fix: EXPOSED-226 Upsert fails with only key columns in update #1900
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If all columns in an
upsert()
block are conflict/key columns, andonUpdate
is not set, an empty update clause is generated, which throws an SQLException in all databases except MySQL and MariaDB.It is important to allow key columns in the update clause for databases that do not support
insertIgnore()
and must use upsert to achieve this functionality.Including these key columns is valid SQL in all databases except Oracle, which throws
ORA-38104: Columns referenced in the ON Clause cannot be updated
.So filtering the update columns now only happens if the result will not be an empty list.