Module string 

String Operations Kernels Module - High-Performance String Processing and Text Analysis

String processing kernels for text manipulation, pattern matching, and string analysis operations with UTF-8 awareness and null-safe semantics. Essential infrastructure for text analytics, data cleansing, and string-heavy analytical workloads.

Core Operations

• String transformations: Case conversion, trimming, padding, and substring operations
• Pattern matching: Regular expression support with compiled pattern caching
• String comparison: Lexicographic ordering with UTF-8 aware collation
• Text analysis: Length calculation, character counting, and encoding detection
• String aggregation: Concatenation with configurable delimiters and null handling
• Search operations: Contains, starts with, ends with predicates with optimised implementations

Enums

PadSide

Side for string padding operations.

Functions

byte_length_dict

Computes the byte length of each string in a CategoricalArray slice.

byte_length_str

Computes the byte length of each string in a StringArray slice.

concat_dict_dict

Concatenates corresponding string pairs from two categorical arrays element-wise.

concat_dict_str

Concatenates dictionary values from a categorical array with strings from a string array.

concat_str_dict

Concatenates strings from a string array with dictionary values from a categorical array.

concat_str_str

Concatenates corresponding string pairs from two string arrays element-wise.

contains_dict_dict

Performs string predicate operations between two categorical arrays.

contains_dict_str

Performs string predicate operations between categorical and string arrays.

contains_str_dict

Performs string predicate operations between string and categorical arrays.

contains_str_str

Performs string predicate operations between two string arrays.

count_distinct_string

Counts the number of distinct string values in a string array window.

count_match_dict

Counts non-overlapping occurrences of needle in each categorical string element.

count_match_str

Counts non-overlapping occurrences of needle in each string element.

ends_with_dict_dict

Performs string predicate operations between two categorical arrays.

ends_with_dict_str

Performs string predicate operations between categorical and string arrays.

ends_with_str_dict

Performs string predicate operations between string and categorical arrays.

ends_with_str_str

Performs string predicate operations between two string arrays.

find_dict

Finds the first byte index of needle in each categorical string element. Returns -1 if not found.

find_str

Finds the first byte index of needle in each string element. Returns -1 if not found.

join_dict

Joins all non-null categorical string elements with delimiter, returning a single string. Returns None if all elements are null.

join_str

Joins all non-null string elements with delimiter, returning a single string. Returns None if all elements are null.

len_dict

Computes the character length of each string in a CategoricalArray<T> slice, returning an IntegerArray<T> with the same length and null semantics.

len_str

Computes the character length of each string in a StringArray<T> slice, returning an IntegerArray<T> with the same length and null semantics.

ltrim_dict

Trims leading whitespace from each categorical string element.

ltrim_str

Trims leading whitespace from each string element.

max_categorical_array

Finds the lexicographically maximum dictionary string in a categorical array window.

max_string_array

Finds the lexicographically maximum string in a string array window.

min_categorical_array

Finds the lexicographically minimum dictionary string in a categorical array window.

min_string_array

Finds the lexicographically minimum string in a string array window.

pad_dict

Pads each categorical string element to width characters using fill_char.

pad_str

Pads each string element to width characters using fill_char.

repeat_dict

Repeats each categorical string element n times.

repeat_str

Repeats each string element n times.

replace_dict

Replaces all occurrences of from with to in each categorical string element.

replace_str

Replaces all occurrences of from with to in each string element.

reverse_dict

Reverses each categorical string element by Unicode characters.

reverse_str

Reverses each string element by Unicode characters.

rtrim_dict

Trims trailing whitespace from each categorical string element.

rtrim_str

Trims trailing whitespace from each string element.

starts_with_dict_dict

Performs string predicate operations between two categorical arrays.

starts_with_dict_str

Performs string predicate operations between categorical and string arrays.

starts_with_str_dict

Performs string predicate operations between string and categorical arrays.

starts_with_str_str

Performs string predicate operations between two string arrays.

substring_dict

Extracts a character-based substring from each categorical string element.

substring_str

Extracts a character-based substring from each string element. start is the 0-based character offset. opt_len limits the number of characters taken.

to_lowercase_dict

Converts each categorical string element to lowercase.

to_lowercase_str

Converts each string element to lowercase.

to_uppercase_dict

Converts each categorical string element to uppercase.

to_uppercase_str

Converts each string element to uppercase.

trim_dict

Trims leading and trailing whitespace from each categorical string element.

trim_str

Trims leading and trailing whitespace from each string element.