10110346 opened a new pull request #23998: [MINOR][SQL]Added a conf to control subqueryReuse URL: https://github.com/apache/spark/pull/23998 ## What changes were proposed in this pull request? Subquery Reuse and Exchange Reuse are not the same feature， if we don't want to reuse subqueries，and we just want to reuse exchanges，only one configuration that cannot be done. This PR adds a new configuration `spark.sql.subquery.reuse` to control subqueryReuse. ## How was this patch tested? N/A
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