFERENCE`
```
resolveExpressionByPlanChildren: e = '`==`('id, 'id)
resolveExpressionByPlanChildren: q =
'[id=63]Join LeftOuter, '`==`('id, 'id)
:- [id=61]Project [id#550L, 1 AS value#553]
: +- Range (0, 10, step=1, splits=Some(12))
+- [id=62]Union false, false
:- [id=61]Project [id#564L, 1 AS value#565]
: +- Range (0, 10, step=1, splits=Some(12))
+- [id=61]Project [id#566L, 1 AS value#567]
+- Range (0, 10, step=1, splits=Some(12))
'id with id = 61
[id=61]Project [id#564L, 1 AS value#565]
+- Range (0, 10, step=1, splits=Some(12))
[id=61]Project [id#566L, 1 AS value#567]
+- Range (0, 10, step=1, splits=Some(12))
resolved: Vector((Some((id#564L,1)),true), (Some((id#566L,1)),true))
```
When resolving `'id with id = 61`, it fails in the second child.
### Does this PR introduce _any_ user-facing change?
yes, bug fix
### How was this patch tested?
added tests
### Was this patch authored or co-authored using generative AI tooling?
No
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