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Add transforms feature

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This provides a mechanism for specifying conversions between SQL data
types and procedural languages.  As examples, there are transforms
for hstore and ltree for PL/Perl and PL/Python.

reviews by Pavel Stěhule and Andres Freund
This commit is contained in:
Peter Eisentraut
2015-04-26 10:33:14 -04:00
parent f320cbb615
commit cac7658205
101 changed files with 6034 additions and 2811 deletions
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90
src/backend/parser/gram.y
View File

@@ -241,12 +241,13 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
CreateOpFamilyStmt AlterOpFamilyStmt CreatePLangStmt
CreateSchemaStmt CreateSeqStmt CreateStmt CreateTableSpaceStmt
CreateFdwStmt CreateForeignServerStmt CreateForeignTableStmt
CreateAssertStmt CreateTrigStmt CreateEventTrigStmt
CreateAssertStmt CreateTransformStmt CreateTrigStmt CreateEventTrigStmt
CreateUserStmt CreateUserMappingStmt CreateRoleStmt CreatePolicyStmt
CreatedbStmt DeclareCursorStmt DefineStmt DeleteStmt DiscardStmt DoStmt
DropGroupStmt DropOpClassStmt DropOpFamilyStmt DropPLangStmt DropStmt
DropAssertStmt DropTrigStmt DropRuleStmt DropCastStmt DropRoleStmt
DropPolicyStmt DropUserStmt DropdbStmt DropTableSpaceStmt DropFdwStmt
DropTransformStmt
DropForeignServerStmt DropUserMappingStmt ExplainStmt FetchStmt
GrantStmt GrantRoleStmt ImportForeignSchemaStmt IndexStmt InsertStmt
ListenStmt LoadStmt LockStmt NotifyStmt ExplainableStmt PreparableStmt
@@ -366,6 +367,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
opt_enum_val_list enum_val_list table_func_column_list
create_generic_options alter_generic_options
relation_expr_list dostmt_opt_list
transform_element_list transform_type_list
%type <list> opt_fdw_options fdw_options
%type <defelt> fdw_option
@@ -611,12 +613,12 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
SAVEPOINT SCHEMA SCROLL SEARCH SECOND_P SECURITY SELECT SEQUENCE SEQUENCES
SERIALIZABLE SERVER SESSION SESSION_USER SET SETOF SHARE
SHOW SIMILAR SIMPLE SKIP SMALLINT SNAPSHOT SOME STABLE STANDALONE_P START
SHOW SIMILAR SIMPLE SKIP SMALLINT SNAPSHOT SOME SQL_P STABLE STANDALONE_P START
STATEMENT STATISTICS STDIN STDOUT STORAGE STRICT_P STRIP_P SUBSTRING
SYMMETRIC SYSID SYSTEM_P
TABLE TABLES TABLESPACE TEMP TEMPLATE TEMPORARY TEXT_P THEN TIME TIMESTAMP
TO TRAILING TRANSACTION TREAT TRIGGER TRIM TRUE_P
TO TRAILING TRANSACTION TRANSFORM TREAT TRIGGER TRIM TRUE_P
TRUNCATE TRUSTED TYPE_P TYPES_P
UNBOUNDED UNCOMMITTED UNENCRYPTED UNION UNIQUE UNKNOWN UNLISTEN UNLOGGED
@@ -790,6 +792,7 @@ stmt :
| CreateSeqStmt
| CreateStmt
| CreateTableSpaceStmt
| CreateTransformStmt
| CreateTrigStmt
| CreateEventTrigStmt
| CreateRoleStmt
@@ -815,6 +818,7 @@ stmt :
| DropRuleStmt
| DropStmt
| DropTableSpaceStmt
| DropTransformStmt
| DropTrigStmt
| DropRoleStmt
| DropUserStmt
@@ -4083,6 +4087,16 @@ AlterExtensionContentsStmt:
n->objname = list_make1(makeString($6));
$$ = (Node *)n;
}
| ALTER EXTENSION name add_drop TRANSFORM FOR Typename LANGUAGE name
{
AlterExtensionContentsStmt *n = makeNode(AlterExtensionContentsStmt);
n->extname = $3;
n->action = $4;
n->objtype = OBJECT_TRANSFORM;
n->objname = list_make1($7);
n->objargs = list_make1($9);
$$ = (Node *)n;
}
| ALTER EXTENSION name add_drop TYPE_P Typename
{
AlterExtensionContentsStmt *n = makeNode(AlterExtensionContentsStmt);
@@ -5736,6 +5750,15 @@ CommentStmt:
n->comment = $6;
$$ = (Node *) n;
}
| COMMENT ON TRANSFORM FOR Typename LANGUAGE name IS comment_text
{
CommentStmt *n = makeNode(CommentStmt);
n->objtype = OBJECT_TRANSFORM;
n->objname = list_make1($5);
n->objargs = list_make1($7);
n->comment = $9;
$$ = (Node *) n;
}
| COMMENT ON TRIGGER name ON any_name IS comment_text
{
CommentStmt *n = makeNode(CommentStmt);
@@ -7015,6 +7038,10 @@ createfunc_opt_item:
{
$$ = makeDefElem("language", (Node *)makeString($2));
}
| TRANSFORM transform_type_list
{
$$ = makeDefElem("transform", (Node *)$2);
}
| WINDOW
{
$$ = makeDefElem("window", (Node *)makeInteger(TRUE));
@@ -7032,6 +7059,11 @@ func_as: Sconst { $$ = list_make1(makeString($1)); }
}
;
transform_type_list:
FOR TYPE_P Typename { $$ = list_make1($3); }
| transform_type_list ',' FOR TYPE_P Typename { $$ = lappend($1, $5); }
;
opt_definition:
WITH definition { $$ = $2; }
| /*EMPTY*/ { $$ = NIL; }
@@ -7297,6 +7329,56 @@ opt_if_exists: IF_P EXISTS { $$ = TRUE; }
;
/*****************************************************************************
*
* CREATE TRANSFORM / DROP TRANSFORM
*
*****************************************************************************/
CreateTransformStmt: CREATE opt_or_replace TRANSFORM FOR Typename LANGUAGE name '(' transform_element_list ')'
{
CreateTransformStmt *n = makeNode(CreateTransformStmt);
n->replace = $2;
n->type_name = $5;
n->lang = $7;
n->fromsql = linitial($9);
n->tosql = lsecond($9);
$$ = (Node *)n;
}
;
transform_element_list: FROM SQL_P WITH FUNCTION function_with_argtypes ',' TO SQL_P WITH FUNCTION function_with_argtypes
{
$$ = list_make2($5, $11);
}
| TO SQL_P WITH FUNCTION function_with_argtypes ',' FROM SQL_P WITH FUNCTION function_with_argtypes
{
$$ = list_make2($11, $5);
}
| FROM SQL_P WITH FUNCTION function_with_argtypes
{
$$ = list_make2($5, NULL);
}
| TO SQL_P WITH FUNCTION function_with_argtypes
{
$$ = list_make2(NULL, $5);
}
;
DropTransformStmt: DROP TRANSFORM opt_if_exists FOR Typename LANGUAGE name opt_drop_behavior
{
DropStmt *n = makeNode(DropStmt);
n->removeType = OBJECT_TRANSFORM;
n->objects = list_make1(list_make1($5));
n->arguments = list_make1(list_make1($7));
n->behavior = $8;
n->missing_ok = $3;
$$ = (Node *)n;
}
;
/*****************************************************************************
*
* QUERY:
@@ -13460,6 +13542,7 @@ unreserved_keyword:
| SIMPLE
| SKIP
| SNAPSHOT
| SQL_P
| STABLE
| STANDALONE_P
| START
@@ -13479,6 +13562,7 @@ unreserved_keyword:
| TEMPORARY
| TEXT_P
| TRANSACTION
| TRANSFORM
| TRIGGER
| TRUNCATE
| TRUSTED