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由 Tom Lane 提交于
the column alias names of the RTE referenced by the Var to the RowExpr. This is needed to allow ruleutils.c to correctly deparse FieldSelect nodes referencing such a construct. Per my recent bug report. Adding a field to RowExpr forces initdb (because of stored rules changes) so this solution is not back-patchable; which is unfortunate because 8.2 and 8.3 have this issue. But it only affects EXPLAIN for some pretty odd corner cases, so we can probably live without a solution for the back branches.
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