[SPARK-26560][SQL] Spark should be able to run Hive UDF using jar regardless of current thread context classloader#27025

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HeartSaVioR wants to merge 6 commits intoapache:masterfrom

HeartSaVioR:SPARK-26560-revised

Commits on Dec 27, 2019

[SPARK-26560][SQL]:Repeat select on HiveUDF fails

nivo091
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HeartSaVioR
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Add UT & relevant jar, change to cleaner fix
HeartSaVioR
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Commits on Dec 28, 2019

Just apply Spark ClassLoader to the test as only controlling thread classloader for tests in SQLQuerySuite didn't work
HeartSaVioR
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Commits on Dec 29, 2019

Commits on Dec 30, 2019

Explanation of the reason to change the classloader in test
HeartSaVioR
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