FillNullStage

Replace nulls frame-wide with the value the expression evaluates to.

opOp (string)필수

상수 값: fill_null

exprExpr (string)필수

Polars-SQL fill value, e.g. "0" or "'unknown'"

FillNullStage

{
  "op": "fill_null",
  "expr": "string"
}