Struct StrColumn 

pub struct StrColumn<'a> {
    keys: &'a UInt32Array,
    values: &'a StringArray,
}

The str column of an attribute table, read through its dictionary.

Five call sites — the block index, the zone index, the filter, the JSON encoder and the service.name scan — all want the same thing: the text of row n. The dictionary makes that two indirections instead of one, so it is resolved here rather than five times, and the column position lives in one place with it.

value on a null row reads whatever key byte is under it, exactly as StringArray::value did before. Every caller reaches it through type == AttrType::Str, which is only written alongside a value.

Fields

keys: &'a UInt32Array

values: &'a StringArray

Implementations

impl StrColumn<'_>

pub fn value(&self, row: usize) -> &str

pub fn is_valid(&self, row: usize) -> bool