mirror of
https://github.com/timescale/timescaledb.git
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7b94c573ba
- Directory structure now matches common practices - Regression tests now run with pg_regress via the PGXS infrastructure. - Unit tests do not integrate well with pg_regress and have to be run separately. - Docker functionality is separate from main Makefile. Run with `make -f docker.mk` to build and `make -f docker.mk run` to run the database in a container.
46 lines
1.9 KiB
PL/PgSQL
46 lines
1.9 KiB
PL/PgSQL
-- This file contains utilities for time conversion.
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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 extracting the internal (bigint) time value from the identifier with the given column_type.
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CREATE OR REPLACE FUNCTION _iobeamdb_internal.extract_time_sql(
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identifier text,
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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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BEGIN
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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('%s::bigint', identifier); --scale determined by user.
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WHEN 'TIMESTAMP'::regtype, 'TIMESTAMPTZ'::regtype THEN
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RETURN format('((EXTRACT(epoch FROM %s::timestamptz)*1e6)::bigint)', identifier); --microseconds since UTC epoch
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END CASE;
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END
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$BODY$;
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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 _iobeamdb_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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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, 'TIMESTAMPTZ'::regtype THEN
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--assume time_value is in microsec
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RETURN format('%2$s %1$L', to_timestamp(time_value::double precision / 1e6), column_type); --microseconds
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END CASE;
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END
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$BODY$;
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