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ulid.sql
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CREATE OR REPLACE FUNCTION base32encode_time(input INT)
RETURNS VARCHAR
IMMUTABLE
AS
$$
WITH setup AS (
SELECT
-- crockford base32 alphabet
'0123456789ABCDEFGHJKMNPQRSTVWXYZ' as encoding
, BITAND(BITSHIFTRIGHT(input, (6 - 1) * 8), 256 - 1) as ts_byte_0
, BITAND(BITSHIFTRIGHT(input, (6 - 2) * 8), 256 - 1) as ts_byte_1
, BITAND(BITSHIFTRIGHT(input, (6 - 3) * 8), 256 - 1) as ts_byte_2
, BITAND(BITSHIFTRIGHT(input, (6 - 4) * 8), 256 - 1) as ts_byte_3
, BITAND(BITSHIFTRIGHT(input, (6 - 5) * 8), 256 - 1) as ts_byte_4
, BITAND(BITSHIFTRIGHT(input, (6 - 6) * 8), 256 - 1) as ts_byte_5
, BITSHIFTRIGHT(BITAND(ts_byte_0, 224), 5) AS ts_chr_0
, BITAND(ts_byte_0, 31) AS ts_chr_1
, BITSHIFTRIGHT(BITAND(ts_byte_1, 248), 3) AS ts_chr_2
, BITOR(
BITSHIFTLEFT(BITAND(ts_byte_1, 6), 2),
BITSHIFTRIGHT(BITAND(ts_byte_2, 192), 6)
) AS ts_chr_3
, BITSHIFTRIGHT(BITAND(ts_byte_2, 62), 1) AS ts_chr_4
, BITOR(
BITSHIFTLEFT(BITAND(ts_byte_2, 1), 4),
BITSHIFTRIGHT(BITAND(ts_byte_3, 240), 4)
) AS ts_chr_5
, BITOR(
BITSHIFTLEFT(BITAND(ts_byte_3, 15), 1),
BITSHIFTRIGHT(BITAND(ts_byte_4, 128), 7)
) AS ts_chr_6
, BITSHIFTRIGHT(BITAND(ts_byte_4, 124), 2) AS ts_chr_7
, BITOR(
BITSHIFTLEFT(BITAND(ts_byte_4, 3), 3),
BITSHIFTRIGHT(BITAND(ts_byte_5, 224), 5)
) AS ts_chr_8
, BITAND(ts_byte_5, 31) AS ts_chr_9
)
SELECT
SUBSTR(encoding, ts_chr_0 + 1, 1) ||
SUBSTR(encoding, ts_chr_1 + 1, 1) ||
SUBSTR(encoding, ts_chr_2 + 1, 1) ||
SUBSTR(encoding, ts_chr_3 + 1, 1) ||
SUBSTR(encoding, ts_chr_4 + 1, 1) ||
SUBSTR(encoding, ts_chr_5 + 1, 1) ||
SUBSTR(encoding, ts_chr_6 + 1, 1) ||
SUBSTR(encoding, ts_chr_7 + 1, 1) ||
SUBSTR(encoding, ts_chr_8 + 1, 1) ||
SUBSTR(encoding, ts_chr_9 + 1, 1)
FROM setup
$$
;
CREATE OR REPLACE FUNCTION base32encode_randomness(input INT)
RETURNS VARCHAR
IMMUTABLE
AS
$$
WITH setup AS (
SELECT
-- crockford base32 alphabet
'0123456789ABCDEFGHJKMNPQRSTVWXYZ' AS encoding
, BITAND(BITSHIFTRIGHT(input, (10 - 1) * 8), 256 - 1) AS ts_byte_0
, BITAND(BITSHIFTRIGHT(input, (10 - 2) * 8), 256 - 1) AS ts_byte_1
, BITAND(BITSHIFTRIGHT(input, (10 - 3) * 8), 256 - 1) AS ts_byte_2
, BITAND(BITSHIFTRIGHT(input, (10 - 4) * 8), 256 - 1) AS ts_byte_3
, BITAND(BITSHIFTRIGHT(input, (10 - 5) * 8), 256 - 1) AS ts_byte_4
, BITAND(BITSHIFTRIGHT(input, (10 - 6) * 8), 256 - 1) AS ts_byte_5
, BITAND(BITSHIFTRIGHT(input, (10 - 7) * 8), 256 - 1) AS ts_byte_6
, BITAND(BITSHIFTRIGHT(input, (10 - 8) * 8), 256 - 1) AS ts_byte_7
, BITAND(BITSHIFTRIGHT(input, (10 - 9) * 8), 256 - 1) AS ts_byte_8
, BITAND(BITSHIFTRIGHT(input, (10 - 10) * 8), 256 - 1) AS ts_byte_9
, BITSHIFTRIGHT(BITAND(ts_byte_0, 248), 3) AS ts_chr_0
, BITOR(
BITSHIFTLEFT(BITAND(ts_byte_0, 7), 2),
BITSHIFTRIGHT(BITAND(ts_byte_1, 192), 6)
) AS ts_chr_1
, BITSHIFTRIGHT(BITAND(ts_byte_1, 62), 1) AS ts_chr_2
, BITOR(
BITSHIFTLEFT(BITAND(ts_byte_1, 1), 4),
BITSHIFTRIGHT(BITAND(ts_byte_2, 240), 4)
) AS ts_chr_3
, BITOR(
BITSHIFTLEFT(BITAND(ts_byte_2, 15), 1),
BITSHIFTRIGHT(BITAND(ts_byte_3, 128), 7)
) AS ts_chr_4
, BITSHIFTRIGHT(BITAND(ts_byte_3, 124), 2) AS ts_chr_5
, BITOR(
BITSHIFTLEFT(BITAND(ts_byte_3, 3), 3),
BITSHIFTRIGHT(BITAND(ts_byte_4, 224), 5)
) AS ts_chr_6
, BITAND(ts_byte_4, 31) AS ts_chr_7
, BITSHIFTRIGHT(BITAND(ts_byte_5, 248), 3) AS ts_chr_8
, BITOR(
BITSHIFTLEFT(BITAND(ts_byte_5, 6), 2),
BITSHIFTRIGHT(BITAND(ts_byte_6, 192), 6)
) AS ts_chr_9
, BITSHIFTRIGHT(BITAND(ts_byte_6, 62), 1) AS ts_chr_10
, BITOR(
BITSHIFTLEFT(BITAND(ts_byte_6, 1), 4),
BITSHIFTRIGHT(BITAND(ts_byte_7, 240), 4)
) AS ts_chr_11
, BITOR(
BITSHIFTLEFT(BITAND(ts_byte_7, 15), 1),
BITSHIFTRIGHT(BITAND(ts_byte_8, 128), 7)
) AS ts_chr_12
, BITSHIFTRIGHT(BITAND(ts_byte_8, 124), 2) AS ts_chr_13
, BITOR(
BITSHIFTLEFT(BITAND(ts_byte_8, 3), 3),
BITSHIFTRIGHT(BITAND(ts_byte_9, 224), 5)
) AS ts_chr_14
, BITAND(ts_byte_9, 31) AS ts_chr_15
)
SELECT
SUBSTR(encoding, ts_chr_0 + 1, 1) ||
SUBSTR(encoding, ts_chr_1 + 1, 1) ||
SUBSTR(encoding, ts_chr_2 + 1, 1) ||
SUBSTR(encoding, ts_chr_3 + 1, 1) ||
SUBSTR(encoding, ts_chr_4 + 1, 1) ||
SUBSTR(encoding, ts_chr_5 + 1, 1) ||
SUBSTR(encoding, ts_chr_6 + 1, 1) ||
SUBSTR(encoding, ts_chr_7 + 1, 1) ||
SUBSTR(encoding, ts_chr_8 + 1, 1) ||
SUBSTR(encoding, ts_chr_9 + 1, 1) ||
SUBSTR(encoding, ts_chr_10 + 1, 1) ||
SUBSTR(encoding, ts_chr_11 + 1, 1) ||
SUBSTR(encoding, ts_chr_12 + 1, 1) ||
SUBSTR(encoding, ts_chr_13 + 1, 1) ||
SUBSTR(encoding, ts_chr_14 + 1, 1) ||
SUBSTR(encoding, ts_chr_15 + 1, 1)
FROM setup
$$;
-- Technically only 79 bytes of randomness
CREATE OR REPLACE FUNCTION random_80()
RETURNS INT
AS
$$
SELECT
BITSHIFTLEFT(BITAND(RANDOM(), 65535), 64) +
ABS(RANDOM())
$$;
CREATE OR REPLACE FUNCTION ULID()
RETURNS VARCHAR
AS
$$
SELECT
base32encode_time(DATE_PART(epoch_millisecond, CURRENT_TIMESTAMP())::int) ||
base32encode_randomness(random_80())
$$;
CREATE OR REPLACE FUNCTION ULID(timestamp INT)
RETURNS VARCHAR
AS
$$
SELECT
base32encode_time(timestamp) || base32encode_randomness(random_80())
$$;