fuwhu opened a new pull request #26356: [SPARK-29707][SQL] Add configuration 'spark.sql.maxDataSourceScanMetadataStringLength' URL: https://github.com/apache/spark/pull/26356 ### What changes were proposed in this pull request? Add configuration 'spark.sql.maxDataSourceScanMetadataStringLength' to set the max string length of one metadata in DataSourceScanExec. ### Why are the changes needed? To make the max length of metadata string of `DataSourceScanExec` configurable, please see [SPARK-29707](https://issues.apache.org/jira/browse/SPARK-29707) for details. ### Does this PR introduce any user-facing change? Yes, user can configure the parameter to get more information about data source scan metadata. ### How was this patch tested? Manual test.
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