New keyword "Compare Query Results"

[amochin]

The keyword should compare results of two SQL queries and show the difference.

The arguments would be like query_1, query_2 and assert_results_equal (True or False).
If False, there is no assertion - just show print the difference in the RF log.

Both queries must deliver the same columns - same numbers and the same names.
It has to be implemented in the queries themselves.

The output should look like a merged table

• The columns are the same, they're merged (no duplicated cols like Col_A_Query_1 and Col_A_Query_2 - just Col_A).
• The cells with not equal values should get a red background and contain both values like Value 1 != Value 2.
• The column name and the row number with a cell with unequal values shall be highlighted as well.
• And maybe keep them visible during the scrolling (sticky scroll)?
• All other cells with equal values should be either not highlighted at all or get a green background maybe.

Apart from the visual highlighting, there should be an assertion to provide the keyword status and the error message

• The error message should not include all details, but maybe a number of rows and column names? Like this: X rows had differences in cols A, B and C?

The very first check though should be the comparison of row number in results

• If they are unequal, there should be an error message (without details) - and an additional visual output.
• Visually, it would be maybe nice to print both tables aside and highlight rows, which exist in one of the results only - in green and red, like git merge style?
• No further assertions are performed in this case.