>
> .filter(t1.c1=='hello', and_(t3.c1=='world')) 
>

The and_ Is wrong in this context.  Everything in `filter` is joined by 
"and" by default.  You just want: 

    .filter(t1.c1=='hello', t3.c1=='world')

`and_` is usually used in a nested condition, often under an `or_`.

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