Fix string.contains tests II-12244, II-12245, II-12500

[hab6]

Summary

Change of formula in Actian dialect CONTAINS function fixes failures for several string.contains test cases.

Jira Ticket	Test Cases	Before Fix	After Fix
II-12244	CONTAINS([str1], Null) CONTAINS([str2], Null)	FAIL	PASS
II-12245	CONTAINS(str2, "A(") CONTAINS(str2, "A(")	FAIL	PASS
II-12500	CONTAINS(str2, "e") CONTAINS(str1, "IND")	FAIL	PASS

Full TDVT Suite Test Results

Tests	Before Fix	After Fix
Pass	850	854
Fail	20	14
Total	868	868

test_results_combined-BASELINE000.csv test_results_combined-BEFOREFIX.csv test_results_combined-AFTERFIX.csv

Update

I mistakenly left issue II-12500 off the initial post of this PR even though the issue was in fact also fixed by this PR.

There are now 3 CSV results files attached above.

• test_results_combined-BASELINE000.csv - Initial baseline TDVT run in which all 6 listed test cases failed.
• test_results_combined-BEFOREFIX.csv - Later TDVT run in which 2 of 6 test cases passed and 4 of 6 failed.
• test_results_combined-AFTERFIX.csv - Final TDVT run in which all 6 passed.