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10 minutes Quickstart
Daft User Guide
Basic Concepts
Reading/Writing Data
Expressions
Datatypes
DataFrame Operations
SQL
Aggregations and Grouping
User-Defined Functions (UDF)
The Daft Poweruser
Managing Memory Usage
Partitioning
Distributed Computing
Integrations
Ray
Unity Catalog
Apache Iceberg
Delta Lake
Apache Hudi
Microsoft Azure
Amazon Web Services
SQL
Huggingface Datasets
Tutorials
Feature of the Week
#000 - Data Access
Multimodal 101: Images
API Documentation
Table of Contents
Dataframe Creation
daft.from_pylist
daft.from_pydict
daft.from_arrow
daft.from_pandas
daft.read_parquet
daft.read_csv
daft.read_json
daft.from_glob_path
daft.read_iceberg
daft.read_deltalake
daft.read_hudi
daft.from_ray_dataset
daft.from_dask_dataframe
daft.read_sql
daft.read_lance
DataFrame
daft.DataFrame
daft.DataFrame.__getitem__
daft.DataFrame.select
daft.DataFrame.with_column
daft.DataFrame.with_columns
daft.DataFrame.pivot
daft.DataFrame.exclude
daft.DataFrame.explode
daft.DataFrame.unpivot
daft.DataFrame.melt
daft.DataFrame.transform
daft.DataFrame.distinct
daft.DataFrame.filter
daft.DataFrame.where
daft.DataFrame.limit
daft.DataFrame.sample
daft.DataFrame.sort
daft.DataFrame.repartition
daft.DataFrame.into_partitions
daft.DataFrame.join
daft.DataFrame.concat
daft.DataFrame.groupby
daft.DataFrame.sum
daft.DataFrame.mean
daft.DataFrame.stddev
daft.DataFrame.count
daft.DataFrame.min
daft.DataFrame.max
daft.DataFrame.agg
daft.DataFrame.to_pydict
daft.DataFrame.to_pylist
daft.DataFrame.iter_partitions
daft.DataFrame.iter_rows
daft.DataFrame.collect
daft.DataFrame.show
daft.DataFrame.write_parquet
daft.DataFrame.write_csv
daft.DataFrame.write_iceberg
daft.DataFrame.write_deltalake
daft.DataFrame.to_arrow
daft.DataFrame.to_pandas
daft.DataFrame.to_torch_map_dataset
daft.DataFrame.to_torch_iter_dataset
daft.DataFrame.to_ray_dataset
daft.DataFrame.to_dask_dataframe
daft.DataFrame.explain
daft.DataFrame.schema
daft.DataFrame.column_names
SQL
AzureConfig
GCSConfig
HTTPConfig
S3Config
abs
acos
acosh
array_to_string
asin
asinh
atan
atan2
atanh
avg
capitalize
ceil
clip
coalesce
concat
contains
cos
cot
count
count_matches
date
day
dayofweek
degrees
ends_with
exp
explode
fill_nan
find
floor
hash
hour
image_crop
image_decode
image_encode
image_resize
image_to_mode
is_inf
is_nan
json_query
left
length
length_bytes
list_chunk
list_count
list_join
list_max
list_mean
list_min
list_slice
list_sort
list_sum
ln
log
log10
log2
lower
lpad
lstrip
map_extract
map_get
max
mean
min
minhash
minute
month
normalize
not_nan
partitioning_days
partitioning_hours
partitioning_iceberg_bucket
partitioning_iceberg_truncate
partitioning_months
partitioning_years
radians
regexp_extract
regexp_extract_all
regexp_match
regexp_replace
regexp_split
repeat
reverse
right
round
rpad
rstrip
second
sign
sin
split
sqrt
starts_with
stddev
stddev_samp
struct_extract
struct_get
sum
tan
time
to_date
to_datetime
tokenize_decode
tokenize_encode
unnest
upper
year
Expressions
daft.col
daft.lit
daft.to_struct
daft.Expression.alias
daft.Expression.cast
daft.Expression.if_else
daft.Expression.is_null
daft.Expression.not_null
daft.Expression.fill_null
daft.Expression.hash
daft.Expression.apply
daft.Expression.__abs__
daft.Expression.__add__
daft.Expression.__sub__
daft.Expression.__mul__
daft.Expression.__truediv__
daft.Expression.__mod__
daft.Expression.__lshift__
daft.Expression.__rshift__
daft.Expression.ceil
daft.Expression.floor
daft.Expression.sign
daft.Expression.round
daft.Expression.clip
daft.Expression.sqrt
daft.Expression.cbrt
daft.Expression.sin
daft.Expression.cos
daft.Expression.tan
daft.Expression.cot
daft.Expression.arcsin
daft.Expression.arccos
daft.Expression.arctan
daft.Expression.arctan2
daft.Expression.arctanh
daft.Expression.arccosh
daft.Expression.arcsinh
daft.Expression.radians
daft.Expression.degrees
daft.Expression.log2
daft.Expression.log10
daft.Expression.log
daft.Expression.ln
daft.Expression.exp
daft.Expression.shift_left
daft.Expression.shift_right
daft.Expression.__invert__
daft.Expression.__and__
daft.Expression.__or__
daft.Expression.__lt__
daft.Expression.__le__
daft.Expression.__eq__
daft.Expression.__ne__
daft.Expression.__gt__
daft.Expression.__ge__
daft.Expression.between
daft.Expression.is_in
daft.Expression.minhash
daft.Expression.count
daft.Expression.sum
daft.Expression.mean
daft.Expression.stddev
daft.Expression.min
daft.Expression.max
daft.Expression.any_value
daft.Expression.agg_list
daft.Expression.agg_concat
daft.Expression.approx_percentiles
daft.Expression.approx_count_distinct
daft.Expression.str.contains
daft.Expression.str.match
daft.Expression.str.startswith
daft.Expression.str.endswith
daft.Expression.str.concat
daft.Expression.str.split
daft.Expression.str.extract
daft.Expression.str.extract_all
daft.Expression.str.replace
daft.Expression.str.length
daft.Expression.str.length_bytes
daft.Expression.str.lower
daft.Expression.str.upper
daft.Expression.str.lstrip
daft.Expression.str.rstrip
daft.Expression.str.reverse
daft.Expression.str.capitalize
daft.Expression.str.left
daft.Expression.str.right
daft.Expression.str.find
daft.Expression.str.rpad
daft.Expression.str.lpad
daft.Expression.str.repeat
daft.Expression.str.like
daft.Expression.str.ilike
daft.Expression.str.substr
daft.Expression.str.to_date
daft.Expression.str.to_datetime
daft.Expression.str.normalize
daft.Expression.str.tokenize_encode
daft.Expression.str.tokenize_decode
daft.Expression.str.count_matches
daft.Expression.float.is_inf
daft.Expression.float.is_nan
daft.Expression.float.not_nan
daft.Expression.float.fill_nan
daft.Expression.dt.date
daft.Expression.dt.hour
daft.Expression.dt.minute
daft.Expression.dt.second
daft.Expression.dt.time
daft.Expression.dt.day
daft.Expression.dt.month
daft.Expression.dt.year
daft.Expression.dt.day_of_week
daft.Expression.dt.truncate
daft.Expression.list.chunk
daft.Expression.list.count
daft.Expression.list.get
daft.Expression.list.join
daft.Expression.list.length
daft.Expression.list.max
daft.Expression.list.mean
daft.Expression.list.min
daft.Expression.list.slice
daft.Expression.list.sort
daft.Expression.list.sum
daft.Expression.list.value_counts
daft.Expression.struct.get
daft.Expression.map.get
daft.Expression.image.decode
daft.Expression.image.encode
daft.Expression.image.resize
daft.Expression.image.crop
daft.Expression.image.to_mode
daft.Expression.partitioning.days
daft.Expression.partitioning.hours
daft.Expression.partitioning.months
daft.Expression.partitioning.years
daft.Expression.partitioning.iceberg_bucket
daft.Expression.partitioning.iceberg_truncate
daft.Expression.url.download
daft.Expression.json.query
daft.Expression.embedding.cosine_distance
Schema
DataTypes
GroupBy
User Defined Functions (UDFs)
Series
Configuration
daft.context.set_runner_py
daft.context.set_runner_ray
daft.set_planning_config
daft.planning_config_ctx
daft.set_execution_config
daft.execution_config_ctx
daft.io.IOConfig
daft.io.S3Config
daft.io.S3Credentials
daft.io.GCSConfig
daft.io.AzureConfig
Miscellaneous
daft.ImageMode
daft.ImageFormat
Migration Guides
Dask Migration Guide
FAQs
Telemetry
Dataframe Comparison
Technical Architecture
Benchmarks
Release Notes
.rst
.pdf
length
Contents
length()
length
#
length
(
string_input
)
[source]
#
Returns the length of the string
Contents
length()
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