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Allow new values to be added to an existing enum type.

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After much expenditure of effort, we've got this to the point where the
performance penalty is pretty minimal in typical cases.

Andrew Dunstan, reviewed by Brendan Jurd, Dean Rasheed, and Tom Lane
This commit is contained in:
Tom Lane
2010-10-24 23:04:37 -04:00
parent 24b29ca8f9
commit 84c123be1d
23 changed files with 1422 additions and 170 deletions
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41
src/backend/parser/gram.y
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@@ -182,8 +182,8 @@ static RangeVar *makeRangeVarFromAnyName(List *names, int position, core_yyscan_
}
%type <node> stmt schema_stmt
AlterDatabaseStmt AlterDatabaseSetStmt AlterDomainStmt AlterFdwStmt
AlterForeignServerStmt AlterGroupStmt
AlterDatabaseStmt AlterDatabaseSetStmt AlterDomainStmt AlterEnumStmt
AlterFdwStmt AlterForeignServerStmt AlterGroupStmt
AlterObjectSchemaStmt AlterOwnerStmt AlterSeqStmt AlterTableStmt
AlterCompositeTypeStmt AlterUserStmt AlterUserMappingStmt AlterUserSetStmt
AlterRoleStmt AlterRoleSetStmt
@@ -652,6 +652,7 @@ stmt :
| AlterDatabaseSetStmt
| AlterDefaultPrivilegesStmt
| AlterDomainStmt
| AlterEnumStmt
| AlterFdwStmt
| AlterForeignServerStmt
| AlterFunctionStmt
@@ -3863,6 +3864,42 @@ enum_val_list: Sconst
{ $$ = lappend($1, makeString($3)); }
;
/*****************************************************************************
*
* ALTER TYPE enumtype ADD ...
*
*****************************************************************************/
AlterEnumStmt:
ALTER TYPE_P any_name ADD_P Sconst
{
AlterEnumStmt *n = makeNode(AlterEnumStmt);
n->typeName = $3;
n->newVal = $5;
n->newValNeighbor = NULL;
n->newValIsAfter = true;
$$ = (Node *) n;
}
| ALTER TYPE_P any_name ADD_P Sconst BEFORE Sconst
{
AlterEnumStmt *n = makeNode(AlterEnumStmt);
n->typeName = $3;
n->newVal = $5;
n->newValNeighbor = $7;
n->newValIsAfter = false;
$$ = (Node *) n;
}
| ALTER TYPE_P any_name ADD_P Sconst AFTER Sconst
{
AlterEnumStmt *n = makeNode(AlterEnumStmt);
n->typeName = $3;
n->newVal = $5;
n->newValNeighbor = $7;
n->newValIsAfter = true;
$$ = (Node *) n;
}
;
/*****************************************************************************
*