feefladder commented on issue #31458:
URL: https://github.com/apache/arrow/issues/31458#issuecomment-1488780632
Ok, I think this is also quite a basic question I have that could use some
documentation:
I have a table with a schema, say
```
import {makeTable} from "apache-arrow"
const table = makeTable({
name: ["Alice", "Bob"],
otherColumn: [1, 2]
})
```
Now, I want to generate a new table, based on some kind of function, like:
```
function isBob(name: string): boolean{
return name === "Bob"
}
```
which would give the table
```
const table = makeTable({
name: [false, true]
otherColumn: [1, 2]
})
```
How would I do this? (there is a schema change, UTF-8 => boolean), so do I
then define a schema? convert the table to arrays, then change the array, then
go back to array? Can I create a table like:
```
Table( new Schema([new Field("name", Bool), table.schema.otherColumn],
table.getChild("otherColumn"))
```
where the "name" is initialize to `null`, or otherwise, I could also create
a vector?
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