| From: | "nikolai(dot)berkoff" <nikolai(dot)berkoff(at)pm(dot)me> |
|---|---|
| To: | "pgsql-docs(at)lists(dot)postgresql(dot)org" <pgsql-docs(at)lists(dot)postgresql(dot)org> |
| Subject: | ALTER TABLE ... SET DATA TYPE removes statistics |
| Date: | 2021-10-08 09:03:34 |
| Message-ID: | vCc8XnwDmlP4ZnHBQLIVxzD405BiYHVC9qZlhIF7IsfxK0gC9mZ4PUUOH0-3y6kv5p-87-3_ljqT1KvQVAnb8OoWhPU3kcqWn2ZpmxRBCQg=@pm.me |
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| Lists: | pgsql-docs |
The current documentation does not mention that the column statistics are removed which I can see they are in src/backend/commands/tablecmds.c
ATExecAlterColumnType
/*
* Drop any pg_statistic entry for the column, since it's now wrong type
*/
RemoveStatistics(RelationGetRelid(rel), attnum);
Although this might be obvious it tripped me up. For example renaming and SET STATISTICS preserves statistics. Patch attached.
Regards,
Nikolai
| Attachment | Content-Type | Size |
|---|---|---|
| set_data_type.patch | text/x-patch | 907 bytes |
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