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Add IF NOT EXISTS processing to ALTER TABLE ADD COLUMN

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Fabrízio de Royes Mello, reviewed by Payal Singh, Alvaro Herrera and
Michael Paquier.
This commit is contained in:
Andrew Dunstan
2015-07-29 21:30:00 -04:00
parent 632cd9f892
commit 2cd40adb85
5 changed files with 182 additions and 18 deletions
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20
src/backend/parser/gram.y
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@ -1942,6 +1942,16 @@ alter_table_cmd:
AlterTableCmd *n = makeNode(AlterTableCmd);
n->subtype = AT_AddColumn;
n->def = $2;
n->missing_ok = false;
$$ = (Node *)n;
}
/* ALTER TABLE <name> ADD IF NOT EXISTS <coldef> */
| ADD_P IF_P NOT EXISTS columnDef
{
AlterTableCmd *n = makeNode(AlterTableCmd);
n->subtype = AT_AddColumn;
n->def = $5;
n->missing_ok = true;
$$ = (Node *)n;
}
/* ALTER TABLE <name> ADD COLUMN <coldef> */
@ -1950,6 +1960,16 @@ alter_table_cmd:
AlterTableCmd *n = makeNode(AlterTableCmd);
n->subtype = AT_AddColumn;
n->def = $3;
n->missing_ok = false;
$$ = (Node *)n;
}
/* ALTER TABLE <name> ADD COLUMN IF NOT EXISTS <coldef> */
| ADD_P COLUMN IF_P NOT EXISTS columnDef
{
AlterTableCmd *n = makeNode(AlterTableCmd);
n->subtype = AT_AddColumn;
n->def = $6;
n->missing_ok = true;
$$ = (Node *)n;
}
/* ALTER TABLE <name> ALTER [COLUMN] <colname> {SET DEFAULT <expr>|DROP DEFAULT} */