The "R" language has a package called "data.frame". It has some relatively clever handling of large data that makes it fast.
Link:
Points:
- Tables are so popular that they are now built into MatLab.
- They can be considered parallel same-length structures.
- The license for the "R" library is GPL 3.0, which means it is friendlier (I'm not a lawyer) for business use and integration.
Even if you don't end up using the library, looking at how they handle data might inform how you think about data in MathScript.