mirror of
https://github.com/timescale/timescaledb.git
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bfe58b61f7
Clean up the table schema to get rid of legacy tables and functionality that makes it more difficult to provide an upgrade path. Notable changes: * Get rid of legacy tables and code * Simplify directory structure for SQL code * Simplify table hierarchy: remove root table and make chunk tables * inherit directly from main table * Change chunk table suffix from _data to _chunk * Simplify schema usage: _timescaledb_internal for internal functions. * _timescaledb_catalog for metadata tables. * Remove postgres_fdw dependency * Improve code comments in sql code
59 lines
2.4 KiB
PL/PgSQL
59 lines
2.4 KiB
PL/PgSQL
-- Trigger for when chunk rows are changed.
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-- On Insert: create chunk table, add indexes, add constraints.
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-- On Update: change constraints.
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-- On Delete: drop table
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CREATE OR REPLACE FUNCTION _timescaledb_internal.on_change_chunk()
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RETURNS TRIGGER LANGUAGE PLPGSQL AS
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$BODY$
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DECLARE
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kind pg_class.relkind%type;
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BEGIN
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IF TG_OP = 'INSERT' THEN
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PERFORM _timescaledb_internal.create_chunk_table(NEW.schema_name, NEW.table_name,
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h.schema_name, h.table_name, p.tablespace,
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p.keyspace_start, p.keyspace_end, pe.id)
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FROM _timescaledb_catalog.partition p
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INNER JOIN _timescaledb_catalog.partition_epoch pe ON (pe.id = p.epoch_id)
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INNER JOIN _timescaledb_catalog.hypertable h ON (h.id = pe.hypertable_id)
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WHERE p.id = NEW.partition_id;
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PERFORM _timescaledb_internal.create_chunk_index_row(NEW.schema_name, NEW.table_name,
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hi.main_schema_name, hi.main_index_name, hi.definition)
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FROM _timescaledb_catalog.partition p
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INNER JOIN _timescaledb_catalog.partition_epoch pe ON (pe.id = p.epoch_id)
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INNER JOIN _timescaledb_catalog.hypertable_index hi ON (hi.hypertable_id = pe.hypertable_id)
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WHERE p.id = NEW.partition_id;
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-- todo: can go into create_local_data_table?
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PERFORM _timescaledb_internal.set_time_constraint(NEW.schema_name, NEW.table_name, NEW.start_time, NEW.end_time);
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RETURN NEW;
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ELSIF TG_OP = 'DELETE' THEN
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-- when deleting the chunk row from the metadata table,
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-- also DROP the actual chunk table that holds data.
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-- Note that the table could already be deleted in case this
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-- trigger fires as a result of a DROP TABLE on the hypertable
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-- that this chunk belongs to.
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EXECUTE format(
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$$
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SELECT c.relkind FROM pg_class c WHERE relname = '%I' AND relnamespace = '%I'::regnamespace
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$$, OLD.table_name, OLD.schema_name
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) INTO kind;
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IF kind IS NULL THEN
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RETURN OLD;
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END IF;
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EXECUTE format(
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$$
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DROP TABLE %I.%I
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$$, OLD.schema_name, OLD.table_name
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);
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RETURN OLD;
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END IF;
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PERFORM _timescaledb_internal.on_trigger_error(TG_OP, TG_TABLE_SCHEMA, TG_TABLE_NAME);
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END
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$BODY$;
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