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Improve error message and hint for ALTER COLUMN TYPE can't-cast failure.

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We already tried to improve this once, but the "improved" text was rather
off-target if you had provided a USING clause.  Also, it seems helpful
to provide the exact text of a suggested USING clause, so users can just
copy-and-paste it when needed.  Per complaint from Keith Rarick and a
suggestion from Merlin Moncure.

Back-patch to 9.2 where the current wording was adopted.
This commit is contained in:
Tom Lane
2015-06-12 11:54:03 -04:00
parent b5fe62038f
commit b00982344a
3 changed files with 26 additions and 7 deletions
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src/test/regress/sql/alter_table.sql
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@ -1175,6 +1175,7 @@ insert into anothertab (atcol1, atcol2) values (default, false);
select * from anothertab;
alter table anothertab alter column atcol1 type boolean; -- fails
alter table anothertab alter column atcol1 type boolean using atcol1::int; -- fails
alter table anothertab alter column atcol1 type integer;
select * from anothertab;