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https://issues.apache.org/jira/browse/SPARK-34031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17259709#comment-17259709
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Apache Spark commented on SPARK-34031:
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User 'wangyum' has created a pull request for this issue:
https://github.com/apache/spark/pull/31068
> Union operator missing rowCount when enable CBO
> -----------------------------------------------
>
> Key: SPARK-34031
> URL: https://issues.apache.org/jira/browse/SPARK-34031
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: Yuming Wang
> Priority: Major
>
> {code:scala}
> spark.sql("CREATE TABLE t1 USING parquet AS SELECT id FROM RANGE(10)")
> spark.sql("CREATE TABLE t2 USING parquet AS SELECT id FROM RANGE(10)")
> spark.sql("ANALYZE TABLE t1 COMPUTE STATISTICS FOR ALL COLUMNS")
> spark.sql("ANALYZE TABLE t2 COMPUTE STATISTICS FOR ALL COLUMNS")
> spark.sql("set spark.sql.cbo.enabled=true")
> spark.sql("SELECT * FROM t1 UNION ALL SELECT * FROM t2").explain("cost")
> {code}
> Current:
> {noformat}
> == Optimized Logical Plan ==
> Union false, false, Statistics(sizeInBytes=320.0 B)
> :- Relation[id#5880L] parquet, Statistics(sizeInBytes=160.0 B, rowCount=10)
> +- Relation[id#5881L] parquet, Statistics(sizeInBytes=160.0 B, rowCount=10)
> {noformat}
> Expected
> {noformat}
> == Optimized Logical Plan ==
> Union false, false, Statistics(sizeInBytes=320.0 B, rowCount=20)
> :- Relation[id#2138L] parquet, Statistics(sizeInBytes=160.0 B, rowCount=10)
> +- Relation[id#2139L] parquet, Statistics(sizeInBytes=160.0 B, rowCount=10)
> {noformat}
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