fix(sqllab):clickhouse result no column header

[wengieeee]

SUMMARY

version : superset 1.5.0
python : 3.8
connect db：clickhouse + http（8123）

if you run any clickhouse sql with "format" keyword， returned results have no column headers，the first row of results will be the column header。

In this case, if the first column has a null value, an error will be thrown directly。

After troubleshooting, the problem lies in the referenced package clickhouse_sqlalchemy/drivers/http/connector.py:112

Therefore, the SQL with format keyword needs to add format parameters “FORMAT TabSeparatedWithNamesAndTypes” manually

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

before

after

TESTING INSTRUCTIONS

1、run any clickhouse sql with "format" keyword. like
select subtractDays(toDateTime(formatDateTime(now(),'%Y-%m-%d 00:00:00')),2) as t

ADDITIONAL INFORMATION

• Has associated issue:
  Fixes Python Issue leaks to SQL Lab when querying Clickhouse #19253
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[save-my-heart]

I think it is not necessary to rewrite query in superset. Instead, fix it in clickhouse_sqlalchemy.
See: xzkostyan/clickhouse-sqlalchemy#180

[phpsxg]

Why clickhouse result no column header when using formatDateTime function,Thanks~

[villebro]

Superseded by #21195, closing