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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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12
src/backend/tcop/postgres.c
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@ -850,7 +850,7 @@ pg_plan_queries(List *querytrees, int cursorOptions, ParamListInfo boundParams)
foreach(query_list, querytrees)
{
Query *query = castNode(Query, lfirst(query_list));
Query *query = lfirst_node(Query, query_list);
PlannedStmt *stmt;
if (query->commandType == CMD_UTILITY)
@ -966,7 +966,7 @@ exec_simple_query(const char *query_string)
*/
foreach(parsetree_item, parsetree_list)
{
RawStmt *parsetree = castNode(RawStmt, lfirst(parsetree_item));
RawStmt *parsetree = lfirst_node(RawStmt, parsetree_item);
bool snapshot_set = false;
const char *commandTag;
char completionTag[COMPLETION_TAG_BUFSIZE];
@ -1291,7 +1291,7 @@ exec_parse_message(const char *query_string, /* string to execute */
bool snapshot_set = false;
int i;
raw_parse_tree = castNode(RawStmt, linitial(parsetree_list));
raw_parse_tree = linitial_node(RawStmt, parsetree_list);
/*
* Get the command name for possible use in status display.
@ -2154,7 +2154,7 @@ errdetail_execute(List *raw_parsetree_list)
foreach(parsetree_item, raw_parsetree_list)
{
RawStmt *parsetree = castNode(RawStmt, lfirst(parsetree_item));
RawStmt *parsetree = lfirst_node(RawStmt, parsetree_item);
if (IsA(parsetree->stmt, ExecuteStmt))
{
@ -2508,7 +2508,7 @@ IsTransactionExitStmtList(List *pstmts)
{
if (list_length(pstmts) == 1)
{
PlannedStmt *pstmt = castNode(PlannedStmt, linitial(pstmts));
PlannedStmt *pstmt = linitial_node(PlannedStmt, pstmts);
if (pstmt->commandType == CMD_UTILITY &&
IsTransactionExitStmt(pstmt->utilityStmt))
@ -2523,7 +2523,7 @@ IsTransactionStmtList(List *pstmts)
{
if (list_length(pstmts) == 1)
{
PlannedStmt *pstmt = castNode(PlannedStmt, linitial(pstmts));
PlannedStmt *pstmt = linitial_node(PlannedStmt, pstmts);
if (pstmt->commandType == CMD_UTILITY &&
IsA(pstmt->utilityStmt, TransactionStmt))