Description of problem:
Incorrect results when executing simple SELECT queries

Version-Release number of selected component (if applicable):
6.3.6

How reproducible:
Use any deployed VDB and execute the following select statements

Steps to Reproduce:
1. Use any deployed VDB
2. Connect using JDBC client i.e. SQuirrelSQL
3. Run following query
3a. SELECT not(false)
3b. SELECT * FROM <model> where 1 = 1

Actual results 3a:
3a. SELECT not(false)
1st attempt returns true
2nd attempt returns false

Actual results 3b:
no rows returned

Expected results:

3a. true all the time
3b. all rows should be returned since 1 is equal to 1 = true

Additional info:
Tested it in 6.4 ER1 and seems to be fixed in this release.