Some potential improvements

[fruitfly1026]

• Generate the mappings in the same location with the output tensor file.
• Remove specifying the output tensor file for query.

[fruitfly1026]

@ShadenSmith I'm trying to this in another branch, then do the merge request to you~

[ShadenSmith]

Awesome! Thanks @fruitfly1026 !

[fruitfly1026]

@ShadenSmith NP~ :-P

• One more: I found the date types only support extracting member values. E.g., extracting day by lambda x: date_parser.parse(x).day. But we cannot convert to a cumulative day value by including year and month info, right? If so, I can also work on this.