"1=2" means a join condition which aways evaluates to false.
For an inner join this results in an empty set, but here it's a combination of both tables similar to a UNION:
t1: colB,colB,colC
t2: colD,colE,colF
result:
colB,colB,colC,null,null,null
null,null,null,colD,colE,colF
The query you posted is not valid syntax, so just show the actual source code.
Dieter
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