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postgres/src/backend/optimizer/util
Tom Lane ce76c0ba53 Add a reverse-translation column number array to struct AppendRelInfo.
This provides for cheaper mapping of child columns back to parent
columns.  The one existing use-case in examine_simple_variable()
would hardly justify this by itself; but an upcoming bug fix will
make use of this array in a mainstream code path, and it seems
likely that we'll find other uses for it as we continue to build
out the partitioning infrastructure.

Discussion: https://postgr.es/m/12424.1575168015@sss.pgh.pa.us
2019-12-02 18:05:29 -05:00
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