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pg_pathman--1.2--1.3.sql
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pg_pathman--1.2--1.3.sql
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/* ------------------------------------------------------------------------
*
* pg_pathman--1.1--1.2.sql
* Migration scripts to version 1.2
*
* Copyright (c) 2015-2016, Postgres Professional
*
* ------------------------------------------------------------------------
*/
/* ------------------------------------------------------------------------
* Alter config tables
* ----------------------------------------------------------------------*/
CREATE OR REPLACE FUNCTION @[email protected]_interval_value(
partrel REGCLASS,
attname TEXT,
parttype INTEGER,
range_interval TEXT)
RETURNS BOOL AS 'pg_pathman', 'validate_interval_value'
LANGUAGE C;
ALTER TABLE @[email protected]_config
ADD CHECK (@[email protected]_interval_value(partrel,
attname,
parttype,
range_interval));
/*
* Drop check constraint to be able to update column type. We recreate it
* later and it will be slightly different
*/
DROP FUNCTION @[email protected]_part_callback(REGPROC, BOOL) CASCADE;
/* Change type for init_callback attribute */
ALTER TABLE @[email protected]_config_params
ALTER COLUMN init_callback TYPE TEXT,
ALTER COLUMN init_callback DROP NOT NULL,
ALTER COLUMN init_callback SET DEFAULT NULL;
/* Set init_callback to NULL where it used to be 0 */
UPDATE @[email protected]_config_params
SET init_callback = NULL
WHERE init_callback = '-';
CREATE OR REPLACE FUNCTION @[email protected]_part_callback(
callback REGPROCEDURE,
raise_error BOOL DEFAULT TRUE)
RETURNS BOOL AS 'pg_pathman', 'validate_part_callback_pl'
LANGUAGE C STRICT;
ALTER TABLE @[email protected]_config_params
ADD CHECK (@[email protected]_part_callback(CASE WHEN init_callback IS NULL
THEN 0::REGPROCEDURE
ELSE init_callback::REGPROCEDURE
END));
/* ------------------------------------------------------------------------
* Drop irrelevant objects
* ----------------------------------------------------------------------*/
DROP FUNCTION @[email protected]_init_callback(REGCLASS, REGPROC);
DROP FUNCTION @[email protected]_attribute_type(REGCLASS, TEXT);
DROP FUNCTION @[email protected]_hash_partitions(REGCLASS, TEXT, INTEGER, BOOLEAN);
DROP FUNCTION @[email protected]_hash_partitions_internal(REGCLASS, TEXT, INTEGER);
DROP FUNCTION @[email protected]_range_condition(TEXT, ANYELEMENT, ANYELEMENT);
DROP FUNCTION @[email protected]_range_partition(REGCLASS, ANYELEMENT, TEXT, TEXT, OUT ANYARRAY);
DROP FUNCTION @[email protected]_range_partition(REGCLASS, BOOLEAN);
DROP FUNCTION @[email protected]_range_partition(REGCLASS, REGCLASS, ANYELEMENT, ANYELEMENT);
DROP FUNCTION @[email protected]_range_partition(REGCLASS);
DROP FUNCTION @[email protected]_range_partitions_internal(REGCLASS, REGCLASS, REGCLASS, ANYELEMENT);
DROP FUNCTION @[email protected]_foreign_keys(REGCLASS, REGCLASS);
DROP FUNCTION @[email protected]_on_partition_created_callback(REGCLASS, REGCLASS, REGPROCEDURE, ANYELEMENT, ANYELEMENT);
DROP FUNCTION @[email protected]_on_partition_created_callback(REGCLASS, REGCLASS, REGPROCEDURE);
/* ------------------------------------------------------------------------
* Alter functions' modifiers
* ----------------------------------------------------------------------*/
ALTER FUNCTION @[email protected]_set_param(REGCLASS, TEXT, ANYELEMENT) STRICT;
/* ------------------------------------------------------------------------
* (Re)create functions
* ----------------------------------------------------------------------*/
/*
* Invoke init_callback on RANGE partition.
*/
CREATE OR REPLACE FUNCTION @[email protected]_on_partition_created_callback(
parent_relid REGCLASS,
partition_relid REGCLASS,
init_callback REGPROCEDURE,
start_value ANYELEMENT,
end_value ANYELEMENT)
RETURNS VOID AS 'pg_pathman', 'invoke_on_partition_created_callback'
LANGUAGE C;
/*
* Invoke init_callback on HASH partition.
*/
CREATE OR REPLACE FUNCTION @[email protected]_on_partition_created_callback(
parent_relid REGCLASS,
partition_relid REGCLASS,
init_callback REGPROCEDURE)
RETURNS VOID AS 'pg_pathman', 'invoke_on_partition_created_callback'
LANGUAGE C;
/*
* Copy all of parent's foreign keys.
*/
CREATE OR REPLACE FUNCTION @[email protected]_foreign_keys(
parent_relid REGCLASS,
partition_relid REGCLASS)
RETURNS VOID AS
$$
DECLARE
rec RECORD;
BEGIN
PERFORM @[email protected]_relname(parent_relid);
PERFORM @[email protected]_relname(partition_relid);
FOR rec IN (SELECT oid as conid FROM pg_catalog.pg_constraint
WHERE conrelid = parent_relid AND contype = 'f')
LOOP
EXECUTE format('ALTER TABLE %s ADD %s',
partition_relid::TEXT,
pg_catalog.pg_get_constraintdef(rec.conid));
END LOOP;
END
$$ LANGUAGE plpgsql STRICT;
CREATE OR REPLACE FUNCTION @[email protected]_init_callback(
relation REGCLASS,
callback REGPROCEDURE DEFAULT 0)
RETURNS VOID AS
$$
DECLARE
regproc_text TEXT := NULL;
BEGIN
/* Fetch schema-qualified name of callback */
IF callback != 0 THEN
SELECT quote_ident(nspname) || '.' ||
quote_ident(proname) || '(' ||
(SELECT string_agg(x.argtype::REGTYPE::TEXT, ',')
FROM unnest(proargtypes) AS x(argtype)) ||
')'
FROM pg_catalog.pg_proc p JOIN pg_catalog.pg_namespace n
ON n.oid = p.pronamespace
WHERE p.oid = callback
INTO regproc_text; /* <= result */
END IF;
PERFORM @[email protected]_set_param(relation, 'init_callback', regproc_text);
END
$$
LANGUAGE plpgsql STRICT;
CREATE OR REPLACE FUNCTION @[email protected]_interval(
relation REGCLASS,
value ANYELEMENT)
RETURNS VOID AS
$$
DECLARE
affected INTEGER;
BEGIN
UPDATE @[email protected]_config
SET range_interval = value::text
WHERE partrel = relation AND parttype = 2;
/* Check number of affected rows */
GET DIAGNOSTICS affected = ROW_COUNT;
IF affected = 0 THEN
RAISE EXCEPTION 'table "%" is not partitioned by RANGE', relation;
END IF;
END
$$
LANGUAGE plpgsql;
CREATE OR REPLACE FUNCTION @[email protected]_partition(
relation REGCLASS,
new_name TEXT,
new_schema REGNAMESPACE,
new_tablespace TEXT)
RETURNS VOID AS
$$
DECLARE
orig_name TEXT;
orig_schema OID;
BEGIN
SELECT relname, relnamespace FROM pg_class
WHERE oid = relation
INTO orig_name, orig_schema;
/* Alter table name */
IF new_name != orig_name THEN
EXECUTE format('ALTER TABLE %s RENAME TO %s', relation, new_name);
END IF;
/* Alter table schema */
IF new_schema != orig_schema THEN
EXECUTE format('ALTER TABLE %s SET SCHEMA %s', relation, new_schema);
END IF;
/* Move to another tablespace */
IF NOT new_tablespace IS NULL THEN
EXECUTE format('ALTER TABLE %s SET TABLESPACE %s', relation, new_tablespace);
END IF;
END
$$ LANGUAGE plpgsql;
CREATE OR REPLACE FUNCTION @[email protected]_partition_key(
relid REGCLASS)
RETURNS TEXT AS
$$
SELECT attname FROM pathman_config WHERE partrel = relid;
$$
LANGUAGE sql STRICT;
CREATE OR REPLACE FUNCTION @[email protected]_partition_key_type(
relid REGCLASS)
RETURNS REGTYPE AS 'pg_pathman', 'get_partition_key_type'
LANGUAGE C STRICT;
CREATE OR REPLACE FUNCTION @[email protected]_hash_partitions(
parent_relid REGCLASS,
attribute TEXT,
partitions_count INTEGER,
partition_data BOOLEAN DEFAULT TRUE,
partition_names TEXT[] DEFAULT NULL,
tablespaces TEXT[] DEFAULT NULL)
RETURNS INTEGER AS
$$
BEGIN
PERFORM @[email protected]_relname(parent_relid);
IF partition_data = true THEN
/* Acquire data modification lock */
PERFORM @[email protected]_relation_modification(parent_relid);
ELSE
/* Acquire lock on parent */
PERFORM @[email protected]_partitioned_relation(parent_relid);
END IF;
attribute := lower(attribute);
PERFORM @[email protected]_relation_checks(parent_relid, attribute);
/* Insert new entry to pathman config */
INSERT INTO @[email protected]_config (partrel, attname, parttype)
VALUES (parent_relid, attribute, 1);
/* Create partitions */
PERFORM @[email protected]_hash_partitions_internal(parent_relid,
attribute,
partitions_count,
partition_names,
tablespaces);
/* Notify backend about changes */
PERFORM @[email protected]_create_partitions(parent_relid);
/* Copy data */
IF partition_data = true THEN
PERFORM @[email protected]_enable_parent(parent_relid, false);
PERFORM @[email protected]_data(parent_relid);
ELSE
PERFORM @[email protected]_enable_parent(parent_relid, true);
END IF;
RETURN partitions_count;
END
$$ LANGUAGE plpgsql
SET client_min_messages = WARNING;
CREATE OR REPLACE FUNCTION @[email protected]_hash_partition(
old_partition REGCLASS,
new_partition REGCLASS,
lock_parent BOOL DEFAULT TRUE)
RETURNS REGCLASS AS
$$
DECLARE
parent_relid REGCLASS;
part_attname TEXT; /* partitioned column */
old_constr_name TEXT; /* name of old_partition's constraint */
old_constr_def TEXT; /* definition of old_partition's constraint */
rel_persistence CHAR;
p_init_callback REGPROCEDURE;
BEGIN
PERFORM @[email protected]_relname(old_partition);
PERFORM @[email protected]_relname(new_partition);
/* Parent relation */
parent_relid := @[email protected]_parent_of_partition(old_partition);
IF lock_parent THEN
/* Acquire data modification lock (prevent further modifications) */
PERFORM @[email protected]_relation_modification(parent_relid);
ELSE
/* Acquire lock on parent */
PERFORM @[email protected]_partitioned_relation(parent_relid);
END IF;
/* Acquire data modification lock (prevent further modifications) */
PERFORM @[email protected]_relation_modification(old_partition);
PERFORM @[email protected]_relation_modification(new_partition);
/* Ignore temporary tables */
SELECT relpersistence FROM pg_catalog.pg_class
WHERE oid = new_partition INTO rel_persistence;
IF rel_persistence = 't'::CHAR THEN
RAISE EXCEPTION 'temporary table "%" cannot be used as a partition',
new_partition::TEXT;
END IF;
/* Check that new partition has an equal structure as parent does */
IF NOT @[email protected]_relations_equality(parent_relid, new_partition) THEN
RAISE EXCEPTION 'partition must have the exact same structure as parent';
END IF;
/* Get partitioning key */
part_attname := attname FROM @[email protected]_config WHERE partrel = parent_relid;
IF part_attname IS NULL THEN
RAISE EXCEPTION 'table "%" is not partitioned', parent_relid::TEXT;
END IF;
/* Fetch name of old_partition's HASH constraint */
old_constr_name = @[email protected]_check_constraint_name(old_partition::REGCLASS,
part_attname);
/* Fetch definition of old_partition's HASH constraint */
SELECT pg_catalog.pg_get_constraintdef(oid) FROM pg_catalog.pg_constraint
WHERE conrelid = old_partition AND conname = old_constr_name
INTO old_constr_def;
/* Detach old partition */
EXECUTE format('ALTER TABLE %s NO INHERIT %s', old_partition, parent_relid);
EXECUTE format('ALTER TABLE %s DROP CONSTRAINT %s',
old_partition,
old_constr_name);
/* Attach the new one */
EXECUTE format('ALTER TABLE %s INHERIT %s', new_partition, parent_relid);
EXECUTE format('ALTER TABLE %s ADD CONSTRAINT %s %s',
new_partition,
@[email protected]_check_constraint_name(new_partition::REGCLASS,
part_attname),
old_constr_def);
/* Fetch init_callback from 'params' table */
WITH stub_callback(stub) as (values (0))
SELECT init_callback
FROM stub_callback
LEFT JOIN @[email protected]_config_params AS params
ON params.partrel = parent_relid
INTO p_init_callback;
/* Finally invoke init_callback */
PERFORM @[email protected]_on_partition_created_callback(parent_relid,
new_partition,
p_init_callback);
/* Invalidate cache */
PERFORM @[email protected]_update_partitions(parent_relid);
RETURN new_partition;
END
$$
LANGUAGE plpgsql;
CREATE OR REPLACE FUNCTION @[email protected]_hash_update_trigger(
parent_relid REGCLASS)
RETURNS TEXT AS
$$
DECLARE
func TEXT := 'CREATE OR REPLACE FUNCTION %1$s()
RETURNS TRIGGER AS
$body$
DECLARE
old_idx INTEGER; /* partition indices */
new_idx INTEGER;
BEGIN
old_idx := @[email protected]_hash_part_idx(%9$s(OLD.%2$s), %3$s);
new_idx := @[email protected]_hash_part_idx(%9$s(NEW.%2$s), %3$s);
IF old_idx = new_idx THEN
RETURN NEW;
END IF;
EXECUTE format(''DELETE FROM %8$s WHERE %4$s'', old_idx)
USING %5$s;
EXECUTE format(''INSERT INTO %8$s VALUES (%6$s)'', new_idx)
USING %7$s;
RETURN NULL;
END $body$
LANGUAGE plpgsql';
trigger TEXT := 'CREATE TRIGGER %s
BEFORE UPDATE ON %s
FOR EACH ROW EXECUTE PROCEDURE %s()';
att_names TEXT;
old_fields TEXT;
new_fields TEXT;
att_val_fmt TEXT;
att_fmt TEXT;
attr TEXT;
plain_schema TEXT;
plain_relname TEXT;
child_relname_format TEXT;
funcname TEXT;
triggername TEXT;
atttype REGTYPE;
partitions_count INTEGER;
BEGIN
attr := attname FROM @[email protected]_config WHERE partrel = parent_relid;
IF attr IS NULL THEN
RAISE EXCEPTION 'table "%" is not partitioned', parent_relid::TEXT;
END IF;
SELECT string_agg(attname, ', '),
string_agg('OLD.' || attname, ', '),
string_agg('NEW.' || attname, ', '),
string_agg('CASE WHEN NOT $' || attnum || ' IS NULL THEN ' ||
attname || ' = $' || attnum || ' ' ||
'ELSE ' ||
attname || ' IS NULL END',
' AND '),
string_agg('$' || attnum, ', ')
FROM pg_catalog.pg_attribute
WHERE attrelid = parent_relid AND attnum > 0
INTO att_names,
old_fields,
new_fields,
att_val_fmt,
att_fmt;
partitions_count := @[email protected]_number_of_partitions(parent_relid);
/* Build trigger & trigger function's names */
funcname := @[email protected]_update_trigger_func_name(parent_relid);
triggername := @[email protected]_update_trigger_name(parent_relid);
/* Build partition name template */
SELECT * INTO plain_schema, plain_relname
FROM @[email protected]_plain_schema_and_relname(parent_relid);
child_relname_format := quote_ident(plain_schema) || '.' ||
quote_ident(plain_relname || '_%s');
/* Fetch base hash function for atttype */
atttype := @[email protected]_partition_key_type(parent_relid);
/* Format function definition and execute it */
EXECUTE format(func, funcname, attr, partitions_count, att_val_fmt,
old_fields, att_fmt, new_fields, child_relname_format,
@[email protected]_type_hash_func(atttype)::TEXT);
/* Create trigger on each partition */
FOR num IN 0..partitions_count-1
LOOP
EXECUTE format(trigger,
triggername,
format(child_relname_format, num),
funcname);
END LOOP;
return funcname;
END
$$ LANGUAGE plpgsql;
CREATE OR REPLACE FUNCTION @[email protected]_hash_partitions_internal(
parent_relid REGCLASS,
attribute TEXT,
partitions_count INTEGER,
partition_names TEXT[] DEFAULT NULL,
tablespaces TEXT[] DEFAULT NULL)
RETURNS VOID AS 'pg_pathman', 'create_hash_partitions_internal'
LANGUAGE C;
CREATE OR REPLACE FUNCTION @[email protected]_range_partition(
partition_relid REGCLASS,
split_value ANYELEMENT,
partition_name TEXT DEFAULT NULL,
tablespace TEXT DEFAULT NULL,
OUT p_range ANYARRAY)
RETURNS ANYARRAY AS
$$
DECLARE
v_parent REGCLASS;
v_attname TEXT;
v_atttype REGTYPE;
v_cond TEXT;
v_new_partition TEXT;
v_part_type INTEGER;
v_check_name TEXT;
BEGIN
v_parent = @[email protected]_parent_of_partition(partition_relid);
/* Acquire lock on parent */
PERFORM @[email protected]_partitioned_relation(v_parent);
/* Acquire data modification lock (prevent further modifications) */
PERFORM @[email protected]_relation_modification(partition_relid);
v_atttype = @[email protected]_partition_key_type(v_parent);
SELECT attname, parttype
FROM @[email protected]_config
WHERE partrel = v_parent
INTO v_attname, v_part_type;
/* Check if this is a RANGE partition */
IF v_part_type != 2 THEN
RAISE EXCEPTION '"%" is not a RANGE partition', partition_relid::TEXT;
END IF;
/* Get partition values range */
EXECUTE format('SELECT @[email protected]_part_range($1, NULL::%s)',
@[email protected]_base_type(v_atttype)::TEXT)
USING partition_relid
INTO p_range;
IF p_range IS NULL THEN
RAISE EXCEPTION 'could not find specified partition';
END IF;
/* Check if value fit into the range */
IF p_range[1] > split_value OR p_range[2] <= split_value
THEN
RAISE EXCEPTION 'specified value does not fit into the range [%, %)',
p_range[1], p_range[2];
END IF;
/* Create new partition */
v_new_partition := @[email protected]_single_range_partition(v_parent,
split_value,
p_range[2],
partition_name,
tablespace);
/* Copy data */
v_cond := @[email protected]_range_condition(v_new_partition::regclass,
v_attname, split_value, p_range[2]);
EXECUTE format('WITH part_data AS (DELETE FROM %s WHERE %s RETURNING *)
INSERT INTO %s SELECT * FROM part_data',
partition_relid::TEXT,
v_cond,
v_new_partition);
/* Alter original partition */
v_cond := @[email protected]_range_condition(partition_relid::regclass,
v_attname, p_range[1], split_value);
v_check_name := @[email protected]_check_constraint_name(partition_relid, v_attname);
EXECUTE format('ALTER TABLE %s DROP CONSTRAINT %s',
partition_relid::TEXT,
v_check_name);
EXECUTE format('ALTER TABLE %s ADD CONSTRAINT %s CHECK (%s)',
partition_relid::TEXT,
v_check_name,
v_cond);
/* Tell backend to reload configuration */
PERFORM @[email protected]_update_partitions(v_parent);
END
$$
LANGUAGE plpgsql;
CREATE OR REPLACE FUNCTION @[email protected]_range_partitions(
partitions REGCLASS[])
RETURNS VOID AS 'pg_pathman', 'merge_range_partitions'
LANGUAGE C STRICT;
CREATE OR REPLACE FUNCTION @[email protected]_range_partitions(
partition1 REGCLASS,
partition2 REGCLASS)
RETURNS VOID AS
$$
BEGIN
PERFORM @[email protected]_range_partitions(array[partition1, partition2]::regclass[]);
END
$$ LANGUAGE plpgsql;
CREATE OR REPLACE FUNCTION @[email protected]_range_partition(
parent_relid REGCLASS,
partition_name TEXT DEFAULT NULL,
tablespace TEXT DEFAULT NULL)
RETURNS TEXT AS
$$
DECLARE
v_atttype REGTYPE;
v_part_name TEXT;
v_interval TEXT;
BEGIN
PERFORM @[email protected]_relname(parent_relid);
/* Acquire lock on parent */
PERFORM @[email protected]_partitioned_relation(parent_relid);
v_atttype := @[email protected]_partition_key_type(parent_relid);
SELECT range_interval
FROM @[email protected]_config
WHERE partrel = parent_relid
INTO v_interval;
EXECUTE
format('SELECT @[email protected]_partition_internal($1, $2, $3, ARRAY[]::%s[], $4, $5)',
@[email protected]_base_type(v_atttype)::TEXT)
USING
parent_relid,
v_atttype,
v_interval,
partition_name,
tablespace
INTO
v_part_name;
/* Invalidate cache */
PERFORM @[email protected]_update_partitions(parent_relid);
RETURN v_part_name;
END
$$
LANGUAGE plpgsql;
CREATE OR REPLACE FUNCTION @[email protected]_partition_internal(
parent_relid REGCLASS,
p_atttype REGTYPE,
p_interval TEXT,
p_range ANYARRAY DEFAULT NULL,
partition_name TEXT DEFAULT NULL,
tablespace TEXT DEFAULT NULL)
RETURNS TEXT AS
$$
DECLARE
v_part_name TEXT;
v_atttype REGTYPE;
v_args_format TEXT;
BEGIN
IF @[email protected]_number_of_partitions(parent_relid) = 0 THEN
RAISE EXCEPTION 'cannot append to empty partitions set';
END IF;
v_atttype := @[email protected]_base_type(p_atttype);
/* We have to pass fake NULL casted to column's type */
EXECUTE format('SELECT @[email protected]_part_range($1, -1, NULL::%s)',
v_atttype::TEXT)
USING parent_relid
INTO p_range;
IF p_range[2] IS NULL THEN
RAISE EXCEPTION 'Cannot append partition because last partition''s range is half open';
END IF;
IF @[email protected]_date_type(p_atttype) THEN
v_args_format := format('$1, $2, ($2 + $3::interval)::%s, $4, $5', v_atttype::TEXT);
ELSE
v_args_format := format('$1, $2, $2 + $3::%s, $4, $5', v_atttype::TEXT);
END IF;
EXECUTE
format('SELECT @[email protected]_single_range_partition(%s)', v_args_format)
USING
parent_relid,
p_range[2],
p_interval,
partition_name,
tablespace
INTO
v_part_name;
RETURN v_part_name;
END
$$
LANGUAGE plpgsql;
CREATE OR REPLACE FUNCTION @[email protected]_range_partition(
parent_relid REGCLASS,
partition_name TEXT DEFAULT NULL,
tablespace TEXT DEFAULT NULL)
RETURNS TEXT AS
$$
DECLARE
v_atttype REGTYPE;
v_part_name TEXT;
v_interval TEXT;
BEGIN
PERFORM @[email protected]_relname(parent_relid);
/* Acquire lock on parent */
PERFORM @[email protected]_partitioned_relation(parent_relid);
v_atttype := @[email protected]_partition_key_type(parent_relid);
SELECT range_interval
FROM @[email protected]_config
WHERE partrel = parent_relid
INTO v_interval;
EXECUTE
format('SELECT @[email protected]_partition_internal($1, $2, $3, ARRAY[]::%s[], $4, $5)',
@[email protected]_base_type(v_atttype)::TEXT)
USING
parent_relid,
v_atttype,
v_interval,
partition_name,
tablespace
INTO
v_part_name;
/* Invalidate cache */
PERFORM @[email protected]_update_partitions(parent_relid);
RETURN v_part_name;
END
$$
LANGUAGE plpgsql;
CREATE OR REPLACE FUNCTION @[email protected]_partition_internal(
parent_relid REGCLASS,
p_atttype REGTYPE,
p_interval TEXT,
p_range ANYARRAY DEFAULT NULL,
partition_name TEXT DEFAULT NULL,
tablespace TEXT DEFAULT NULL)
RETURNS TEXT AS
$$
DECLARE
v_part_name TEXT;
v_atttype REGTYPE;
v_args_format TEXT;
BEGIN
IF @[email protected]_number_of_partitions(parent_relid) = 0 THEN
RAISE EXCEPTION 'cannot prepend to empty partitions set';
END IF;
v_atttype := @[email protected]_base_type(p_atttype);
/* We have to pass fake NULL casted to column's type */
EXECUTE format('SELECT @[email protected]_part_range($1, 0, NULL::%s)',
v_atttype::TEXT)
USING parent_relid
INTO p_range;
IF p_range[1] IS NULL THEN
RAISE EXCEPTION 'Cannot prepend partition because first partition''s range is half open';
END IF;
IF @[email protected]_date_type(p_atttype) THEN
v_args_format := format('$1, ($2 - $3::interval)::%s, $2, $4, $5', v_atttype::TEXT);
ELSE
v_args_format := format('$1, $2 - $3::%s, $2, $4, $5', v_atttype::TEXT);
END IF;
EXECUTE
format('SELECT @[email protected]_single_range_partition(%s)', v_args_format)
USING
parent_relid,
p_range[1],
p_interval,
partition_name,
tablespace
INTO
v_part_name;
RETURN v_part_name;
END
$$
LANGUAGE plpgsql;
CREATE OR REPLACE FUNCTION @[email protected]_range_partition(
parent_relid REGCLASS,
partition_relid REGCLASS,
start_value ANYELEMENT,
end_value ANYELEMENT)
RETURNS TEXT AS
$$
DECLARE
v_attname TEXT;
rel_persistence CHAR;
v_init_callback REGPROCEDURE;
BEGIN
PERFORM @[email protected]_relname(parent_relid);
PERFORM @[email protected]_relname(partition_relid);
/* Acquire lock on parent */
PERFORM @[email protected]_partitioned_relation(parent_relid);
/* Ignore temporary tables */
SELECT relpersistence FROM pg_catalog.pg_class
WHERE oid = partition_relid INTO rel_persistence;
IF rel_persistence = 't'::CHAR THEN
RAISE EXCEPTION 'temporary table "%" cannot be used as a partition',
partition_relid::TEXT;
END IF;
/* check range overlap */
PERFORM @[email protected]_range_available(parent_relid, start_value, end_value);
IF NOT @[email protected]_relations_equality(parent_relid, partition_relid) THEN
RAISE EXCEPTION 'partition must have the exact same structure as parent';
END IF;
/* Set inheritance */
EXECUTE format('ALTER TABLE %s INHERIT %s', partition_relid, parent_relid);
v_attname := attname FROM @[email protected]_config WHERE partrel = parent_relid;
IF v_attname IS NULL THEN
RAISE EXCEPTION 'table "%" is not partitioned', parent_relid::TEXT;
END IF;
/* Set check constraint */
EXECUTE format('ALTER TABLE %s ADD CONSTRAINT %s CHECK (%s)',
partition_relid::TEXT,
@[email protected]_check_constraint_name(partition_relid, v_attname),
@[email protected]_range_condition(partition_relid,
v_attname,
start_value,
end_value));
/* Fetch init_callback from 'params' table */
WITH stub_callback(stub) as (values (0))
SELECT init_callback
FROM stub_callback
LEFT JOIN @[email protected]_config_params AS params
ON params.partrel = parent_relid
INTO v_init_callback;
PERFORM @[email protected]_on_partition_created_callback(parent_relid,
partition_relid,
v_init_callback,
start_value,
end_value);
/* Invalidate cache */
PERFORM @[email protected]_update_partitions(parent_relid);
RETURN partition_relid;
END
$$
LANGUAGE plpgsql;
CREATE OR REPLACE FUNCTION @[email protected]_range_partition(
partition_relid REGCLASS)
RETURNS TEXT AS
$$
DECLARE
v_attname TEXT;
parent_relid REGCLASS;
BEGIN
parent_relid := @[email protected]_parent_of_partition(partition_relid);
/* Acquire lock on parent */
PERFORM @[email protected]_relation_modification(parent_relid);
v_attname := attname
FROM @[email protected]_config
WHERE partrel = parent_relid;
IF v_attname IS NULL THEN
RAISE EXCEPTION 'table "%" is not partitioned', parent_relid::TEXT;
END IF;
/* Remove inheritance */
EXECUTE format('ALTER TABLE %s NO INHERIT %s',
partition_relid::TEXT,
parent_relid::TEXT);
/* Remove check constraint */
EXECUTE format('ALTER TABLE %s DROP CONSTRAINT %s',
partition_relid::TEXT,
@[email protected]_check_constraint_name(partition_relid, v_attname));
/* Invalidate cache */
PERFORM @[email protected]_update_partitions(parent_relid);
RETURN partition_relid;
END
$$
LANGUAGE plpgsql;
CREATE OR REPLACE FUNCTION @[email protected]_range_partition(
partition_relid REGCLASS,
delete_data BOOLEAN DEFAULT TRUE)
RETURNS TEXT AS
$$
DECLARE
parent_relid REGCLASS;
part_name TEXT;
v_relkind CHAR;
v_rows BIGINT;
v_part_type INTEGER;
BEGIN
parent_relid := @[email protected]_parent_of_partition(partition_relid);
part_name := partition_relid::TEXT; /* save the name to be returned */
SELECT parttype
FROM @[email protected]_config
WHERE partrel = parent_relid
INTO v_part_type;
/* Check if this is a RANGE partition */
IF v_part_type != 2 THEN
RAISE EXCEPTION '"%" is not a RANGE partition', partition_relid::TEXT;
END IF;
/* Acquire lock on parent */
PERFORM @[email protected]_partitioned_relation(parent_relid);
IF NOT delete_data THEN
EXECUTE format('INSERT INTO %s SELECT * FROM %s',
parent_relid::TEXT,
partition_relid::TEXT);
GET DIAGNOSTICS v_rows = ROW_COUNT;
/* Show number of copied rows */
RAISE NOTICE '% rows copied from %', v_rows, partition_relid::TEXT;
END IF;
SELECT relkind FROM pg_catalog.pg_class
WHERE oid = partition_relid
INTO v_relkind;
/*
* Determine the kind of child relation. It can be either regular
* table (r) or foreign table (f). Depending on relkind we use
* DROP TABLE or DROP FOREIGN TABLE.
*/
IF v_relkind = 'f' THEN
EXECUTE format('DROP FOREIGN TABLE %s', partition_relid::TEXT);
ELSE
EXECUTE format('DROP TABLE %s', partition_relid::TEXT);
END IF;
/* Invalidate cache */
PERFORM @[email protected]_update_partitions(parent_relid);
RETURN part_name;
END
$$
LANGUAGE plpgsql
SET pg_pathman.enable_partitionfilter = off;
CREATE OR REPLACE FUNCTION @[email protected]_range_partition_expand_next(
partition_relid REGCLASS)
RETURNS VOID AS 'pg_pathman', 'drop_range_partition_expand_next'
LANGUAGE C STRICT;
CREATE OR REPLACE FUNCTION @[email protected]_range_condition(
p_relid REGCLASS,
attribute TEXT,
start_value ANYELEMENT,
end_value ANYELEMENT)
RETURNS TEXT AS 'pg_pathman', 'build_range_condition'