BEGIN; -- Create new expression type for IS [NOT] NULL INSERT INTO config.upgrade_log (version) VALUES ('0269'); -- Scott McKellar ALTER TABLE query.expression DROP CONSTRAINT expression_type; ALTER TABLE query.expression ADD CONSTRAINT expression_type CHECK ( type IN ( 'xbet', -- between 'xbind', -- bind variable 'xbool', -- boolean 'xcase', -- case 'xcast', -- cast 'xcol', -- column 'xex', -- exists 'xfld', -- field 'xfunc', -- function 'xin', -- in 'xisnull' -- is null 'xnull', -- null 'xnum', -- number 'xop', -- operator 'xstr', -- string 'xsubq' -- subquery ) ); -- Create updatable view for IS NULL expressions CREATE OR REPLACE VIEW query.expr_xisnull AS SELECT id, parenthesize, parent_expr, seq_no, left_operand, negate FROM query.expression WHERE type = 'xisnull'; CREATE OR REPLACE RULE query_expr_xisnull_insert_rule AS ON INSERT TO query.expr_xisnull DO INSTEAD INSERT INTO query.expression ( id, type, parenthesize, parent_expr, seq_no, left_operand, negate ) VALUES ( COALESCE(NEW.id, NEXTVAL('query.expression_id_seq'::REGCLASS)), 'xisnull', COALESCE(NEW.parenthesize, FALSE), NEW.parent_expr, COALESCE(NEW.seq_no, 1), NEW.left_operand, NEW.negate ); CREATE OR REPLACE RULE query_expr_xisnull_update_rule AS ON UPDATE TO query.expr_xisnull DO INSTEAD UPDATE query.expression SET id = NEW.id, parenthesize = NEW.parenthesize, parent_expr = NEW.parent_expr, seq_no = NEW.seq_no, left_operand = NEW.left_operand, negate = NEW.negate WHERE id = OLD.id; CREATE OR REPLACE RULE query_expr_xisnull_delete_rule AS ON DELETE TO query.expr_xisnull DO INSTEAD DELETE FROM query.expression WHERE id = OLD.id; COMMIT;