[SPARK-32364][SQL][2.4] Use CaseInsensitiveMap for DataFrameReader/Writer options#29209

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dongjoon-hyun wants to merge 1 commit intoapache:branch-2.4from dongjoon-hyun:SPARK-32364-2.4

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Commits on Jul 23, 2020

[SPARK-32364 ][SQL] Use CaseInsensitiveMap for DataFrameReader/Writer options
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