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> Am Son, 2003-06-22 um 02.09 schrieb Joe Conway:

Browse Source 
>>Sounds like all that's needed for your case. But to be complete, in
>>addition to changing tablefunc.c we'd have to:
>>1) come up with a new function call signature that makes sense and does
>>not cause backward compatibility problems for other people
>>2) make needed changes to tablefunc.sql.in
>>3) adjust the README.tablefunc appropriately
>>4) adjust the regression test for new functionality
>>5) be sure we don't break any of the old cases
>>
>>If you want to submit a complete patch, it would be gratefully accepted
>>-- for review at least ;-)
>
> Here's the patch, at least for steps 1-3

Nabil Sayegh
Joe Conway
This commit is contained in:
Bruce Momjian
2003-07-27 03:51:59 +00:00
parent 9ae6905520
commit a265b7f70a
7 changed files with 309 additions and 61 deletions
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212
contrib/tablefunc/tablefunc.c
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@ -4,6 +4,8 @@
* Sample to demonstrate C functions which return setof scalar
* and setof composite.
* Joe Conway <mail@joeconway.com>
* And contributors:
* Nabil Sayegh <postgresql@e-trolley.de>
*
* Copyright 2002 by PostgreSQL Global Development Group
*
@ -45,7 +47,7 @@ static Tuplestorestate *get_crosstab_tuplestore(char *sql,
int num_categories,
TupleDesc tupdesc,
MemoryContext per_query_ctx);
static void validateConnectbyTupleDesc(TupleDesc tupdesc, bool show_branch);
static void validateConnectbyTupleDesc(TupleDesc tupdesc, bool show_branch, bool show_serial);
static bool compatCrosstabTupleDescs(TupleDesc tupdesc1, TupleDesc tupdesc2);
static bool compatConnectbyTupleDescs(TupleDesc tupdesc1, TupleDesc tupdesc2);
static void get_normal_pair(float8 *x1, float8 *x2);
@ -54,21 +56,26 @@ static TupleDesc make_crosstab_tupledesc(TupleDesc spi_tupdesc,
static Tuplestorestate *connectby(char *relname,
char *key_fld,
char *parent_key_fld,
char *orderby_fld,
char *branch_delim,
char *start_with,
int max_depth,
bool show_branch,
bool show_serial,
MemoryContext per_query_ctx,
AttInMetadata *attinmeta);
static Tuplestorestate *build_tuplestore_recursively(char *key_fld,
char *parent_key_fld,
char *relname,
char *orderby_fld,
char *branch_delim,
char *start_with,
char *branch,
int level,
int *serial,
int max_depth,
bool show_branch,
bool show_serial,
MemoryContext per_query_ctx,
AttInMetadata *attinmeta,
Tuplestorestate *tupstore);
@ -1017,31 +1024,32 @@ get_crosstab_tuplestore(char *sql,
*
* e.g. given table foo:
*
* keyid parent_keyid
* ------+--------------
* row1 NULL
* row2 row1
* row3 row1
* row4 row2
* row5 row2
* row6 row4
* row7 row3
* row8 row6
* row9 row5
* keyid parent_keyid pos
* ------+------------+--
* row1 NULL 0
* row2 row1 0
* row3 row1 0
* row4 row2 1
* row5 row2 0
* row6 row4 0
* row7 row3 0
* row8 row6 0
* row9 row5 0
*
*
* connectby(text relname, text keyid_fld, text parent_keyid_fld,
* text start_with, int max_depth [, text branch_delim])
* connectby('foo', 'keyid', 'parent_keyid', 'row2', 0, '~') returns:
* connectby(text relname, text keyid_fld, text parent_keyid_fld
* [, text orderby_fld], text start_with, int max_depth
* [, text branch_delim])
* connectby('foo', 'keyid', 'parent_keyid', 'pos', 'row2', 0, '~') returns:
*
* keyid parent_id level branch
* keyid parent_id level branch serial
* ------+-----------+--------+-----------------------
* row2 NULL 0 row2
* row4 row2 1 row2~row4
* row6 row4 2 row2~row4~row6
* row8 row6 3 row2~row4~row6~row8
* row5 row2 1 row2~row5
* row9 row5 2 row2~row5~row9
* row2 NULL 0 row2 1
* row5 row2 1 row2~row5 2
* row9 row5 2 row2~row5~row9 3
* row4 row2 1 row2~row4 4
* row6 row4 2 row2~row4~row6 5
* row8 row6 3 row2~row4~row6~row8 6
*
*/
PG_FUNCTION_INFO_V1(connectby_text);
@ -1059,6 +1067,7 @@ connectby_text(PG_FUNCTION_ARGS)
int max_depth = PG_GETARG_INT32(4);
char *branch_delim = NULL;
bool show_branch = false;
bool show_serial = false;
ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
TupleDesc tupdesc;
AttInMetadata *attinmeta;
@ -1088,7 +1097,7 @@ connectby_text(PG_FUNCTION_ARGS)
tupdesc = CreateTupleDescCopy(rsinfo->expectedDesc);
/* does it meet our needs */
validateConnectbyTupleDesc(tupdesc, show_branch);
validateConnectbyTupleDesc(tupdesc, show_branch, show_serial);
/* OK, use it then */
attinmeta = TupleDescGetAttInMetadata(tupdesc);
@ -1105,10 +1114,12 @@ connectby_text(PG_FUNCTION_ARGS)
rsinfo->setResult = connectby(relname,
key_fld,
parent_key_fld,
NULL,
branch_delim,
start_with,
max_depth,
show_branch,
show_serial,
per_query_ctx,
attinmeta);
rsinfo->setDesc = tupdesc;
@ -1125,6 +1136,85 @@ connectby_text(PG_FUNCTION_ARGS)
return (Datum) 0;
}
PG_FUNCTION_INFO_V1(connectby_text_serial);
Datum
connectby_text_serial(PG_FUNCTION_ARGS)
{
char *relname = GET_STR(PG_GETARG_TEXT_P(0));
char *key_fld = GET_STR(PG_GETARG_TEXT_P(1));
char *parent_key_fld = GET_STR(PG_GETARG_TEXT_P(2));
char *orderby_fld = GET_STR(PG_GETARG_TEXT_P(3));
char *start_with = GET_STR(PG_GETARG_TEXT_P(4));
int max_depth = PG_GETARG_INT32(5);
char *branch_delim = NULL;
bool show_branch = false;
bool show_serial = true;
ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo;
TupleDesc tupdesc;
AttInMetadata *attinmeta;
MemoryContext per_query_ctx;
MemoryContext oldcontext;
/* check to see if caller supports us returning a tuplestore */
if (!rsinfo || !(rsinfo->allowedModes & SFRM_Materialize))
elog(ERROR, "connectby: materialize mode required, but it is not "
"allowed in this context");
if (fcinfo->nargs == 7)
{
branch_delim = GET_STR(PG_GETARG_TEXT_P(6));
show_branch = true;
}
else
/* default is no show, tilde for the delimiter */
branch_delim = pstrdup("~");
per_query_ctx = rsinfo->econtext->ecxt_per_query_memory;
oldcontext = MemoryContextSwitchTo(per_query_ctx);
/* get the requested return tuple description */
tupdesc = CreateTupleDescCopy(rsinfo->expectedDesc);
/* does it meet our needs */
validateConnectbyTupleDesc(tupdesc, show_branch, show_serial);
/* OK, use it then */
attinmeta = TupleDescGetAttInMetadata(tupdesc);
/* check to see if caller supports us returning a tuplestore */
if (!rsinfo->allowedModes & SFRM_Materialize)
elog(ERROR, "connectby requires Materialize mode, but it is not "
"allowed in this context");
/* OK, go to work */
rsinfo->returnMode = SFRM_Materialize;
rsinfo->setResult = connectby(relname,
key_fld,
parent_key_fld,
orderby_fld,
branch_delim,
start_with,
max_depth,
show_branch,
show_serial,
per_query_ctx,
attinmeta);
rsinfo->setDesc = tupdesc;
MemoryContextSwitchTo(oldcontext);
/*
* SFRM_Materialize mode expects us to return a NULL Datum. The actual
* tuples are in our tuplestore and passed back through
* rsinfo->setResult. rsinfo->setDesc is set to the tuple description
* that we actually used to build our tuples with, so the caller can
* verify we did what it was expecting.
*/
return (Datum) 0;
}
/*
* connectby - does the real work for connectby_text()
*/
@ -1132,10 +1222,12 @@ static Tuplestorestate *
connectby(char *relname,
char *key_fld,
char *parent_key_fld,
char *orderby_fld,
char *branch_delim,
char *start_with,
int max_depth,
bool show_branch,
bool show_serial,
MemoryContext per_query_ctx,
AttInMetadata *attinmeta)
{
@ -1143,6 +1235,8 @@ connectby(char *relname,
int ret;
MemoryContext oldcontext;
int serial = 1;
/* Connect to SPI manager */
if ((ret = SPI_connect()) < 0)
/* internal error */
@ -1160,12 +1254,15 @@ connectby(char *relname,
tupstore = build_tuplestore_recursively(key_fld,
parent_key_fld,
relname,
orderby_fld,
branch_delim,
start_with,
start_with, /* current_branch */
0, /* initial level is 0 */
&serial, /* initial serial is 1 */
max_depth,
show_branch,
show_serial,
per_query_ctx,
attinmeta,
tupstore);
@ -1179,12 +1276,15 @@ static Tuplestorestate *
build_tuplestore_recursively(char *key_fld,
char *parent_key_fld,
char *relname,
char *orderby_fld,
char *branch_delim,
char *start_with,
char *branch,
int level,
int *serial,
int max_depth,
bool show_branch,
bool show_serial,
MemoryContext per_query_ctx,
AttInMetadata *attinmeta,
Tuplestorestate *tupstore)
@ -1194,18 +1294,35 @@ build_tuplestore_recursively(char *key_fld,
StringInfo sql = makeStringInfo();
int ret;
int proc;
int serial_column;
if (max_depth > 0 && level > max_depth)
return tupstore;
/* Build initial sql statement */
appendStringInfo(sql, "SELECT %s, %s FROM %s WHERE %s = '%s' AND %s IS NOT NULL",
if (!show_serial)
{
appendStringInfo(sql, "SELECT %s, %s FROM %s WHERE %s = '%s' AND %s IS NOT NULL",
key_fld,
parent_key_fld,
relname,
parent_key_fld,
start_with,
key_fld);
serial_column=0;
}
else
{
appendStringInfo(sql, "SELECT %s, %s FROM %s WHERE %s = '%s' AND %s IS NOT NULL ORDER BY %s",
key_fld,
parent_key_fld,
relname,
parent_key_fld,
start_with,
key_fld,
orderby_fld);
serial_column=1;
}
/* Retrieve the desired rows */
ret = SPI_exec(sql->data, 0);
@ -1222,6 +1339,7 @@ build_tuplestore_recursively(char *key_fld,
char *current_key;
char *current_key_parent;
char current_level[INT32_STRLEN];
char serial_str[INT32_STRLEN];
char *current_branch;
char **values;
StringInfo branchstr = NULL;
@ -1236,9 +1354,9 @@ build_tuplestore_recursively(char *key_fld,
chk_current_key = makeStringInfo();
if (show_branch)
values = (char **) palloc(CONNECTBY_NCOLS * sizeof(char *));
values = (char **) palloc((CONNECTBY_NCOLS + serial_column) * sizeof(char *));
else
values = (char **) palloc(CONNECTBY_NCOLS_NOBRANCH * sizeof(char *));
values = (char **) palloc((CONNECTBY_NCOLS_NOBRANCH + serial_column) * sizeof(char *));
/* First time through, do a little setup */
if (level == 0)
@ -1270,6 +1388,16 @@ build_tuplestore_recursively(char *key_fld,
if (show_branch)
values[3] = start_with;
/* root starts the serial with 1 */
if (show_serial)
{
sprintf(serial_str, "%d", (*serial)++);
if (show_branch)
values[4] = serial_str;
else
values[3] = serial_str;
}
/* construct the tuple */
tuple = BuildTupleFromCStrings(attinmeta, values);
@ -1317,6 +1445,14 @@ build_tuplestore_recursively(char *key_fld,
values[2] = current_level;
if (show_branch)
values[3] = current_branch;
if (show_serial)
{
sprintf(serial_str, "%d", (*serial)++);
if (show_branch)
values[4] = serial_str;
else
values[3] = serial_str;
}
tuple = BuildTupleFromCStrings(attinmeta, values);
@ -1338,12 +1474,15 @@ build_tuplestore_recursively(char *key_fld,
tupstore = build_tuplestore_recursively(key_fld,
parent_key_fld,
relname,
orderby_fld,
branch_delim,
values[0],
current_branch,
level + 1,
serial,
max_depth,
show_branch,
show_serial,
per_query_ctx,
attinmeta,
tupstore);
@ -1367,12 +1506,17 @@ build_tuplestore_recursively(char *key_fld,
* Check expected (query runtime) tupdesc suitable for Connectby
*/
static void
validateConnectbyTupleDesc(TupleDesc tupdesc, bool show_branch)
validateConnectbyTupleDesc(TupleDesc tupdesc, bool show_branch, bool show_serial)
{
int serial_column=0;
if (show_serial)
serial_column=1;
/* are there the correct number of columns */
if (show_branch)
{
if (tupdesc->natts != CONNECTBY_NCOLS)
if (tupdesc->natts != (CONNECTBY_NCOLS + serial_column))
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("invalid return type"),
@ -1381,7 +1525,7 @@ validateConnectbyTupleDesc(TupleDesc tupdesc, bool show_branch)
}
else
{
if (tupdesc->natts != CONNECTBY_NCOLS_NOBRANCH)
if (tupdesc->natts != CONNECTBY_NCOLS_NOBRANCH + serial_column)
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("invalid return type"),
@ -1412,6 +1556,16 @@ validateConnectbyTupleDesc(TupleDesc tupdesc, bool show_branch)
errdetail("Fourth column must be type %s.",
format_type_be(TEXTOID))));
/* check that the type of the fifth column is INT4 */
if (show_branch && show_serial && tupdesc->attrs[4]->atttypid != INT4OID)
elog(ERROR, "Query-specified return tuple not valid for Connectby: "
"fifth column must be type %s", format_type_be(INT4OID));
/* check that the type of the fifth column is INT4 */
if (!show_branch && show_serial && tupdesc->attrs[3]->atttypid != INT4OID)
elog(ERROR, "Query-specified return tuple not valid for Connectby: "
"fourth column must be type %s", format_type_be(INT4OID));
/* OK, the tupdesc is valid for our purposes */
}