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Rethink representation of PathTargets.

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In commit 19a541143a I did not make PathTarget a subtype of Node,
and embedded a RelOptInfo's reltarget directly into it rather than having
a separately-allocated Node.  In hindsight that was misguided
micro-optimization, enabled by the fact that at that point we didn't have
any Paths with custom PathTargets.  Now that PathTarget processing has
been fleshed out some more, it's easier to see that it's better to have
PathTarget as an indepedent Node type, even if it does cost us one more
palloc to create a RelOptInfo.  So change it while we still can.

This commit just changes the representation, without doing anything more
interesting than that.
This commit is contained in:
Tom Lane
2016-03-14 16:59:59 -04:00
parent 07341a2980
commit 307c78852f
18 changed files with 143 additions and 138 deletions
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doc/src/sgml/fdwhandler.sgml
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@ -1173,7 +1173,7 @@ GetForeignServerByName(const char *name, bool missing_ok);
it contains restriction quals (<literal>WHERE</> clauses) that should be
used to filter the rows to be fetched. (The FDW itself is not required
to enforce these quals, as the core executor can check them instead.)
<literal>baserel-&gt;reltarget.exprs</> can be used to determine which
<literal>baserel-&gt;reltarget-&gt;exprs</> can be used to determine which
columns need to be fetched; but note that it only lists columns that
have to be emitted by the <structname>ForeignScan</> plan node, not
columns that are used in qual evaluation but not output by the query.