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

Functions

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.

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.

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.

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.

regex_dict_dict

Applies regular expression patterns between two categorical arrays via dictionary lookup.

regex_dict_str

Applies regular expression patterns to categorical array values against string patterns.

regex_str_dict

Applies regular expression patterns from categorical dictionary against string values.

regex_str_str

Applies regular expression pattern matching between two string arrays.

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.

string_predicate_masks

Helper for predicate kernels: produce optional input masks and a fresh output mask