Fix SQL statement to calculate updated_at when upserting
#1320
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The previous `CASE` statement used `COALESCE` with `'NULL'` as a fallback value if either `source` or `target` were `NULL`. However, `'NULL'` as written in this statement, is a `varchar` and therefore does not work when comparing with other datatypes. This commit changes the switch statement to check if either both values are equal, or both values are actually `NULL`.
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The previous
CASEstatement usedCOALESCEwith'NULL'as a fallback value if eithersourceortargetwereNULL. However,'NULL'as written in this statement, is avarcharand therefore does not work when comparing with other datatypes (e.g.int).This commit changes the switch statement to check if either both values are equal, or both values are actually
NULL.