Support asserting RETURN result column names in testing framework

[yiyun-sj]

Column Name Assertion

• added new optional property to check for column names -CHECK_COLUMN_NAMES
• column names form a tuple in the first row of tuples (need to +1 tuple count)
• the same behaviour applies to csv answers and hash compare (column names treated as a tuple)
• if checking order, column names always first in result order

Example

-CHECK_COLUMN_NAMES
-STATEMENT MATCH (a:User) RETURN a.name, COUNT { MATCH (a)<-[:Follows]-(b:User) } AS num_follower ORDER BY num_follower;
---- 5
a.name|num_follower
Adam|0
Karissa|1
Noura|1
Zhang|2

[ray6080]

LGTM! Can u add a test case for this feature?

[yiyun-sj]

LGTM! Can u add a test case for this feature?

Added a test case for basic usage. Let me know if I should add tests for CSV answers and hashing as well.

[ray6080]

Add a new line here.