Paul Holden
f4bf4dca36
This change overcomes limitations in certain DB engines (such as MySQL[1]) which can lead to truncation of data when applying group concatenation to columns. Ensure we account for that by validating that we are able to extract the expected number of fields from each concatenated value. [1] https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_group_concat_max_len
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