SPARK-364 overwrite to keep collection options #123
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added way to configure collection truncate approach in
overwritewriting mode.new write option:
truncate_modemight have one of the following options:DROPsame as before. Just drop collection and create new one with default configurationDELETE_ALLexpensive delete all query. Keeps original collection, but slowly deletes all documents from itRECREATEsaves previous options and indexes, drops the collection, creates new collection with the same options and indexes