Patch ideas submission

[stonebig]

Hi Greg,

Over my patch #15 concerning "bind variable" (or sql parameters), I have several ideas of follow-up patches :

1. "sql normalization" (in advance)
   optional sql parameter notation (":" prefix, ":a_dataframe") for tables to upload to sql,
2. "we can query native sql tables"
   sql tables can have been created by previous sql requests,
   so keep "table not found" message only if a table name has the ":" prefix notation,
3. "accept several sql orders"
   result is feeded with the last sql instruction that gave a query result,
4. "uploaded tables don't overtstep sql native tables"
   tables uploaded from python space tables are created with a dedicated prefix, like "tmp",
   tables uploaded from python space are removed at the end of the sql orders.

Are you favorable for any of those 4 (+ #15) ideas ?