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bf6cc19e34
Tuple conversion incorrectly concluded that no conversion was needed as long as all the attributes lined up. But if the source tuple has a missing attribute (from addition of a column with default), then the destination tupdesc might not reflect the same default. The typical symptom was that the affected columns would be unexpectedly NULL. Repair by always forcing conversion if the source has missing attributes, which will be filled in by the deform operation. (In theory we could optimize for when the destination has the same default, but that seemed overkill.) Backpatch to 11 where missing attributes were added. Per bug #16242. Vik Fearing (discovery, code, testing) and me (analysis, testcase). Discussion: https://postgr.es/m/16242-d1c9fca28445966b@postgresql.org |
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