@anna -- Can you make it into a single file of a single step by using UNION ALL and exporting all tables at once? INSERT INTO FILES( "path"="s3a://Folder/ABC", ... "aws.s3.endpoint"="http://10.50.10.160:30104) SELECT COL_A From TABLE_A UNION ALL SELECT COL_B From TABLE_B UNION ALL SELECT COL_C From TABLE_C; NOTE: This won't take care of duplicates, but I figure you can do that before you run the export.

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