lib/polars/lazy_frame.rb in polars-df-0.1.3 vs lib/polars/lazy_frame.rb in polars-df-0.1.4

@@ -556,11 +556,11 @@
     #       "foo" => [1, 2, 3],
     #       "bar" => [6, 7, 8],
     #       "ham" => ["a", "b", "c"]
     #     }
     #   ).lazy
-    #   lf.filter(Polars.col("foo") < 3).collect()
+    #   lf.filter(Polars.col("foo") < 3).collect
     #   # =>
     #   # shape: (2, 3)
     #   # ┌─────┬─────┬─────┐
     #   # │ foo ┆ bar ┆ ham │
     #   # │ --- ┆ --- ┆ --- │
@@ -908,11 +908,11 @@
     #   ).lazy
     #   ldf.with_columns(
     #     [
     #       (Polars.col("a") ** 2).alias("a^2"),
     #       (Polars.col("b") / 2).alias("b/2"),
-    #       (Polars.col("c").is_not()).alias("not c")
+    #       (Polars.col("c").is_not).alias("not c")
     #     ]
     #   ).collect
     #   # =>
     #   # shape: (4, 6)
     #   # ┌─────┬──────┬───────┬──────┬──────┬───────┐
@@ -1254,11 +1254,15 @@
     #   # └─────┴─────┘
     def take_every(n)
       select(Utils.col("*").take_every(n))
     end
 
-    # def fill_null
-    # end
+    # Fill null values using the specified value or strategy.
+    #
+    # @return [LazyFrame]
+    def fill_null(value = nil, strategy: nil, limit: nil, matches_supertype: nil)
+      select(Polars.all.fill_null(value, strategy: strategy, limit: limit))
+    end
 
     # Fill floating point NaN values.
     #
     # @param fill_value [Object]
     #   Value to fill the NaN values with.