String functions

[alfonsorr]

• def ascii(e: Column): Column
• def base64(e: Column): Column
• def concat_ws(sep: String, exprs: Column*): Column
• def decode(value: Column, charset: String): Column
• def encode(value: Column, charset: String): Column
• def format_number(x: Column, d: Int): Column
• def format_string(format: String, arguments: Column*): Column
• def initcap(e: Column): Column
• def instr(str: Column, substring: String): Column
• def length(e: Column): Column
• def levenshtein(l: Column, r: Column): Column
• def locate(substr: String, str: Column, pos: Int): Column
• def locate(substr: String, str: Column): Column
• def lower(e: Column): Column
• def lpad(str: Column, len: Int, pad: String): Column
• def ltrim(e: Column, trimString: String): Column
• def ltrim(e: Column): Column
• def overlay(src: Column, replace: Column, pos: Column): Column
• def overlay(src: Column, replace: Column, pos: Column, len: Column): Column
• def regexp_extract(e: Column, exp: String, groupIdx: Int): Column
• def regexp_replace(e: Column, pattern: Column, replacement: Column): Column
• def regexp_replace(e: Column, pattern: String, replacement: String): Column
• def repeat(str: Column, n: Int): Column
• def rpad(str: Column, len: Int, pad: String): Column
• def rtrim(e: Column, trimString: String): Column
• def rtrim(e: Column): Column
• def soundex(e: Column): Column
• def split(str: Column, pattern: String, limit: Int): Column
• def split(str: Column, pattern: String): Column
• def substring(str: Column, pos: Int, len: Int): Column
• def substring_index(str: Column, delim: String, count: Int): Column
• def translate(src: Column, matchingString: String, replaceString: String): Column
• def trim(e: Column, trimString: String): Column
• def trim(e: Column): Column
• def unbase64(e: Column): Column
• def upper(e: Column): Column