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Improve castNode notation by introducing list-extraction-specific variants.

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This extends the castNode() notation introduced by commit 5bcab1114 to
provide, in one step, extraction of a list cell's pointer and coercion to
a concrete node type.  For example, "lfirst_node(Foo, lc)" is the same
as "castNode(Foo, lfirst(lc))".  Almost half of the uses of castNode
that have appeared so far include a list extraction call, so this is
pretty widely useful, and it saves a few more keystrokes compared to the
old way.

As with the previous patch, back-patch the addition of these macros to
pg_list.h, so that the notation will be available when back-patching.

Patch by me, after an idea of Andrew Gierth's.

Discussion: https://postgr.es/m/14197.1491841216@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2017-04-10 13:51:29 -04:00
parent 56dd8e85c4
commit 8f0530f580
65 changed files with 176 additions and 168 deletions
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6
src/backend/commands/explain.c
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@ -253,7 +253,7 @@ ExplainQuery(ParseState *pstate, ExplainStmt *stmt, const char *queryString,
/* Explain every plan */
foreach(l, rewritten)
{
ExplainOneQuery(castNode(Query, lfirst(l)),
ExplainOneQuery(lfirst_node(Query, l),
CURSOR_OPT_PARALLEL_OK, NULL, es,
queryString, params, queryEnv);
@ -408,7 +408,7 @@ ExplainOneUtility(Node *utilityStmt, IntoClause *into, ExplainState *es,
rewritten = QueryRewrite(castNode(Query, copyObject(ctas->query)));
Assert(list_length(rewritten) == 1);
ExplainOneQuery(castNode(Query, linitial(rewritten)),
ExplainOneQuery(linitial_node(Query, rewritten),
0, ctas->into, es,
queryString, params, queryEnv);
}
@ -427,7 +427,7 @@ ExplainOneUtility(Node *utilityStmt, IntoClause *into, ExplainState *es,
rewritten = QueryRewrite(castNode(Query, copyObject(dcs->query)));
Assert(list_length(rewritten) == 1);
ExplainOneQuery(castNode(Query, linitial(rewritten)),
ExplainOneQuery(linitial_node(Query, rewritten),
dcs->options, NULL, es,
queryString, params, queryEnv);
}