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The functions for adding and updating dimensions have been refactored in C to: - improve usage of proper error codes - make messages that better conform with the PostgreSQL standard. - improve security by avoiding that lots of code run under SECURITY DEFINER A new if_not_exists option has also been added to add_dimension() and a the number of partitions can now be set using the new set_number_partitions() function. A bug in the validation of smallint time intervals has been fixed. The previous code didn't check for intervals > 0 and smallint intervals accepted values up to UINT16_MAX instead of INT16_MAX.
58 lines
2.9 KiB
PL/PgSQL
58 lines
2.9 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@', '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@', '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@', '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@', '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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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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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, time_type REGTYPE) RETURNS BIGINT
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AS '@MODULE_PATHNAME@', 'time_to_internal' LANGUAGE C IMMUTABLE PARALLEL SAFE STRICT;
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