I was trying to upload the vocab files (Jan 2020). In addition to the format issues discussed here, am able to see that there is NULL value for concept_name in the concept.csv file.
But we have a NOT-NULL constraint defined in concept table. I found out that the records missing has concept ids 36311145, 35941270,45880107, 1379212 ,8497 which in Athena has
NAs . But in csv file it is blank/empty
Though I have updated in the concept.csv files for our use, just thought of reporting.