Function decode_int_column_body 

pub fn decode_int_column_body(
    tag: u8,
    buf: &[u8],
    pos: &mut usize,
    max_elements: usize,
    depth: u32,
) -> Option<Vec<i64>>

Decode one int column whose tag byte has already been read as tag. The inverse of emit_best_int_column; returns None for a non-int tag or a corrupt/hostile body. max_elements caps generator expansion; depth bounds the periodic-block recursion.