pub fn flash_fill(cx: &mut Ctx<'_>, sheet: usize, at: CellRef) -> Result<usize>Expand description
Flash Fill: learns a transformation from the examples typed in the column of at (rows
above it with values) from the column(s) to the left, and fills the remaining rows.
Supported transformations: a token (word) of the source by index, concatenations of tokens
with literal separators, upper/lower/proper case, and fixed-position substrings.