fix 1250, add editor support for datafusion cli with validation

[jimexist]

Which issue does this PR close?

Closes #1250

Rationale for this change

What changes are included in this PR?

correct sql input

❯ select cos(2.0);
+------------------------------+
| Float64(-0.4161468365471424) |
+------------------------------+
| -0.4161468365471424          |
+------------------------------+
1 row in set. Query took 0.004 seconds.

invalid SQL

❯ from a join b select 9;  🤔 Invalid statement: sql parser error: Expected an SQL statement, found: from

correct command input

❯ \d
+---------------+--------------------+------------+------------+
| table_catalog | table_schema       | table_name | table_type |
+---------------+--------------------+------------+------------+
| datafusion    | information_schema | tables     | VIEW       |
| datafusion    | information_schema | columns    | VIEW       |
+---------------+--------------------+------------+------------+
2 rows in set. Query took 0.004 seconds.

empty statement

❯ ;  🤔 You entered an empty statement

multiple statement

❯ select 1; select 2;  🤔 You entered more than one statement

multiline editing

❯ select
1



+

2



;
+----------+
| Int64(3) |
+----------+
| 3        |
+----------+
1 row in set. Query took 0.002 seconds.

edge case with comment

❯ -- select 1;  🤔 You entered an empty statement

❯ select -- 1
2


;
+----------+
| Int64(2) |
+----------+
| 2        |
+----------+
1 row in set. Query took 0.001 seconds.

❯


select ';     '









;
+----------------+
| Utf8(";     ") |
+----------------+
| ;              |
+----------------+
1 row in set. Query took 0.001 seconds.

❯ select -- select
-- select
-- --
1;
+----------+
| Int64(1) |
+----------+
| 1        |
+----------+
1 row in set. Query took 0.001 seconds.

Are there any user-facing changes?

[alamb]

I started playing around with this locally -- it is very cool. Going to review it now more carefully

[alamb]

I read the code and played around with this and it was very cool 👍

Can't wait to see something like SQL autocompletion 😍

I wonder if it would be possible to write tests for this somehow -- not because it doesn't work now, but this is the kind of cool behavior that could easily get messed up if/ when we add new behaviors / auto complete

[jimexist]

I read the code and played around with this and it was very cool 👍

Can't wait to see something like SQL autocompletion 😍

I wonder if it would be possible to write tests for this somehow -- not because it doesn't work now, but this is the kind of cool behavior that could easily get messed up if/ when we add new behaviors / auto complete

agreed, however i cannot find easy way to unit test the editor as this requires user input simulation. will try later if i have more time.