Asking (2) because IIUC this is a metadata operation that could be zero copy but I am not sure if this is actually the case.
On Wed, Feb 15, 2023 at 10:17 AM Li Jin <ice.xell...@gmail.com> wrote: > Hello! > > I have some questions about type casting memory usage with pyarrow Table. > Let's say I have a pyarrow Table with 100 columns. > > (1) if I want to cast n columns to a different type (e.g., float to int). > What is the smallest memory overhead that I can do? (memory overhead of 1 > column, n columns or 100 columns?) > > (2) if I want to cast n timestamp columns from tz-native to tz-UTC. What > is the smallest memory overhead that I can do? (0, 1 column, n columns or > 100 columns?) > > Thanks! > Li >
