kiszk opened a new pull request #23420: [SPARK-26508][Core][SQL] Address warning messages in Java reported at lgtm.com URL: https://github.com/apache/spark/pull/23420 ## What changes were proposed in this pull request? This PR addresses warning messages in Java files reported at [lgtm.com](https://lgtm.com). [lgtm.com](https://lgtm.com) provides automated code review of Java/Python/JavaScript files for OSS projects. [Here](https://lgtm.com/projects/g/apache/spark/alerts/?mode=list&severity=warning) are warning messages regarding Apache Spark project. This PR addresses the following warnings: - Result of multiplication cast to wider type - Implicit narrowing conversion in compound assignment - Boxed variable is never null - Useless null check NOTE: `Potential input resource leak` looks false positive for now. ## How was this patch tested? Existing UTs
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