oleg-zinovev edited a comment on issue #1749: DRILL-7177: Format Plugin for Excel Files URL: https://github.com/apache/drill/pull/1749#issuecomment-519141613 Since I have same plugin for internal use (https://github.com/idvp-project/drill-storage-excel): 1) XSSFWorkbook has a awful memory usage. http://apache-poi.1045710.n5.nabble.com/HSSF-and-XSSF-memory-usage-some-numbers-td4312784.html. Reading a 10-15 mb Xlsx file can easily lead to OutOfMemory. So we used com.monitorjbl:xlsx-streamer project. (No support for a formula evaluation) 2) Excel does not guarantee that the column value type remains static. IMHO, it is better to read everything as VARCHAR.
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