NULL
values (often represented as NA
or null
) are common in datasets and need to be handled appropriately during data processing. Spark provides several functions to handle null values in DataFrames.
dropna()
: Drops rows or columns with null values.fillna()
: Fills null values with a specified value.isnull()
: Checks if a column contains null values.coalesce()
: Returns the first non-null value in a list of columns.na.drop()
: Alias for dropna()
.na.fill()
: Alias for fillna()
.coalesce()
to Handle Nullsdropna()
judiciously, as it can reduce the size of the DataFrame.fillna()
with caution, as filling nulls with arbitrary values can introduce bias.coalesce()
for efficient handling of nulls in expressions.NULL
values are common in datasets and need to be handled appropriately.dropna()
, fillna()
, and coalesce()
to handle nulls.dropna()
can reduce the size of the DataFrame.IS NULL
, COALESCE
, and CASE
statements.