loong created SPARK-55438:
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Summary: Rule CombineUnions makes cache invalid
Key: SPARK-55438
URL: https://issues.apache.org/jira/browse/SPARK-55438
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.5.8
Reporter: loong
{code:java}
spark.sql("select 1 as id").write.saveAsTable("tmp")
val df: DataFrame = spark.table("tmp")
.select($"id")
df.persist()
df.count()
df.select($"id".as("id_"))
.unionByName(df.select($"id".as("id_")))
.show()
{code}
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