francis0407 opened a new pull request #24321: SPARK-27411: DataSourceV2Strategy should not eliminate subquery URL: https://github.com/apache/spark/pull/24321 ## What changes were proposed in this pull request? In DataSourceV2Strategy, it seems we eliminate the subqueries by mistake after normalizing filters. We have an sql with a scalar subquery: ``` scala val plan = spark.sql("select * from t2 where t2a > (select max(t1a) from t1)") plan.explain(true) ``` And we get the log info of DataSourceV2Strategy: ``` Pushing operators to csv:examples/src/main/resources/t2.txt Pushed Filters: Post-Scan Filters: isnotnull(t2a#30) Output: t2a#30, t2b#31 ``` The `Post-Scan Filters` should contain the scalar subquery, but we eliminate it by mistake. ``` == Parsed Logical Plan == 'Project [*] +- 'Filter ('t2a > scalar-subquery#56 []) : +- 'Project [unresolvedalias('max('t1a), None)] : +- 'UnresolvedRelation `t1` +- 'UnresolvedRelation `t2` == Analyzed Logical Plan == t2a: string, t2b: string Project [t2a#30, t2b#31] +- Filter (t2a#30 > scalar-subquery#56 []) : +- Aggregate [max(t1a#13) AS max(t1a)#63] : +- SubqueryAlias `t1` : +- RelationV2[t1a#13, t1b#14] csv:examples/src/main/resources/t1.txt +- SubqueryAlias `t2` +- RelationV2[t2a#30, t2b#31] csv:examples/src/main/resources/t2.txt == Optimized Logical Plan == Filter (isnotnull(t2a#30) && (t2a#30 > scalar-subquery#56 [])) : +- Aggregate [max(t1a#13) AS max(t1a)#63] : +- Project [t1a#13] : +- RelationV2[t1a#13, t1b#14] csv:examples/src/main/resources/t1.txt +- RelationV2[t2a#30, t2b#31] csv:examples/src/main/resources/t2.txt == Physical Plan == *(1) Project [t2a#30, t2b#31] +- *(1) Filter isnotnull(t2a#30) +- *(1) BatchScan[t2a#30, t2b#31] class org.apache.spark.sql.execution.datasources.v2.csv.CSVScan ``` ## How was this patch tested? ut
---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
