mirror of
https://github.com/timescale/timescaledb.git
synced 2025-05-14 17:43:34 +08:00
ab71c4a1c1
This patch marks time_bucket_ng() as IMMUTABLE. Two exceptions are: - time_bucket_ng(interval, timestamptz) timestamptz - time_bucket_ng(interval, timestamptz, timestamptz) timestamptz ... due to their implementation, see the comments. These two overloaded versions were introduced only for backward compatibility with time_bucket() and are not needed for building continuous aggregates.
61 lines
3.7 KiB
SQL
61 lines
3.7 KiB
SQL
-- This file and its contents are licensed under the Apache License 2.0.
|
|
-- Please see the included NOTICE for copyright information and
|
|
-- LICENSE-APACHE for a copy of the license.
|
|
|
|
-- time_bucket_ng() is an _experimental_ new version of time_bucket().
|
|
--
|
|
-- Unlike time_bucket(), time_bucket_ng() supports variable-sized buckets,
|
|
-- such as months and years, and also timezones. Note that the behavior
|
|
-- and the interface of this function are subjects to change. There could
|
|
-- be bugs, and the implementation doesn't claim to be complete. Use at
|
|
-- your own risk.
|
|
--
|
|
-- This function may return different results for the same arguments depending
|
|
-- on the version of local timezone database. Despite this fact, function is
|
|
-- marked as IMMUTABLE. This is consistent with the volatility [1] of the
|
|
-- functions provided by PostgreSQL. See discussion [2] for more details.
|
|
--
|
|
-- We don't forbid users to work with timestamptz's from the future, nor warn
|
|
-- about this corner case. This behavior is consistent with PostgreSQL
|
|
-- behavior [3].
|
|
--
|
|
-- [1]: https://www.postgresql.org/docs/current/xfunc-volatility.html
|
|
-- [2]: https://postgr.es/m/CAJ7c6TOMG8zSNEZtCn5SPe+cCk3Lfxb71ZaQwT2F4T7PJ_t=KA@mail.gmail.com
|
|
-- [3]: https://www.postgresql.org/docs/current/datatype-datetime.html#DATATYPE-TIMEZONES
|
|
|
|
-- DATE versions of time_bucket_ng().
|
|
CREATE OR REPLACE FUNCTION timescaledb_experimental.time_bucket_ng(bucket_width INTERVAL, ts DATE) RETURNS DATE
|
|
AS '@MODULE_PATHNAME@', 'ts_time_bucket_ng_date' LANGUAGE C IMMUTABLE PARALLEL SAFE STRICT;
|
|
|
|
CREATE OR REPLACE FUNCTION timescaledb_experimental.time_bucket_ng(bucket_width INTERVAL, ts DATE, origin DATE) RETURNS DATE
|
|
AS '@MODULE_PATHNAME@', 'ts_time_bucket_ng_date' LANGUAGE C IMMUTABLE PARALLEL SAFE STRICT;
|
|
|
|
-- TIMESTAMP versions of time_bucket_ng().
|
|
CREATE OR REPLACE FUNCTION timescaledb_experimental.time_bucket_ng(bucket_width INTERVAL, ts TIMESTAMP) RETURNS TIMESTAMP
|
|
AS '@MODULE_PATHNAME@', 'ts_time_bucket_ng_timestamp' LANGUAGE C IMMUTABLE PARALLEL SAFE STRICT;
|
|
|
|
CREATE OR REPLACE FUNCTION timescaledb_experimental.time_bucket_ng(bucket_width INTERVAL, ts TIMESTAMP, origin TIMESTAMP) RETURNS TIMESTAMP
|
|
AS '@MODULE_PATHNAME@', 'ts_time_bucket_ng_timestamp' LANGUAGE C IMMUTABLE PARALLEL SAFE STRICT;
|
|
|
|
-- TIMESTAMPTZ versions of time_bucket_ng().
|
|
CREATE OR REPLACE FUNCTION timescaledb_experimental.time_bucket_ng(bucket_width INTERVAL, ts TIMESTAMPTZ, timezone TEXT) RETURNS TIMESTAMPTZ
|
|
AS '@MODULE_PATHNAME@', 'ts_time_bucket_ng_timezone' LANGUAGE C IMMUTABLE PARALLEL SAFE STRICT;
|
|
CREATE OR REPLACE FUNCTION timescaledb_experimental.time_bucket_ng(bucket_width INTERVAL, ts TIMESTAMPTZ, origin TIMESTAMPTZ, timezone TEXT) RETURNS TIMESTAMPTZ
|
|
AS '@MODULE_PATHNAME@', 'ts_time_bucket_ng_timezone_origin' LANGUAGE C IMMUTABLE PARALLEL SAFE STRICT;
|
|
|
|
|
|
-- The following two versions of time_bucket_ng() are kept only for the backward
|
|
-- compatibility with time_bucket(). They convert 'ts' to UTC instead of treating
|
|
-- it in the given timezone, which is almost certainly not something you want.
|
|
-- Future versions may WARN you about this fact, and be completely removed
|
|
-- eventually.
|
|
--
|
|
-- These functions are STABLE because their implementation relies on the STABLE
|
|
-- function timestamptz_date(). The latest is STABLE because it accounts for the
|
|
-- session parameters.
|
|
CREATE OR REPLACE FUNCTION timescaledb_experimental.time_bucket_ng(bucket_width INTERVAL, ts TIMESTAMPTZ) RETURNS TIMESTAMPTZ
|
|
AS '@MODULE_PATHNAME@', 'ts_time_bucket_ng_timestamptz' LANGUAGE C STABLE PARALLEL SAFE STRICT;
|
|
|
|
CREATE OR REPLACE FUNCTION timescaledb_experimental.time_bucket_ng(bucket_width INTERVAL, ts TIMESTAMPTZ, origin TIMESTAMPTZ) RETURNS TIMESTAMPTZ
|
|
AS '@MODULE_PATHNAME@', 'ts_time_bucket_ng_timestamptz' LANGUAGE C STABLE PARALLEL SAFE STRICT;
|