How does the structure of a table get affected by an op?

[anjakefala]

• How do you add a column?
• How do you add a child table?
• How do you replace the entire table?

e.g. will replace the table (rankin=1.5, rankout=0)

!literal>feigenbaum
 4.66920
 !!python
 from aipl import defop
 from aipl.table import Table
 @defop('test', 1.5, 0)
 def testtest(aipl, t:Table) -> str:
     return '42'

 !test

e.g. will add a column (rankin=0, rankout=0)

!literal>feigenbaum
 4.66920
 !!python
 from aipl import defop
 from aipl.table import Table
 @defop('test', 0, 0)
 def testtest(aipl, t:Table) -> str:
     return '42'

 !test