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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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2
src/backend/nodes/outfuncs.c
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@@ -2509,6 +2509,8 @@ _outAppendRelInfo(StringInfo str, const AppendRelInfo *node)
WRITE_OID_FIELD(parent_reltype);
WRITE_OID_FIELD(child_reltype);
WRITE_NODE_FIELD(translated_vars);
WRITE_INT_FIELD(num_child_cols);
WRITE_ATTRNUMBER_ARRAY(parent_colnos, node->num_child_cols);
WRITE_OID_FIELD(parent_reloid);
}