In reference to G D7 = G maj scale
In reference to Em B7= E harmonic minor to be technical. Or a G maj with a raised 5th. Can also play E melodic minor, which is an Emaj scale with a b3rd. I tend to look at scales in terms of function, not as actual scales themselves. It's quicker and easier for me. All these fancy scales meld together with and in time. I tend to play whatever fragment is needed at the moment. It's easier for me to string shorter concise phrases together than one long Berlioz line. My scale days are long gone. I rarely end lines or phrases on roots, especially improvising. It's just not my cup of tea.