[SPARK-23683][SQL] FileCommitProtocol.instantiate() hardening#20824

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steveloughran wants to merge 3 commits intoapache:masterfrom

steveloughran:stevel/SPARK-23683-protocol-instantiate

Commits on Mar 14, 2018

With SPARK-20236, FileCommitProtocol.instantiate() looks for a three argument constructor, passing in the dynamicPartitionOverwrite parameter. If there is no such constructor, it falls back to the …
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SPARK-20236: fix style typo and improve failure reporting on an assertion
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Commits on Mar 15, 2018

SPARK-23683 document why the test is not using assert() to validate exception handling
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