diff options
| author | Tom Lane <tgl@sss.pgh.pa.us> | 2010-10-02 18:21:41 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2010-10-02 18:22:08 -0400 |
| commit | 8178d9480aeedfa20157bb98e21b5f3b6eb8a957 (patch) | |
| tree | 46d0b6b7ba18b6c873b9a66783054327d2f93ab0 /src/backend/commands | |
| parent | a0ccae7ed41201251c0da51a91b84eb9d13c4ab1 (diff) | |
Throw an appropriate error if ALTER COLUMN TYPE finds a dependent trigger.
Actually making this case work, if the column is used in the trigger's
WHEN condition, will take some new code that probably isn't appropriate
to back-patch. For now, just throw a FEATURE_NOT_SUPPORTED error rather
than allowing control to reach the "unexpected object" case. Per bug #5688
from Daniel Grace. Back-patch to 9.0 where the possibility of such a
dependency was introduced.
Diffstat (limited to 'src/backend/commands')
| -rw-r--r-- | src/backend/commands/tablecmds.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index c4d81bb4fec..ab9c6a5191d 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -6148,6 +6148,24 @@ ATExecAlterColumnType(AlteredTableInfo *tab, Relation rel, colName))); break; + case OCLASS_TRIGGER: + /* + * A trigger can depend on a column because the column is + * specified as an update target, or because the column is + * used in the trigger's WHEN condition. The first case would + * not require any extra work, but the second case would + * require updating the WHEN expression, which will take a + * significant amount of new code. Since we can't easily tell + * which case applies, we punt for both. FIXME someday. + */ + ereport(ERROR, + (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), + errmsg("cannot alter type of a column used in a trigger definition"), + errdetail("%s depends on column \"%s\"", + getObjectDescription(&foundObject), + colName))); + break; + case OCLASS_DEFAULT: /* @@ -6168,7 +6186,6 @@ ATExecAlterColumnType(AlteredTableInfo *tab, Relation rel, case OCLASS_OPFAMILY: case OCLASS_AMOP: case OCLASS_AMPROC: - case OCLASS_TRIGGER: case OCLASS_SCHEMA: case OCLASS_TSPARSER: case OCLASS_TSDICT: |