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Enhance JDBC Client and Beeline Client, like: Support running Python scripts and codes in Beeline, fix Http authentication exception message is empty, backport HIVE-19048: Initscript errors are ignored, backport HIVE-15820: comment at the head of beeline -e
Enhance submission engine related code, like: support yarn-client and yarn-cluster for YarnApplicationOperation, different engine submit timeout config, destroy build process when waitCompletion is false and engine is running in cluster mode
Fix many flaky tests and incorrect documentations

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