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Michael Paquier ca7a0d1d36 Fix two issues with HEADER MATCH in COPY ... 072132f0 used the attnum offset to access the raw_fields array when checking that the attribute names of the header and of the relation match, leading to incorrect results or even crashes if the attribute numbers of a relation are changed, like on a dropped attribute. This fixes the logic to use the correct attribute names for the header matching requirements. Also, this commit disallows HEADER MATCH in COPY TO as there is no validation that can be done in this case. The tests are expanded for HEADER MATCH with COPY FROM and dropped columns, with cases where a relation has a dropped and re-added column, as well as a reduced set of columns. Author: Julien Rouhaud Reviewed-by: Peter Eisentraut, Michael Paquier Discussion: https://postgr.es/m/20220607154744.vvmitnqhyxrne5ms@jrouhaud		4 years ago
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src	Fix two issues with HEADER MATCH in COPY	4 years ago
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