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Add a reverse-translation column number array to struct AppendRelInfo.

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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
This commit is contained in:
Tom Lane
2019-12-02 18:05:29 -05:00
parent 4526951d56
commit ce76c0ba53
8 changed files with 61 additions and 39 deletions
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src/backend/nodes/copyfuncs.c
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@@ -2327,6 +2327,8 @@ _copyAppendRelInfo(const AppendRelInfo *from)
COPY_SCALAR_FIELD(parent_reltype);
COPY_SCALAR_FIELD(child_reltype);
COPY_NODE_FIELD(translated_vars);
COPY_SCALAR_FIELD(num_child_cols);
COPY_POINTER_FIELD(parent_colnos, from->num_child_cols * sizeof(AttrNumber));
COPY_SCALAR_FIELD(parent_reloid);
return newnode;