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https://github.com/timescale/timescaledb.git
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974788516a
We've decided to adopt the ts_ prefix on all exported C functions in order to avoid having symbol conflicts with future postgres functions. We've already started using this prefix on new functions and this commit adds the prefix to to the old functions.
60 lines
3.0 KiB
PL/PgSQL
60 lines
3.0 KiB
PL/PgSQL
-- This file contains utilities for time conversion.
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CREATE OR REPLACE FUNCTION _timescaledb_internal.to_microseconds(ts TIMESTAMPTZ) RETURNS BIGINT
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AS '@MODULE_PATHNAME@', 'ts_pg_timestamp_to_microseconds' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
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CREATE OR REPLACE FUNCTION _timescaledb_internal.to_unix_microseconds(ts TIMESTAMPTZ) RETURNS BIGINT
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AS '@MODULE_PATHNAME@', 'ts_pg_timestamp_to_unix_microseconds' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
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CREATE OR REPLACE FUNCTION _timescaledb_internal.to_timestamp(unixtime_us BIGINT) RETURNS TIMESTAMPTZ
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AS '@MODULE_PATHNAME@', 'ts_pg_unix_microseconds_to_timestamp' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
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CREATE OR REPLACE FUNCTION _timescaledb_internal.to_timestamp_pg(postgres_us BIGINT) RETURNS TIMESTAMPTZ
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AS '@MODULE_PATHNAME@', 'ts_pg_microseconds_to_timestamp' LANGUAGE C IMMUTABLE STRICT PARALLEL SAFE;
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-- Time can be represented in a hypertable as an int* (bigint/integer/smallint) or as a timestamp type (
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-- with or without timezones). In or metatables and other internal systems all time values are stored as bigint.
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-- Converting from int* columns to internal representation is a cast to bigint.
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-- Converting from timestamps to internal representation is conversion to epoch (in microseconds).
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-- Gets the sql code for representing the literal for the given time value (in the internal representation) as the column_type.
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CREATE OR REPLACE FUNCTION _timescaledb_internal.time_literal_sql(
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time_value BIGINT,
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column_type REGTYPE
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)
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RETURNS text LANGUAGE PLPGSQL STABLE AS
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$BODY$
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DECLARE
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ret text;
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BEGIN
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IF time_value IS NULL THEN
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RETURN format('%L', NULL);
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END IF;
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CASE column_type
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WHEN 'BIGINT'::regtype, 'INTEGER'::regtype, 'SMALLINT'::regtype THEN
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RETURN format('%L', time_value); -- scale determined by user.
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WHEN 'TIMESTAMP'::regtype THEN
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--the time_value for timestamps w/o tz does not depend on local timezones. So perform at UTC.
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RETURN format('TIMESTAMP %1$L', timezone('UTC',_timescaledb_internal.to_timestamp(time_value))); -- microseconds
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WHEN 'TIMESTAMPTZ'::regtype THEN
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-- assume time_value is in microsec
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RETURN format('TIMESTAMPTZ %1$L', _timescaledb_internal.to_timestamp(time_value)); -- microseconds
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WHEN 'DATE'::regtype THEN
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RETURN format('%L', timezone('UTC',_timescaledb_internal.to_timestamp(time_value))::date);
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ELSE
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EXECUTE 'SELECT format(''%L'', $1::' || column_type::text || ')' into ret using time_value;
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RETURN ret;
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END CASE;
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END
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$BODY$;
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CREATE OR REPLACE FUNCTION _timescaledb_internal.interval_to_usec(
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chunk_interval INTERVAL
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)
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RETURNS BIGINT LANGUAGE SQL IMMUTABLE PARALLEL SAFE AS
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$BODY$
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SELECT (int_sec * 1000000)::bigint from extract(epoch from chunk_interval) as int_sec;
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$BODY$;
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CREATE OR REPLACE FUNCTION _timescaledb_internal.time_to_internal(time_element anyelement) RETURNS BIGINT
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AS '@MODULE_PATHNAME@', 'ts_time_to_internal' LANGUAGE C IMMUTABLE PARALLEL SAFE STRICT;
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