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README.md

Redshift UDFs

This directory contains user-defined functions which mimic the behavior of proprietary functions in Redshift. Each UDF within this directory will be automatically synchronized to the bqutil project within the rs dataset for reference in queries.

For example, if you'd like to reference the translate function within your query, you can reference it like the following:

SELECT bqutil.rs.translate('mint tea', 'inea', 'osin')

UDFs

Documentation

initcap(string_expr STRING)

Returns the decimal representation of the first character in the string_expr. Redshift docs

SELECT bqutil.rs.initcap('À vaillant coeur rien d’impossible')
  , bqutil.rs.initcap('640 k!ouGht tO BE enough~for_anyONE')
  , bqutil.rs.initcap('Simplicity & élÉgance are unpopular because they require hard-work&discipline')
  , bqutil.rs.initcap('one+one is   "(two-one)*[two]"')
  , bqutil.rs.initcap('<lorem>[email protected]')

'À Vaillant Coeur Rien D’Impossible', '640 K!Ought To Be Enough~For_Anyone', 'Simplicity & Élégance Are Unpopular Because They Require Hard-Work&Discipline', 'One+One Is   "(Two-One)*[Two]"', '<Lorem>[email protected]'

interval_literal_to_seconds(interval_literal STRING)

This function parses a Redshift interval literal and converts it to seconds.

SELECT
  bqutil.rs.interval_literal_to_seconds('0.5 days, 3 hours, 59 minutes'),
  bqutil.rs.interval_literal_to_seconds('0.5 d,3h, 59m')

57540, 57540

translate(expression STRING, characters_to_replace STRING, characters_to_substitute STRING)

For a given expression, replaces all occurrences of specified characters with specified substitutes. Existing characters are mapped to replacement characters by their positions in the characters_to_replace and characters_to_substitute arguments. If more characters are specified in the characters_to_replace argument than in the characters_to_substitute argument, the extra characters from the characters_to_replace argument are omitted in the return value. Redshift docs

SELECT bqutil.rs.translate('mint tea', 'inea', 'osin')

most tin

split_part(string STRING, delimiter STRING, part INT64)

Splits a string on the specified delimiter and returns the part at the specified position. Position of the portion to return (counting from 1). Must be an integer greater than 0. If part is larger than the number of string portions, SPLIT_PART returns an empty string. If delimiter is not found in string, then the returned value contains the contents of the specified part, which might be the entire string or an empty value. Redshift docs

SELECT bqutil.rs.split_part('2020-02-02', '-' , 1)

2020