Compute Functions

Aggregations

all(array, /, *[, skip_nulls, min_count, ...])	Test whether all elements in a boolean array evaluate to true.
any(array, /, *[, skip_nulls, min_count, ...])	Test whether any element in a boolean array evaluates to true.
approximate_median(array, /, *[, ...])	Approximate median of a numeric array with T-Digest algorithm.
count(array, /[, mode, options, memory_pool])	Count the number of null / non-null values.
count_distinct(array, /[, mode, options, ...])	Count the number of unique values.
index(data, value[, start, end, memory_pool])	Find the index of the first occurrence of a given value.
max(array, /, *[, skip_nulls, min_count, ...])	Compute the minimum or maximum values of a numeric array.
mean(array, /, *[, skip_nulls, min_count, ...])	Compute the mean of a numeric array.
min(array, /, *[, skip_nulls, min_count, ...])	Compute the minimum or maximum values of a numeric array.
min_max(array, /, *[, skip_nulls, ...])	Compute the minimum and maximum values of a numeric array.
mode(array, /[, n, skip_nulls, min_count, ...])	Compute the modal (most common) values of a numeric array.
product(array, /, *[, skip_nulls, ...])	Compute the product of values in a numeric array.
quantile(array, /[, q, interpolation, ...])	Compute an array of quantiles of a numeric array or chunked array.
stddev(array, /, *[, ddof, skip_nulls, ...])	Calculate the standard deviation of a numeric array.
sum(array, /, *[, skip_nulls, min_count, ...])	Compute the sum of a numeric array.
tdigest(array, /[, q, delta, buffer_size, ...])	Approximate quantiles of a numeric array with T-Digest algorithm.
variance(array, /, *[, ddof, skip_nulls, ...])	Calculate the variance of a numeric array.

Arithmetic Functions

By default these functions do not detect overflow. Most functions are also available in an overflow-checking variant, suffixed _checked, which throws an ArrowInvalid exception when overflow is detected.

abs(x, /, *[, memory_pool])	Calculate the absolute value of the argument element-wise.
abs_checked(x, /, *[, memory_pool])	Calculate the absolute value of the argument element-wise.
add(x, y, /, *[, memory_pool])	Add the arguments element-wise.
add_checked(x, y, /, *[, memory_pool])	Add the arguments element-wise.
divide(dividend, divisor, /, *[, memory_pool])	Divide the arguments element-wise.
divide_checked(dividend, divisor, /, *[, ...])	Divide the arguments element-wise.
multiply(x, y, /, *[, memory_pool])	Multiply the arguments element-wise.
multiply_checked(x, y, /, *[, memory_pool])	Multiply the arguments element-wise.
negate(x, /, *[, memory_pool])	Negate the argument element-wise.
negate_checked(x, /, *[, memory_pool])	Negate the arguments element-wise.
power(base, exponent, /, *[, memory_pool])	Raise arguments to power element-wise.
power_checked(base, exponent, /, *[, ...])	Raise arguments to power element-wise.
sign(x, /, *[, memory_pool])	Get the signedness of the arguments element-wise.
subtract(x, y, /, *[, memory_pool])	Subtract the arguments element-wise.
subtract_checked(x, y, /, *[, memory_pool])	Subtract the arguments element-wise.

Bit-wise Functions

bit_wise_and(x, y, /, *[, memory_pool])	Bit-wise AND the arguments element-wise.
bit_wise_not(x, /, *[, memory_pool])	Bit-wise negate the arguments element-wise.
bit_wise_or(x, y, /, *[, memory_pool])	Bit-wise OR the arguments element-wise.
bit_wise_xor(x, y, /, *[, memory_pool])	Bit-wise XOR the arguments element-wise.
shift_left(x, y, /, *[, memory_pool])	Left shift x by y.
shift_left_checked(x, y, /, *[, memory_pool])	Left shift x by y.
shift_right(x, y, /, *[, memory_pool])	Right shift x by y.
shift_right_checked(x, y, /, *[, memory_pool])	Right shift x by y.

Rounding Functions

Rounding functions displace numeric inputs to an approximate value with a simpler representation based on the rounding criterion.

ceil(x, /, *[, memory_pool])	Round up to the nearest integer.
floor(x, /, *[, memory_pool])	Round down to the nearest integer.
round(x, /[, ndigits, round_mode, options, ...])	Round to a given precision.
round_to_multiple(x, /[, multiple, ...])	Round to a given multiple.
trunc(x, /, *[, memory_pool])	Compute the integral part.

Logarithmic Functions

Logarithmic functions are also supported, and also offer _checked variants which detect domain errors.

ln(x, /, *[, memory_pool])	Compute natural logarithm.
ln_checked(x, /, *[, memory_pool])	Compute natural logarithm.
log10(x, /, *[, memory_pool])	Compute base 10 logarithm.
log10_checked(x, /, *[, memory_pool])	Compute base 10 logarithm.
log1p(x, /, *[, memory_pool])	Compute natural log of (1+x).
log1p_checked(x, /, *[, memory_pool])	Compute natural log of (1+x).
log2(x, /, *[, memory_pool])	Compute base 2 logarithm.
log2_checked(x, /, *[, memory_pool])	Compute base 2 logarithm.
logb(x, b, /, *[, memory_pool])	Compute base b logarithm.
logb_checked(x, b, /, *[, memory_pool])	Compute base b logarithm.

Trigonometric Functions

Trigonometric functions are also supported, and also offer _checked variants which detect domain errors where appropriate.

acos(x, /, *[, memory_pool])	Compute the inverse cosine.
acos_checked(x, /, *[, memory_pool])	Compute the inverse cosine.
asin(x, /, *[, memory_pool])	Compute the inverse sine.
asin_checked(x, /, *[, memory_pool])	Compute the inverse sine.
atan(x, /, *[, memory_pool])	Compute the inverse tangent of x.
atan2(y, x, /, *[, memory_pool])	Compute the inverse tangent of y/x.
cos(x, /, *[, memory_pool])	Compute the cosine.
cos_checked(x, /, *[, memory_pool])	Compute the cosine.
sin(x, /, *[, memory_pool])	Compute the sine.
sin_checked(x, /, *[, memory_pool])	Compute the sine.
tan(x, /, *[, memory_pool])	Compute the tangent.
tan_checked(x, /, *[, memory_pool])	Compute the tangent.

Comparisons

These functions expect two inputs of the same type. If one of the inputs is null they return null.

equal(x, y, /, *[, memory_pool])	Compare values for equality (x == y).
greater(x, y, /, *[, memory_pool])	Compare values for ordered inequality (x > y).
greater_equal(x, y, /, *[, memory_pool])	Compare values for ordered inequality (x >= y).
less(x, y, /, *[, memory_pool])	Compare values for ordered inequality (x < y).
less_equal(x, y, /, *[, memory_pool])	Compare values for ordered inequality (x <= y).
not_equal(x, y, /, *[, memory_pool])	Compare values for inequality (x != y).

These functions take any number of arguments of a numeric or temporal type.

max_element_wise(*args[, skip_nulls, ...])	Find the element-wise maximum value.
min_element_wise(*args[, skip_nulls, ...])	Find the element-wise minimum value.

Logical Functions

These functions normally emit a null when one of the inputs is null. However, Kleene logic variants are provided (suffixed _kleene). See User Guide for details.

and_(x, y, /, *[, memory_pool])	Logical 'and' boolean values.
and_kleene(x, y, /, *[, memory_pool])	Logical 'and' boolean values (Kleene logic).
and_not(x, y, /, *[, memory_pool])	Logical 'and not' boolean values.
and_not_kleene(x, y, /, *[, memory_pool])	Logical 'and not' boolean values (Kleene logic).
invert(values, /, *[, memory_pool])	Invert boolean values.
or_(x, y, /, *[, memory_pool])	Logical 'or' boolean values.
or_kleene(x, y, /, *[, memory_pool])	Logical 'or' boolean values (Kleene logic).
xor(x, y, /, *[, memory_pool])	Logical 'xor' boolean values.

String Predicates

In these functions an empty string emits false in the output. For ASCII variants (prefixed ascii_) a string element with non-ASCII characters emits false in the output.

The first set of functions emit true if the input contains only characters of a given class.

ascii_is_alnum(strings, /, *[, memory_pool])	Classify strings as ASCII alphanumeric.
ascii_is_alpha(strings, /, *[, memory_pool])	Classify strings as ASCII alphabetic.
ascii_is_decimal(strings, /, *[, memory_pool])	Classify strings as ASCII decimal.
ascii_is_lower(strings, /, *[, memory_pool])	Classify strings as ASCII lowercase.
ascii_is_printable(strings, /, *[, memory_pool])	Classify strings as ASCII printable.
ascii_is_space(strings, /, *[, memory_pool])	Classify strings as ASCII whitespace.
ascii_is_upper(strings, /, *[, memory_pool])	Classify strings as ASCII uppercase.
utf8_is_alnum(strings, /, *[, memory_pool])	Classify strings as alphanumeric.
utf8_is_alpha(strings, /, *[, memory_pool])	Classify strings as alphabetic.
utf8_is_decimal(strings, /, *[, memory_pool])	Classify strings as decimal.
utf8_is_digit(strings, /, *[, memory_pool])	Classify strings as digits.
utf8_is_lower(strings, /, *[, memory_pool])	Classify strings as lowercase.
utf8_is_numeric(strings, /, *[, memory_pool])	Classify strings as numeric.
utf8_is_printable(strings, /, *[, memory_pool])	Classify strings as printable.
utf8_is_space(strings, /, *[, memory_pool])	Classify strings as whitespace.
utf8_is_upper(strings, /, *[, memory_pool])	Classify strings as uppercase.

The second set of functions also consider the order of characters in the string element.

ascii_is_title(strings, /, *[, memory_pool])	Classify strings as ASCII titlecase.
utf8_is_title(strings, /, *[, memory_pool])	Classify strings as titlecase.

The third set of functions examines string elements on a byte-by-byte basis.

string_is_ascii(strings, /, *[, memory_pool])

Classify strings as ASCII.

String Transforms

ascii_capitalize(strings, /, *[, memory_pool])	Capitalize the first character of ASCII input.
ascii_lower(strings, /, *[, memory_pool])	Transform ASCII input to lowercase.
ascii_reverse(strings, /, *[, memory_pool])	Reverse ASCII input.
ascii_swapcase(strings, /, *[, memory_pool])	Transform ASCII input by inverting casing.
ascii_title(strings, /, *[, memory_pool])	Titlecase each word of ASCII input.
ascii_upper(strings, /, *[, memory_pool])	Transform ASCII input to uppercase.
binary_length(strings, /, *[, memory_pool])	Compute string lengths.
binary_repeat(strings, num_repeats, /, *[, ...])	Repeat a binary string.
binary_replace_slice(strings, /, start, ...)	Replace a slice of a binary string.
binary_reverse(strings, /, *[, memory_pool])	Reverse binary input.
replace_substring(strings, /, pattern, ...)	Replace matching non-overlapping substrings with replacement.
replace_substring_regex(strings, /, pattern, ...)	Replace matching non-overlapping substrings with replacement.
utf8_capitalize(strings, /, *[, memory_pool])	Capitalize the first character of input.
utf8_length(strings, /, *[, memory_pool])	Compute UTF8 string lengths.
utf8_lower(strings, /, *[, memory_pool])	Transform input to lowercase.
utf8_replace_slice(strings, /, start, stop, ...)	Replace a slice of a string.
utf8_reverse(strings, /, *[, memory_pool])	Reverse input.
utf8_swapcase(strings, /, *[, memory_pool])	Transform input lowercase characters to uppercase and uppercase characters to lowercase.
utf8_title(strings, /, *[, memory_pool])	Titlecase each word of input.
utf8_upper(strings, /, *[, memory_pool])	Transform input to uppercase.

String Padding

ascii_center(strings, /, width[, padding, ...])	Center strings by padding with a given character.
ascii_lpad(strings, /, width[, padding, ...])	Right-align strings by padding with a given character.
ascii_rpad(strings, /, width[, padding, ...])	Left-align strings by padding with a given character.
utf8_center(strings, /, width[, padding, ...])	Center strings by padding with a given character.
utf8_lpad(strings, /, width[, padding, ...])	Right-align strings by padding with a given character.
utf8_rpad(strings, /, width[, padding, ...])	Left-align strings by padding with a given character.

String Trimming

ascii_ltrim(strings, /, characters, *[, ...])	Trim leading characters.
ascii_ltrim_whitespace(strings, /, *[, ...])	Trim leading ASCII whitespace characters.
ascii_rtrim(strings, /, characters, *[, ...])	Trim trailing characters.
ascii_rtrim_whitespace(strings, /, *[, ...])	Trim trailing ASCII whitespace characters.
ascii_trim(strings, /, characters, *[, ...])	Trim leading and trailing characters.
ascii_trim_whitespace(strings, /, *[, ...])	Trim leading and trailing ASCII whitespace characters.
utf8_ltrim(strings, /, characters, *[, ...])	Trim leading characters.
utf8_ltrim_whitespace(strings, /, *[, ...])	Trim leading whitespace characters.
utf8_rtrim(strings, /, characters, *[, ...])	Trim trailing characters.
utf8_rtrim_whitespace(strings, /, *[, ...])	Trim trailing whitespace characters.
utf8_trim(strings, /, characters, *[, ...])	Trim leading and trailing characters.
utf8_trim_whitespace(strings, /, *[, ...])	Trim leading and trailing whitespace characters.

String Splitting

ascii_split_whitespace(strings, /, *[, ...])	Split string according to any ASCII whitespace.
split_pattern(strings, /, pattern, *[, ...])	Split string according to separator.
split_pattern_regex(strings, /, pattern, *)	Split string according to regex pattern.
utf8_split_whitespace(strings, /, *[, ...])	Split string according to any Unicode whitespace.

String Component Extraction

extract_regex(strings, /, pattern, *[, ...])

Extract substrings captured by a regex pattern.

String Joining

binary_join(strings, separator, /, *[, ...])	Join a list of strings together with a separator.
binary_join_element_wise(*strings[, ...])	Join string arguments together, with the last argument as separator.

String Slicing

utf8_slice_codeunits(strings, /, start[, ...])

Slice string.

Containment Tests

count_substring(strings, /, pattern, *[, ...])	Count occurrences of substring.
count_substring_regex(strings, /, pattern, *)	Count occurrences of substring.
ends_with(strings, /, pattern, *[, ...])	Check if strings end with a literal pattern.
find_substring(strings, /, pattern, *[, ...])	Find first occurrence of substring.
find_substring_regex(strings, /, pattern, *)	Find location of first match of regex pattern.
index_in(values, /, value_set, *[, ...])	Return index of each element in a set of values.
is_in(values, /, value_set, *[, skip_nulls, ...])	Find each element in a set of values.
match_like(strings, /, pattern, *[, ...])	Match strings against SQL-style LIKE pattern.
match_substring(strings, /, pattern, *[, ...])	Match strings against literal pattern.
match_substring_regex(strings, /, pattern, *)	Match strings against regex pattern.
starts_with(strings, /, pattern, *[, ...])	Check if strings start with a literal pattern.
indices_nonzero(values, /, *[, memory_pool])	Return the indices of the values in the array that are non-zero.

Categorizations

is_finite(values, /, *[, memory_pool])	Return true if value is finite.
is_inf(values, /, *[, memory_pool])	Return true if infinity.
is_nan(values, /, *[, memory_pool])	Return true if NaN.
is_null(values, /, *[, nan_is_null, ...])	Return true if null (and optionally NaN).
is_valid(values, /, *[, memory_pool])	Return true if non-null.

Selecting / Multiplexing

case_when(cond, /, *cases[, memory_pool])	Choose values based on multiple conditions.
choose(indices, /, *values[, memory_pool])	Choose values from several arrays.
coalesce(*values[, memory_pool])	Select the first non-null value.
if_else(cond, left, right, /, *[, memory_pool])	Choose values based on a condition.

Conversions

cast(arr, target_type[, safe])	Cast array values to another data type.
ceil_temporal(timestamps, /[, multiple, ...])	Round temporal values up to nearest multiple of specified time unit.
floor_temporal(timestamps, /[, multiple, ...])	Round temporal values down to nearest multiple of specified time unit.
round_temporal(timestamps, /[, multiple, ...])	Round temporal values to the nearest multiple of specified time unit.
strftime(timestamps, /[, format, locale, ...])	Format temporal values according to a format string.
strptime(strings, /, format, unit, *[, ...])	Parse timestamps.

Temporal Component Extraction

day(values, /, *[, memory_pool])	Extract day number.
day_of_week(values, /, *[, count_from_zero, ...])	Extract day of the week number.
day_of_year(values, /, *[, memory_pool])	Extract day of year number.
hour(values, /, *[, memory_pool])	Extract hour value.
iso_week(values, /, *[, memory_pool])	Extract ISO week of year number.
iso_year(values, /, *[, memory_pool])	Extract ISO year number.
iso_calendar(values, /, *[, memory_pool])	Extract (ISO year, ISO week, ISO day of week) struct.
microsecond(values, /, *[, memory_pool])	Extract microsecond values.
millisecond(values, /, *[, memory_pool])	Extract millisecond values.
minute(values, /, *[, memory_pool])	Extract minute values.
month(values, /, *[, memory_pool])	Extract month number.
nanosecond(values, /, *[, memory_pool])	Extract nanosecond values.
quarter(values, /, *[, memory_pool])	Extract quarter of year number.
second(values, /, *[, memory_pool])	Extract second values.
subsecond(values, /, *[, memory_pool])	Extract subsecond values.
us_week(values, /, *[, memory_pool])	Extract US week of year number.
week(values, /, *[, week_starts_monday, ...])	Extract week of year number.
year(values, /, *[, memory_pool])	Extract year number.
year_month_day(values, /, *[, memory_pool])	Extract (year, month, day) struct.

Temporal Difference

day_time_interval_between(start, end, /, *)	Compute the number of days and milliseconds between two timestamps.
days_between(start, end, /, *[, memory_pool])	Compute the number of days between two timestamps.
hours_between(start, end, /, *[, memory_pool])	Compute the number of hours between two timestamps.
microseconds_between(start, end, /, *[, ...])	Compute the number of microseconds between two timestamps.
milliseconds_between(start, end, /, *[, ...])	Compute the number of millisecond boundaries between two timestamps.
minutes_between(start, end, /, *[, memory_pool])	Compute the number of minute boundaries between two timestamps.
month_day_nano_interval_between(start, end, /, *)	Compute the number of months, days and nanoseconds between two timestamps.
month_interval_between(start, end, /, *[, ...])	Compute the number of months between two timestamps.
nanoseconds_between(start, end, /, *[, ...])	Compute the number of nanoseconds between two timestamps.
quarters_between(start, end, /, *[, memory_pool])	Compute the number of quarters between two timestamps.
seconds_between(start, end, /, *[, memory_pool])	Compute the number of seconds between two timestamps.
weeks_between(start, end, /, *[, ...])	Compute the number of weeks between two timestamps.
years_between(start, end, /, *[, memory_pool])	Compute the number of years between two timestamps.

Timezone Handling

assume_timezone(timestamps, /, timezone, *)

Convert naive timestamp to timezone-aware timestamp.

Associative Transforms

dictionary_encode(array, /[, null_encoding, ...])	Dictionary-encode array.
unique(array, /, *[, memory_pool])	Compute unique elements.
value_counts(array, /, *[, memory_pool])	Compute counts of unique elements.

Selections

array_filter(array, selection_filter, /[, ...])	Filter with a boolean selection filter.
array_take(array, indices, /, *[, ...])	Select values from an array based on indices from another array.
drop_null(input, /, *[, memory_pool])	Drop nulls from the input.
filter(input, selection_filter, /[, ...])	Filter with a boolean selection filter.
take(data, indices, *[, boundscheck, ...])	Select values (or records) from array- or table-like data given integer selection indices.

Sorts and Partitions

array_sort_indices(array, /[, order, ...])	Return the indices that would sort an array.
partition_nth_indices(array, /, pivot, *[, ...])	Return the indices that would partition an array around a pivot.
select_k_unstable(input, /, k, sort_keys, *)	Select the indices of the first k ordered elements from the input.
sort_indices(input, /[, sort_keys, ...])	Return the indices that would sort an array, record batch or table.

Structural Transforms

fill_null_backward(values, /, *[, memory_pool])	Carry non-null values backward to fill null slots.
fill_null_forward(values, /, *[, memory_pool])	Carry non-null values forward to fill null slots.
list_element(lists, index, /, *[, memory_pool])	Compute elements using of nested list values using an index.
list_flatten(lists, /, *[, memory_pool])	Flatten list values.
list_parent_indices(lists, /, *[, memory_pool])	Compute parent indices of nested list values.
list_value_length(lists, /, *[, memory_pool])	Compute list lengths.
make_struct(*args[, field_names, ...])	Wrap Arrays into a StructArray.
replace_with_mask(values, mask, ...[, ...])	Replace items selected with a mask.
struct_field(values, /, indices, *[, ...])	Extract children of a struct or union by index.

Compute Options

ArraySortOptions([order, null_placement])	Options for the array_sort_indices function.
AssumeTimezoneOptions(timezone, *[, ...])	Options for the assume_timezone function.
CastOptions([target_type, ...])	Options for the cast function.
CountOptions([mode])	Options for the count function.
CountOptions([mode])	Options for the count function.
DayOfWeekOptions(*[, count_from_zero, ...])	Options for the day_of_week function.
DictionaryEncodeOptions([null_encoding])	Options for dictionary encoding.
ElementWiseAggregateOptions(*[, skip_nulls])	Options for element-wise aggregate functions.
ExtractRegexOptions(pattern)	Options for the extract_regex function.
FilterOptions([null_selection_behavior])	Options for selecting with a boolean filter.
IndexOptions(value)	Options for the index function.
JoinOptions([null_handling, null_replacement])	Options for the binary_join_element_wise function.
MakeStructOptions([field_names, ...])	Options for the make_struct function.
MatchSubstringOptions(pattern, *[, ignore_case])	Options for looking for a substring.
ModeOptions([n, skip_nulls, min_count])	Options for the mode function.
NullOptions(*[, nan_is_null])	Options for the is_null function.
PadOptions(width[, padding])	Options for padding strings.
PartitionNthOptions(pivot, *[, null_placement])	Options for the partition_nth_indices function.
QuantileOptions([q, interpolation, ...])	Options for the quantile function.
ReplaceSliceOptions(start, stop, replacement)	Options for replacing slices.
ReplaceSubstringOptions(pattern, replacement, *)	Options for replacing matched substrings.
RoundOptions([ndigits, round_mode])	Options for rounding numbers.
RoundTemporalOptions([multiple, unit])	Options for rounding temporal values.
RoundToMultipleOptions([multiple, round_mode])	Options for rounding numbers to a multiple.
ScalarAggregateOptions(*[, skip_nulls, ...])	Options for scalar aggregations.
ScalarAggregateOptions(*[, skip_nulls, ...])	Options for scalar aggregations.
SelectKOptions(k, sort_keys)	Options for top/bottom k-selection.
SetLookupOptions(value_set, *[, skip_nulls])	Options for the is_in and index_in functions.
SliceOptions(start[, stop, step])	Options for slicing.
SortOptions([sort_keys, null_placement])	Options for the sort_indices function.
SplitOptions(*[, max_splits, reverse])	Options for splitting on whitespace.
SplitPatternOptions(pattern, *[, ...])	Options for splitting on a string pattern.
StrftimeOptions([format, locale])	Options for the strftime function.
StrptimeOptions(format, unit)	Options for the strptime function.
StructFieldOptions(indices)	Options for the struct_field function.
TakeOptions(*[, boundscheck])	Options for the take and array_take functions.
TDigestOptions([q, delta, buffer_size, ...])	Options for the tdigest function.
TDigestOptions([q, delta, buffer_size, ...])	Options for the tdigest function.
TrimOptions(characters)	Options for trimming characters from strings.
VarianceOptions(*[, ddof, skip_nulls, min_count])	Options for the variance and stddev functions.
WeekOptions(*[, week_starts_monday, ...])	Options for the week function.

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