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[SPARK-25829][SQL] Add config spark.sql.legacy.allowDuplicatedMapKeys and change the default behavior #27478

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xuanyuanking wants to merge 7 commits into from

rephrase the demo for map_concat

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[SPARK-25829][SQL] Add config spark.sql.legacy.allowDuplicatedMapKeys and change the default behavior #27478

rephrase the demo for map_concat
feb8c0a
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