diff options
Diffstat (limited to 'src/backend/commands/tablecmds.c')
| -rw-r--r-- | src/backend/commands/tablecmds.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 94fc3a082b2..70cd2669164 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -12678,6 +12678,16 @@ ATPrepAlterColumnType(List **wqueue, colName))); /* + * Cannot specify USING when altering type of a generated column, because + * that would violate the generation expression. + */ + if (attTup->attgenerated && def->cooked_default) + ereport(ERROR, + (errcode(ERRCODE_INVALID_COLUMN_DEFINITION), + errmsg("cannot specify USING when altering type of generated column"), + errdetail("Column \"%s\" is a generated column.", colName))); + + /* * Don't alter inherited columns. At outer level, there had better not be * any inherited definition; when recursing, we assume this was checked at * the parent level (see below). @@ -12753,11 +12763,12 @@ ATPrepAlterColumnType(List **wqueue, (errcode(ERRCODE_DATATYPE_MISMATCH), errmsg("column \"%s\" cannot be cast automatically to type %s", colName, format_type_be(targettype)), + !attTup->attgenerated ? /* translator: USING is SQL, don't translate it */ errhint("You might need to specify \"USING %s::%s\".", quote_identifier(colName), format_type_with_typemod(targettype, - targettypmod)))); + targettypmod)) : 0)); } /* Fix collations after all else */ |