database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-08 11:42:09 +03:00
Code Activity

Reimplement the linked list data structure used throughout the backend.

Browse Source 
In the past, we used a 'Lispy' linked list implementation: a "list" was
merely a pointer to the head node of the list. The problem with that
design is that it makes lappend() and length() linear time. This patch
fixes that problem (and others) by maintaining a count of the list
length and a pointer to the tail node along with each head node pointer.
A "list" is now a pointer to a structure containing some meta-data
about the list; the head and tail pointers in that structure refer
to ListCell structures that maintain the actual linked list of nodes.

The function names of the list API have also been changed to, I hope,
be more logically consistent. By default, the old function names are
still available; they will be disabled-by-default once the rest of
the tree has been updated to use the new API names.
This commit is contained in:
Neil Conway
2004-05-26 04:41:50 +00:00
parent 18d0d10563
commit d0b4399d81
125 changed files with 3639 additions and 3038 deletions
Download Patch File Download Diff File Expand all files Collapse all files

51
src/backend/commands/copy.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/copy.c,v 1.223 2004/04/21 00:34:18 momjian Exp $
* $PostgreSQL: pgsql/src/backend/commands/copy.c,v 1.224 2004/05/26 04:41:10 neilc Exp $
*
*-------------------------------------------------------------------------
*/
@ -685,7 +685,7 @@ DoCopy(const CopyStmt *stmt)
char *filename = stmt->filename;
bool is_from = stmt->is_from;
bool pipe = (stmt->filename == NULL);
List *option;
ListCell *option;
List *attnamelist = stmt->attlist;
List *attnumlist;
bool binary = false;
@ -934,15 +934,15 @@ DoCopy(const CopyStmt *stmt)
{
TupleDesc tupDesc = RelationGetDescr(rel);
Form_pg_attribute *attr = tupDesc->attrs;
List *cur;
ListCell *cur;
force_quote_atts = CopyGetAttnums(rel, force_quote);
foreach(cur, force_quote_atts)
{
int attnum = lfirsti(cur);
int attnum = lfirst_int(cur);
if (!intMember(attnum, attnumlist))
if (!list_member_int(attnumlist, attnum))
ereport(ERROR,
(errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
errmsg("FORCE QUOTE column \"%s\" not referenced by COPY",
@ -955,7 +955,7 @@ DoCopy(const CopyStmt *stmt)
*/
if (force_notnull)
{
List *cur;
ListCell *cur;
TupleDesc tupDesc = RelationGetDescr(rel);
Form_pg_attribute *attr = tupDesc->attrs;
@ -963,9 +963,9 @@ DoCopy(const CopyStmt *stmt)
foreach(cur, force_notnull_atts)
{
int attnum = lfirsti(cur);
int attnum = lfirst_int(cur);
if (!intMember(attnum, attnumlist))
if (!list_member_int(attnumlist, attnum))
ereport(ERROR,
(errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
errmsg("FORCE NOT NULL column \"%s\" not referenced by COPY",
@ -1011,7 +1011,7 @@ DoCopy(const CopyStmt *stmt)
if (pipe)
{
if (whereToSendOutput == Remote)
ReceiveCopyBegin(binary, length(attnumlist));
ReceiveCopyBegin(binary, list_length(attnumlist));
else
copy_file = stdin;
}
@ -1062,7 +1062,7 @@ DoCopy(const CopyStmt *stmt)
if (pipe)
{
if (whereToSendOutput == Remote)
SendCopyBegin(binary, length(attnumlist));
SendCopyBegin(binary, list_length(attnumlist));
else
copy_file = stdout;
}
@ -1147,14 +1147,14 @@ CopyTo(Relation rel, List *attnumlist, bool binary, bool oids,
bool *isvarlena;
char *string;
Snapshot mySnapshot;
List *cur;
ListCell *cur;
MemoryContext oldcontext;
MemoryContext mycontext;
tupDesc = rel->rd_att;
attr = tupDesc->attrs;
num_phys_attrs = tupDesc->natts;
attr_count = length(attnumlist);
attr_count = list_length(attnumlist);
/*
* Get info about the columns we need to process.
@ -1167,7 +1167,7 @@ CopyTo(Relation rel, List *attnumlist, bool binary, bool oids,
force_quote = (bool *) palloc((num_phys_attrs + 1) * sizeof(bool));
foreach(cur, attnumlist)
{
int attnum = lfirsti(cur);
int attnum = lfirst_int(cur);
Oid out_func_oid;
if (binary)
@ -1180,7 +1180,7 @@ CopyTo(Relation rel, List *attnumlist, bool binary, bool oids,
&isvarlena[attnum - 1]);
fmgr_info(out_func_oid, &out_functions[attnum - 1]);
if (intMember(attnum, force_quote_atts))
if (list_member_int(force_quote_atts, attnum))
force_quote[attnum - 1] = true;
else
force_quote[attnum - 1] = false;
@ -1266,7 +1266,7 @@ CopyTo(Relation rel, List *attnumlist, bool binary, bool oids,
foreach(cur, attnumlist)
{
int attnum = lfirsti(cur);
int attnum = lfirst_int(cur);
Datum value;
bool isnull;
@ -1451,7 +1451,6 @@ CopyFrom(Relation rel, List *attnumlist, bool binary, bool oids,
bool hasConstraints = false;
int attnum;
int i;
List *cur;
Oid in_func_oid;
Datum *values;
char *nulls;
@ -1471,7 +1470,7 @@ CopyFrom(Relation rel, List *attnumlist, bool binary, bool oids,
tupDesc = RelationGetDescr(rel);
attr = tupDesc->attrs;
num_phys_attrs = tupDesc->natts;
attr_count = length(attnumlist);
attr_count = list_length(attnumlist);
num_defaults = 0;
/*
@ -1526,13 +1525,13 @@ CopyFrom(Relation rel, List *attnumlist, bool binary, bool oids,
&in_func_oid, &elements[attnum - 1]);
fmgr_info(in_func_oid, &in_functions[attnum - 1]);
if (intMember(attnum, force_notnull_atts))
if (list_member_int(force_notnull_atts, attnum))
force_notnull[attnum - 1] = true;
else
force_notnull[attnum - 1] = false;
/* Get default info if needed */
if (!intMember(attnum, attnumlist))
if (!list_member_int(attnumlist, attnum))
{
/* attribute is NOT to be copied from input */
/* use default value if one exists */
@ -1681,6 +1680,7 @@ CopyFrom(Relation rel, List *attnumlist, bool binary, bool oids,
{
CopyReadResult result = NORMAL_ATTR;
char *string;
ListCell *cur;
/* Actually read the line into memory here */
done = CopyReadLine();
@ -1722,7 +1722,7 @@ CopyFrom(Relation rel, List *attnumlist, bool binary, bool oids,
*/
foreach(cur, attnumlist)
{
int attnum = lfirsti(cur);
int attnum = lfirst_int(cur);
int m = attnum - 1;
/*
@ -1783,6 +1783,7 @@ CopyFrom(Relation rel, List *attnumlist, bool binary, bool oids,
{
/* binary */
int16 fld_count;
ListCell *cur;
fld_count = CopyGetInt16();
if (CopyGetEof() || fld_count == -1)
@ -1815,7 +1816,7 @@ CopyFrom(Relation rel, List *attnumlist, bool binary, bool oids,
i = 0;
foreach(cur, attnumlist)
{
int attnum = lfirsti(cur);
int attnum = lfirst_int(cur);
int m = attnum - 1;
copy_attname = NameStr(attr[m]->attname);
@ -2642,13 +2643,13 @@ CopyGetAttnums(Relation rel, List *attnamelist)
{
if (attr[i]->attisdropped)
continue;
attnums = lappendi(attnums, i + 1);
attnums = lappend_int(attnums, i + 1);
}
}
else
{
/* Validate the user-supplied list and extract attnums */
List *l;
ListCell *l;
foreach(l, attnamelist)
{
@ -2659,12 +2660,12 @@ CopyGetAttnums(Relation rel, List *attnamelist)
/* Note we disallow system columns here */
attnum = attnameAttNum(rel, name, false);
/* Check for duplicates */
if (intMember(attnum, attnums))
if (list_member_int(attnums, attnum))
ereport(ERROR,
(errcode(ERRCODE_DUPLICATE_COLUMN),
errmsg("column \"%s\" specified more than once",
name)));
attnums = lappendi(attnums, attnum);
attnums = lappend_int(attnums, attnum);
}
}