id,node_id,number,state,locked,title,user,body,created_at,updated_at,closed_at,merged_at,merge_commit_sha,assignee,milestone,draft,head,base,author_association,repo,url,merged_by,auto_merge
1173049178,PR_kwDOCGYnMM5F609a,519,closed,0,Fixes breaking DEFAULT values,13819005,"Fixes #509, Fixes #336

Thanks for the great library!
I fixed a bug that `sqlite-utils transform` breaks DEFAULT values.
All tests already present passed  with no changes, and I added some tests for this PR.

In #509 case, fixed here.

```shell
$ sqlite3 test.db << EOF
CREATE TABLE mytable (
    col1 TEXT DEFAULT 'foo',
    col2 TEXT DEFAULT (STRFTIME('%Y-%m-%d %H:%M:%f', 'NOW'))
)
EOF

$ sqlite3 test.db ""SELECT sql FROM sqlite_master WHERE name = 'mytable';""
CREATE TABLE mytable (
    col1 TEXT DEFAULT 'foo',
    col2 TEXT DEFAULT (STRFTIME('%Y-%m-%d %H:%M:%f', 'NOW'))
)

$ sqlite3 test.db ""INSERT INTO mytable DEFAULT VALUES; SELECT * FROM mytable;""
foo|2022-12-21 01:15:39.669

$ sqlite-utils transform test.db mytable --rename col1 renamedcol1
$ sqlite3 test.db ""SELECT sql FROM sqlite_master WHERE name = 'mytable';""
CREATE TABLE ""mytable"" (
   [renamedcol1] TEXT DEFAULT 'foo',
   [col2] TEXT DEFAULT (STRFTIME('%Y-%m-%d %H:%M:%f', 'NOW'))  # ← Non-String Value
)

$ sqlite3 test.db ""INSERT INTO mytable DEFAULT VALUES; SELECT * FROM mytable;""
foo|2022-12-21 01:15:39.669
foo|2022-12-21 01:15:56.432
```

And #336 case also fixed.
Special values are described [here](https://www.sqlite.org/lang_createtable.html).

> 3.2. The DEFAULT clause
> ... A default value may also be one of the special case-independent keywords CURRENT_TIME, CURRENT_DATE or CURRENT_TIMESTAMP.

```shell
$ echo 'create table bar (baz text, created_at timestamp default CURRENT_TIMESTAMP)' | sqlite3 foo.db
$ sqlite3 foo.db
SQLite version 3.39.5 2022-10-14 20:58:05
Enter "".help"" for usage hints.
sqlite> .schema bar
CREATE TABLE bar (baz text, created_at timestamp default CURRENT_TIMESTAMP);
sqlite> .exit

$ sqlite-utils transform foo.db bar --column-order baz
$ sqlite3 foo.db
SQLite version 3.39.5 2022-10-14 20:58:05
Enter "".help"" for usage hints.
sqlite> .schema bar
CREATE TABLE IF NOT EXISTS ""bar"" (
   [baz] TEXT,
   [created_at] FLOAT DEFAULT CURRENT_TIMESTAMP
);
sqlite> .exit

$ sqlite-utils transform foo.db bar --column-order baz
$ sqlite3 foo.db
SQLite version 3.39.5 2022-10-14 20:58:05
Enter "".help"" for usage hints.
sqlite> .schema bar
CREATE TABLE IF NOT EXISTS ""bar"" (
   [baz] TEXT,
   [created_at] FLOAT DEFAULT CURRENT_TIMESTAMP  # ← Non-String Value
);
```


<!-- readthedocs-preview sqlite-utils start -->
----
:books: Documentation preview :books:: https://sqlite-utils--519.org.readthedocs.build/en/519/

<!-- readthedocs-preview sqlite-utils end -->",2022-12-21T01:27:52Z,2023-05-08T21:13:37Z,2023-05-08T21:13:37Z,2023-05-08T21:13:37Z,6500fed8b2085869b9714ce3a08c30f61dc829ad,,,0,5e5c262fab69eb3c470afa57fc52d3d7d8beee7a,fc221f9b62ed8624b1d2098e564f525c84497969,CONTRIBUTOR,140912432,https://github.com/simonw/sqlite-utils/pull/519,,