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Remove option to change parser of an existing text search configuration.

Browse Source 
This prevents needing to do complex and poorly-defined updates of the
mapping table if the new parser has different token types than the old.
Per discussion.
REL8_3_STABLE
Tom Lane 18 years ago
parent 40c1d7c10e
commit 8a5592daf1
5 changed files with 33 additions and 139 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 30
      doc/src/sgml/ref/alter_tsconfig.sgml
  2. 9
      doc/src/sgml/ref/create_tsconfig.sgml
  3. 118
      src/backend/commands/tsearchcmds.c
  4. 11
      src/backend/parser/gram.y
  5. 4
      src/include/nodes/parsenodes.h

30
doc/src/sgml/ref/alter_tsconfig.sgml
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@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/alter_tsconfig.sgml,v 1.1 2007/08/21 21:08:47 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/alter_tsconfig.sgml,v 1.2 2007/08/22 05:13:50 tgl Exp $
PostgreSQL documentation
-->
@ -20,9 +20,6 @@ PostgreSQL documentation
<refsynopsisdiv>
<synopsis>
ALTER TEXT SEARCH CONFIGURATION <replaceable>name</replaceable> (
PARSER = <replaceable class="parameter">parser_name</replaceable>
)
ALTER TEXT SEARCH CONFIGURATION <replaceable>name</replaceable>
ADD MAPPING FOR <replaceable class="parameter">token_type</replaceable> [, ... ] WITH <replaceable class="parameter">dictionary_name</replaceable> [, ... ]
ALTER TEXT SEARCH CONFIGURATION <replaceable>name</replaceable>
@ -43,8 +40,8 @@ ALTER TEXT SEARCH CONFIGURATION <replaceable>name</replaceable> OWNER TO <replac
<para>
<command>ALTER TEXT SEARCH CONFIGURATION</command> changes the definition of
a text search configuration. You can change which parser it uses, modify
its mapping from token types to dictionaries,
a text search configuration. You can modify
its mappings from token types to dictionaries,
or change the configuration's name or owner.
</para>
@ -68,15 +65,6 @@ ALTER TEXT SEARCH CONFIGURATION <replaceable>name</replaceable> OWNER TO <replac
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">parser_name</replaceable></term>
<listitem>
<para>
The name of a new text search parser to use for this configuration.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><replaceable class="parameter">token_type</replaceable></term>
<listitem>
@ -154,19 +142,7 @@ ALTER TEXT SEARCH CONFIGURATION <replaceable>name</replaceable> OWNER TO <replac
</para>
</refsect1>
<refsect1>
<title>Notes</title>
<para>
While changing the text search parser used by a configuration is allowed,
this will only work nicely if old and new parsers use the same set of
token types. It is advisable to drop the mappings for any incompatible
token types before changing parsers.
</para>
</refsect1>
<refsect1>
<title>Examples</title>

9
doc/src/sgml/ref/create_tsconfig.sgml
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@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/create_tsconfig.sgml,v 1.1 2007/08/21 21:08:47 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/create_tsconfig.sgml,v 1.2 2007/08/22 05:13:50 tgl Exp $
PostgreSQL documentation
-->
@ -98,10 +98,9 @@ CREATE TEXT SEARCH CONFIGURATION <replaceable class="parameter">name</replaceabl
<title>Notes</title>
<para>
It is allowed to specify both <literal>PARSER</> and <literal>COPY</>,
resulting in the specified parser being used with whatever mappings
are in the source configuration. This is generally inadvisable,
unless you know that both parsers involved use the same token type set.
The <literal>PARSER</> and <literal>COPY</> options are mutually
exclusive, because when an existing configuration is copied, its
parser selection is copied too.
</para>
</refsect1>

118
src/backend/commands/tsearchcmds.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/tsearchcmds.c,v 1.3 2007/08/22 01:39:44 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/tsearchcmds.c,v 1.4 2007/08/22 05:13:50 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -46,12 +46,10 @@
#include "utils/syscache.h"
static HeapTuple UpdateTSConfiguration(AlterTSConfigurationStmt *stmt,
HeapTuple tup);
static void MakeConfigurationMapping(AlterTSConfigurationStmt *stmt,
HeapTuple tup);
HeapTuple tup, Relation relMap);
static void DropConfigurationMapping(AlterTSConfigurationStmt *stmt,
HeapTuple tup);
HeapTuple tup, Relation relMap);
/* --------------------- TS Parser commands ------------------------ */
@ -1265,7 +1263,6 @@ DefineTSConfiguration(List *names, List *parameters)
Oid namespaceoid;
char *cfgname;
NameData cname;
List *sourceName = NIL;
Oid sourceOid = InvalidOid;
Oid prsOid = InvalidOid;
Oid cfgOid;
@ -1290,7 +1287,7 @@ DefineTSConfiguration(List *names, List *parameters)
if (pg_strcasecmp(defel->defname, "parser") == 0)
prsOid = TSParserGetPrsid(defGetQualifiedName(defel), false);
else if (pg_strcasecmp(defel->defname, "copy") == 0)
sourceName = defGetQualifiedName(defel);
sourceOid = TSConfigGetCfgid(defGetQualifiedName(defel), false);
else
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
@ -1298,15 +1295,18 @@ DefineTSConfiguration(List *names, List *parameters)
defel->defname)));
}
if (OidIsValid(sourceOid) && OidIsValid(prsOid))
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("cannot specify both PARSER and COPY options")));
/*
* Look up source config if given.
*/
if (sourceName)
if (OidIsValid(sourceOid))
{
Form_pg_ts_config cfg;
sourceOid = TSConfigGetCfgid(sourceName, false);
tup = SearchSysCache(TSCONFIGOID,
ObjectIdGetDatum(sourceOid),
0, 0, 0);
@ -1316,9 +1316,8 @@ DefineTSConfiguration(List *names, List *parameters)
cfg = (Form_pg_ts_config) GETSTRUCT(tup);
/* Use source's parser if no other was specified */
if (!OidIsValid(prsOid))
prsOid = cfg->cfgparser;
/* use source's parser */
prsOid = cfg->cfgparser;
ReleaseSysCache(tup);
}
@ -1626,8 +1625,7 @@ void
AlterTSConfiguration(AlterTSConfigurationStmt *stmt)
{
HeapTuple tup;
HeapTuple newtup;
Relation mapRel;
Relation relMap;
/* Find the configuration */
tup = GetTSConfigTuple(stmt->cfgname);
@ -1642,84 +1640,22 @@ AlterTSConfiguration(AlterTSConfigurationStmt *stmt)
aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_TSCONFIGURATION,
NameListToString(stmt->cfgname));
/* Update fields of config tuple? */
if (stmt->options)
newtup = UpdateTSConfiguration(stmt, tup);
else
newtup = tup;
relMap = heap_open(TSConfigMapRelationId, RowExclusiveLock);
/* Add or drop mappings? */
/* Add or drop mappings */
if (stmt->dicts)
MakeConfigurationMapping(stmt, newtup);
MakeConfigurationMapping(stmt, tup, relMap);
else if (stmt->tokentype)
DropConfigurationMapping(stmt, newtup);
/*
* Even if we aren't changing mappings, there could already be some,
* so makeConfigurationDependencies always has to look.
*/
mapRel = heap_open(TSConfigMapRelationId, AccessShareLock);
DropConfigurationMapping(stmt, tup, relMap);
/* Update dependencies */
makeConfigurationDependencies(newtup, true, mapRel);
makeConfigurationDependencies(tup, true, relMap);
heap_close(mapRel, AccessShareLock);
heap_close(relMap, RowExclusiveLock);
ReleaseSysCache(tup);
}
/*
* ALTER TEXT SEARCH CONFIGURATION - update fields of pg_ts_config tuple
*/
static HeapTuple
UpdateTSConfiguration(AlterTSConfigurationStmt *stmt, HeapTuple tup)
{
Relation cfgRel;
ListCell *pl;
Datum repl_val[Natts_pg_ts_config];
char repl_null[Natts_pg_ts_config];
char repl_repl[Natts_pg_ts_config];
HeapTuple newtup;
memset(repl_val, 0, sizeof(repl_val));
memset(repl_null, ' ', sizeof(repl_null));
memset(repl_repl, ' ', sizeof(repl_repl));
cfgRel = heap_open(TSConfigRelationId, RowExclusiveLock);
foreach(pl, stmt->options)
{
DefElem *defel = (DefElem *) lfirst(pl);
if (pg_strcasecmp(defel->defname, "parser") == 0)
{
Oid newPrs;
newPrs = TSParserGetPrsid(defGetQualifiedName(defel), false);
repl_val[Anum_pg_ts_config_cfgparser - 1] = ObjectIdGetDatum(newPrs);
repl_repl[Anum_pg_ts_config_cfgparser - 1] = 'r';
}
else
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("text search configuration parameter \"%s\" not recognized",
defel->defname)));
}
newtup = heap_modifytuple(tup, RelationGetDescr(cfgRel),
repl_val, repl_null, repl_repl);
simple_heap_update(cfgRel, &newtup->t_self, newtup);
CatalogUpdateIndexes(cfgRel, newtup);
heap_close(cfgRel, RowExclusiveLock);
return newtup;
}
/*------------------- TS Configuration mapping stuff ----------------*/
/*
* Translate a list of token type names to an array of token type numbers
*/
@ -1780,10 +1716,10 @@ getTokenTypes(Oid prsId, List *tokennames)
* ALTER TEXT SEARCH CONFIGURATION ADD/ALTER MAPPING
*/
static void
MakeConfigurationMapping(AlterTSConfigurationStmt *stmt, HeapTuple tup)
MakeConfigurationMapping(AlterTSConfigurationStmt *stmt,
HeapTuple tup, Relation relMap)
{
Oid cfgId = HeapTupleGetOid(tup);
Relation relMap;
ScanKeyData skey[2];
SysScanDesc scan;
HeapTuple maptup;
@ -1801,8 +1737,6 @@ MakeConfigurationMapping(AlterTSConfigurationStmt *stmt, HeapTuple tup)
tokens = getTokenTypes(prsId, stmt->tokentype);
ntoken = list_length(stmt->tokentype);
relMap = heap_open(TSConfigMapRelationId, RowExclusiveLock);
if (stmt->override)
{
/*
@ -1938,18 +1872,16 @@ MakeConfigurationMapping(AlterTSConfigurationStmt *stmt, HeapTuple tup)
}
}
}
heap_close(relMap, RowExclusiveLock);
}
/*
* ALTER TEXT SEARCH CONFIGURATION DROP MAPPING
*/
static void
DropConfigurationMapping(AlterTSConfigurationStmt *stmt, HeapTuple tup)
DropConfigurationMapping(AlterTSConfigurationStmt *stmt,
HeapTuple tup, Relation relMap)
{
Oid cfgId = HeapTupleGetOid(tup);
Relation relMap;
ScanKeyData skey[2];
SysScanDesc scan;
HeapTuple maptup;
@ -1964,8 +1896,6 @@ DropConfigurationMapping(AlterTSConfigurationStmt *stmt, HeapTuple tup)
tokens = getTokenTypes(prsId, stmt->tokentype);
ntoken = list_length(stmt->tokentype);
relMap = heap_open(TSConfigMapRelationId, RowExclusiveLock);
i = 0;
foreach(c, stmt->tokentype)
{
@ -2011,8 +1941,6 @@ DropConfigurationMapping(AlterTSConfigurationStmt *stmt, HeapTuple tup)
i++;
}
heap_close(relMap, RowExclusiveLock);
}

11
src/backend/parser/gram.y
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@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.599 2007/08/21 15:13:42 tgl Exp $
* $PostgreSQL: pgsql/src/backend/parser/gram.y,v 2.600 2007/08/22 05:13:50 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@ -5523,14 +5523,7 @@ AlterTSDictionaryStmt:
;
AlterTSConfigurationStmt:
ALTER TEXT_P SEARCH CONFIGURATION any_name definition
{
AlterTSConfigurationStmt *n = makeNode(AlterTSConfigurationStmt);
n->cfgname = $5;
n->options = $6;
$$ = (Node *)n;
}
| ALTER TEXT_P SEARCH CONFIGURATION any_name ADD_P MAPPING FOR name_list WITH any_name_list
ALTER TEXT_P SEARCH CONFIGURATION any_name ADD_P MAPPING FOR name_list WITH any_name_list
{
AlterTSConfigurationStmt *n = makeNode(AlterTSConfigurationStmt);
n->cfgname = $5;

4
src/include/nodes/parsenodes.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.351 2007/08/21 01:11:28 tgl Exp $
* $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.352 2007/08/22 05:13:50 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -2054,10 +2054,8 @@ typedef struct AlterTSConfigurationStmt
{
NodeTag type;
List *cfgname; /* qualified name (list of Value strings) */
List *options; /* List of DefElem nodes */
/*
* These fields are used for ADD/ALTER/DROP MAPPING variants.
* dicts will be non-NIL if ADD/ALTER MAPPING was specified.
* If dicts is NIL, but tokentype isn't, DROP MAPPING was specified.
*/

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