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Impala is preparing to switch to JDK17 for Java compilation by default. While the source version might remain in 1.8 for longer, we should experiment with targeting binary version 17. This patch adds IMPALA_JAVA_TARGET env var to control target binary version. It is initialized in impala-config-java.sh, depending on value of IMPALA_JDK_VERSION env var. Testing: Pass data load and FE tests with IMPALA_JDK_VERSION=17. Change-Id: If194d87c542d416b878661403c32c6adc2930199 Reviewed-on: http://gerrit.cloudera.org:8080/23096 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>