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CREATE TABLE newtable (id int);
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 hidden batch(es)
ALTER TABLE newtable ADD COLUMNS f1 float8, f2 int;
ERROR: syntax error at or near "float8" LINE 2: ADD COLUMNS f1 float8, f2 int; ^
 hidden batch(es)
ALTER TABLE newtable ADD COLUMN f1 float8, f2 int, f3 text;
ERROR: syntax error at or near "f2" LINE 2: ADD COLUMN f1 float8, f2 int, f3 text; ^
 hidden batch(es)
ALTER TABLE newtable ADD COLUMN f1 float8, ADD COLUMN f2 int, ADD COLUMN f3 text;
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 hidden batch(es)