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Allow IF NOT EXISTS when add a new enum label.

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If the label is already in the enum the statement becomes a no-op.
This will reduce the pain that comes from our not allowing this
operation inside a transaction block.

Andrew Dunstan, reviewed by Tom Lane and Magnus Hagander.
This commit is contained in:
Andrew Dunstan
2012-09-22 12:53:31 -04:00
parent 11e131854f
commit 6d12b68cd7
10 changed files with 89 additions and 14 deletions
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25
src/backend/parser/gram.y
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@ -470,7 +470,7 @@ static void processCASbits(int cas_bits, int location, const char *constrType,
%type <windef> window_definition over_clause window_specification
opt_frame_clause frame_extent frame_bound
%type <str> opt_existing_window_name
%type <boolean> opt_if_not_exists
/*
* Non-keyword token types. These are hard-wired into the "flex" lexer.
@ -4618,35 +4618,42 @@ enum_val_list: Sconst
*****************************************************************************/
AlterEnumStmt:
ALTER TYPE_P any_name ADD_P VALUE_P Sconst
ALTER TYPE_P any_name ADD_P VALUE_P opt_if_not_exists Sconst
{
AlterEnumStmt *n = makeNode(AlterEnumStmt);
n->typeName = $3;
n->newVal = $6;
n->newVal = $7;
n->newValNeighbor = NULL;
n->newValIsAfter = true;
n->skipIfExists = $6;
$$ = (Node *) n;
}
| ALTER TYPE_P any_name ADD_P VALUE_P Sconst BEFORE Sconst
| ALTER TYPE_P any_name ADD_P VALUE_P opt_if_not_exists Sconst BEFORE Sconst
{
AlterEnumStmt *n = makeNode(AlterEnumStmt);
n->typeName = $3;
n->newVal = $6;
n->newValNeighbor = $8;
n->newVal = $7;
n->newValNeighbor = $9;
n->newValIsAfter = false;
n->skipIfExists = $6;
$$ = (Node *) n;
}
| ALTER TYPE_P any_name ADD_P VALUE_P Sconst AFTER Sconst
| ALTER TYPE_P any_name ADD_P VALUE_P opt_if_not_exists Sconst AFTER Sconst
{
AlterEnumStmt *n = makeNode(AlterEnumStmt);
n->typeName = $3;
n->newVal = $6;
n->newValNeighbor = $8;
n->newVal = $7;
n->newValNeighbor = $9;
n->newValIsAfter = true;
n->skipIfExists = $6;
$$ = (Node *) n;
}
;
opt_if_not_exists: IF_P NOT EXISTS { $$ = true; }
| /* empty */ { $$ = false; }
;
/*****************************************************************************
*