/*
 * pg_reorg: lib/pg_reorg.sql.in
 *
 * Copyright (c) 2008-2009, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
 */

-- Adjust this setting to control where the objects get created.
SET search_path = public;

BEGIN;

CREATE SCHEMA reorg;

CREATE FUNCTION reorg.version() RETURNS text AS
'MODULE_PATHNAME', 'reorg_version'
LANGUAGE 'C' IMMUTABLE STRICT;

CREATE AGGREGATE reorg.array_accum (
    sfunc = array_append,
    basetype = anyelement,
    stype = anyarray,
    initcond = '{}'
);

CREATE FUNCTION reorg.oid2text(oid) RETURNS text AS
$$
	SELECT textin(regclassout($1));
$$
LANGUAGE sql STABLE STRICT;

CREATE FUNCTION reorg.get_index_columns(oid, text) RETURNS text AS
$$
  SELECT array_to_string(reorg.array_accum(quote_ident(attname)), $2)
    FROM pg_attribute,
         (SELECT indrelid,
                 indkey,
                 generate_series(0, indnatts-1) AS i
            FROM pg_index
           WHERE indexrelid = $1
         ) AS keys
   WHERE attrelid = indrelid
     AND attnum = indkey[i];
$$
LANGUAGE sql STABLE STRICT;

CREATE FUNCTION reorg.get_index_keys(oid, oid) RETURNS text AS
'MODULE_PATHNAME', 'reorg_get_index_keys'
LANGUAGE 'C' STABLE STRICT;

CREATE FUNCTION reorg.get_create_index_type(oid, name) RETURNS text AS
$$
  SELECT 'CREATE TYPE ' || $2 || ' AS (' ||
         array_to_string(reorg.array_accum(quote_ident(attname) || ' ' ||
           pg_catalog.format_type(atttypid, atttypmod)), ', ') || ')'
    FROM pg_attribute,
         (SELECT indrelid,
                 indkey,
                 generate_series(0, indnatts-1) AS i
            FROM pg_index
           WHERE indexrelid = $1
         ) AS keys
   WHERE attrelid = indrelid
     AND attnum = indkey[i];
$$
LANGUAGE sql STABLE STRICT;

CREATE FUNCTION reorg.get_create_trigger(relid oid, pkid oid)
  RETURNS text AS
$$
  SELECT 'CREATE TRIGGER z_reorg_trigger' ||
         ' BEFORE INSERT OR DELETE OR UPDATE ON ' || reorg.oid2text($1) ||
         ' FOR EACH ROW EXECUTE PROCEDURE reorg.reorg_trigger(' ||
         '''INSERT INTO reorg.log_' || $1 || '(pk, row) VALUES(' ||
         ' CASE WHEN $1 IS NULL THEN NULL ELSE (ROW($1.' ||
         reorg.get_index_columns($2, ', $1.') || ')::reorg.pk_' ||
         $1 || ') END, $2)'')';
$$
LANGUAGE sql STABLE STRICT;

CREATE FUNCTION reorg.get_assign(oid, text) RETURNS text AS
$$
  SELECT '(' || array_to_string(reorg.array_accum(attname), ', ') ||
         ') = (' || $2 || '.' ||
         array_to_string(reorg.array_accum(quote_ident(attname)), ', ' || $2 || '.') || ')'
    FROM (SELECT attname FROM pg_attribute
           WHERE attrelid = $1 AND attnum > 0
           ORDER BY attnum) tmp;
$$
LANGUAGE sql STABLE STRICT;

CREATE FUNCTION reorg.get_compare_pkey(oid, text)
  RETURNS text AS
$$
  SELECT '(' || array_to_string(reorg.array_accum(quote_ident(attname)), ', ') ||
         ') = (' || $2 || '.' ||
         array_to_string(reorg.array_accum(quote_ident(attname)), ', ' || $2 || '.') || ')'
    FROM pg_attribute,
         (SELECT indrelid,
                 indkey,
                 generate_series(0, indnatts-1) AS i
            FROM pg_index
           WHERE indexrelid = $1
         ) AS keys
   WHERE attrelid = indrelid
     AND attnum = indkey[i];
$$
LANGUAGE sql STABLE STRICT;

CREATE VIEW reorg.tables AS
  SELECT R.oid::regclass AS relname,
         R.oid AS relid,
         R.reltoastrelid AS reltoastrelid,
         CASE WHEN R.reltoastrelid = 0 THEN 0 ELSE (SELECT reltoastidxid FROM pg_class WHERE oid = R.reltoastrelid) END AS reltoastidxid,
         PK.indexrelid AS pkid,
         CK.indexrelid AS ckid,
         reorg.get_create_index_type(PK.indexrelid, 'reorg.pk_' || R.oid) AS create_pktype,
         'CREATE TABLE reorg.log_' || R.oid || ' (id bigserial PRIMARY KEY, pk reorg.pk_' || R.oid || ', row ' || reorg.oid2text(R.oid) || ')' AS create_log,
         reorg.get_create_trigger(R.oid, PK.indexrelid) AS create_trigger,
         'CREATE TABLE reorg.table_' || R.oid || ' WITH (' || array_to_string(array_append(R.reloptions, 'oids=' || CASE WHEN R.relhasoids THEN 'true' ELSE 'false' END), ',') || ') TABLESPACE ' || coalesce(quote_ident(S.spcname), 'pg_default') || ' AS SELECT * FROM ONLY ' || reorg.oid2text(R.oid) AS create_table,
         'DELETE FROM reorg.log_' || R.oid AS delete_log,
         'LOCK TABLE ' || reorg.oid2text(R.oid) || ' IN ACCESS EXCLUSIVE MODE NOWAIT' AS lock_table,
         reorg.get_index_keys(CK.indexrelid, R.oid) AS ckey,
         'SELECT * FROM reorg.log_' || R.oid || ' ORDER BY id LIMIT $1' AS sql_peek,
         'INSERT INTO reorg.table_' || R.oid || ' VALUES ($1.*)' AS sql_insert,
         'DELETE FROM reorg.table_' || R.oid || ' WHERE ' || reorg.get_compare_pkey(PK.indexrelid, '$1') AS sql_delete,
         'UPDATE reorg.table_' || R.oid || ' SET ' || reorg.get_assign(R.oid, '$2') || ' WHERE ' || reorg.get_compare_pkey(PK.indexrelid, '$1') AS sql_update,
         'DELETE FROM reorg.log_' || R.oid || ' WHERE id <= $1' AS sql_pop
    FROM pg_class R
         LEFT JOIN pg_class T ON R.reltoastrelid = T.oid
         LEFT JOIN (SELECT * FROM pg_index WHERE indisprimary) PK
                ON R.oid = PK.indrelid
         LEFT JOIN (SELECT CKI.* FROM pg_index CKI, pg_class CKT
                    WHERE CKI.indexrelid = CKT.oid AND CKI.indisclustered AND CKT.relam = 403) CK
                ON R.oid = CK.indrelid
         LEFT JOIN pg_namespace N ON N.oid = R.relnamespace
         LEFT JOIN pg_tablespace S ON S.oid = R.reltablespace
   WHERE R.relkind = 'r'
     AND N.nspname NOT IN ('pg_catalog', 'information_schema')
     AND N.nspname NOT LIKE E'pg\\_temp\\_%';

CREATE FUNCTION reorg.reorg_indexdef(oid, oid) RETURNS text AS
'MODULE_PATHNAME', 'reorg_indexdef'
LANGUAGE 'C' STABLE STRICT;

CREATE FUNCTION reorg.reorg_trigger() RETURNS trigger AS
'MODULE_PATHNAME', 'reorg_trigger'
LANGUAGE 'C' VOLATILE STRICT SECURITY DEFINER;

CREATE FUNCTION reorg.conflicted_triggers(oid) RETURNS SETOF name AS
$$
SELECT tgname FROM pg_trigger
 WHERE tgrelid = $1 AND tgname >= 'z_reorg_trigger'
$$
LANGUAGE sql STABLE STRICT;

CREATE FUNCTION reorg.disable_autovacuum(regclass) RETURNS void AS
'MODULE_PATHNAME', 'reorg_disable_autovacuum'
LANGUAGE 'C' VOLATILE STRICT;

CREATE FUNCTION reorg.reorg_apply(
  sql_peek      cstring,
  sql_insert    cstring,
  sql_delete    cstring,
  sql_update    cstring,
  sql_pop       cstring,
  count         integer)
RETURNS integer AS
'MODULE_PATHNAME', 'reorg_apply'
LANGUAGE 'C' VOLATILE;

CREATE FUNCTION reorg.reorg_swap(oid) RETURNS void AS
'MODULE_PATHNAME', 'reorg_swap'
LANGUAGE 'C' VOLATILE STRICT;

CREATE FUNCTION reorg.reorg_drop(oid) RETURNS void AS
'MODULE_PATHNAME', 'reorg_drop'
LANGUAGE 'C' VOLATILE STRICT;

COMMIT;