list_functions.tsv

Name	Description
list[index]	Bracket notation serves as an alias for list_extract.
list[begin:end]	Bracket notation with colon is an alias for list_slice.
list[begin:end:step]	list_slice in bracket notation with an added step feature.
array_pop_back(list)	Returns the list without the last element.
array_pop_front(list)	Returns the list without the first element.
flatten(list_of_lists)	Concatenate a list of lists into a single list. This only flattens one level of the list (see examples).
len(list)	Return the length of the list.
list_aggregate(list, name)	Executes the aggregate function name on the elements of list. See the List Aggregates section for more details.
list_any_value(list)	Returns the first non-null value in the list.
list_append(list, element)	Appends element to list.
list_concat(list1, list2)	Concatenate two lists. NULL inputs are skipped. See also ||
list_contains(list, element)	Returns true if the list contains the element.
list_cosine_similarity(list1, list2)	Compute the cosine similarity between two lists.
list_cosine_distance(list1, list2)	Compute the cosine distance between two lists. Equivalent to 1.0 - list_cosine_similarity.
list_distance(list1, list2)	Calculates the Euclidean distance between two points with coordinates given in two inputs lists of equal length.
list_distinct(list)	Removes all duplicates and NULL values from a list. Does not preserve the original order.
list_dot_product(list1, list2)	Computes the dot product of two same-sized lists of numbers.
list_negative_dot_product(list1, list2)	Computes the negative dot product of two same-sized lists of numbers. Equivalent to - list_dot_product.
list_extract(list, index)	Extract the indexth (1-based) value from the list.
list_filter(list, lambda)	Constructs a list from those elements of the input list for which the lambda function returns true. See the Lambda Functions page for more details.
list_grade_up(list)	Works like sort, but the results are the indexes that correspond to the position in the original list instead of the actual values.
list_has_all(list, sub-list)	Returns true if all elements of sub-list exist in list.
list_has_any(list1, list2)	Returns true if any elements exist is both lists.
list_intersect(list1, list2)	Returns a list of all the elements that exist in both l1 and l2, without duplicates.
list_position(list, element)	Returns the index of the element if the list contains the element. If the element is not found, it returns NULL.
list_prepend(element, list)	Prepends element to list.
list_reduce(list, lambda)	Returns a single value that is the result of applying the lambda function to each element of the input list. See the Lambda Functions page for more details.
list_resize(list, size[, value])	Resizes the list to contain size elements. Initializes new elements with value or NULL if value is not set.
list_reverse_sort(list)	Sorts the elements of the list in reverse order. See the Sorting Lists section for more details about the NULL sorting order.
list_reverse(list)	Reverses the list.
list_select(value_list, index_list)	Returns a list based on the elements selected by the index_list.
list_slice(list, begin, end, step)	list_slice with added step feature.
list_slice(list, begin, end)	Extract a sublist using slice conventions. Negative values are accepted. See slicing.
list_sort(list)	Sorts the elements of the list. See the Sorting Lists section for more details about the sorting order and the NULL sorting order.
list_transform(list, lambda)	Returns a list that is the result of applying the lambda function to each element of the input list. See the Lambda Functions page for more details.
list_unique(list)	Counts the unique elements of a list.
list_value(any, ...)	Create a LIST containing the argument values.
list_where(value_list, mask_list)	Returns a list with the BOOLEANs in mask_list applied as a mask to the value_list.
list_zip(list_1, list_2, ...[, truncate])	Zips k LISTs to a new LIST whose length will be that of the longest list. Its elements are structs of k elements from each list list_1, …, list_k, missing elements are replaced with NULL. If truncate is set, all lists are truncated to the smallest list length.
unnest(list)	Unnests a list by one level. Note that this is a special function that alters the cardinality of the result. See the unnest page for more details.