26.13.4 Union of PGX Frames
You can join two PgxFrames that have compatible columns (that is,
same type and order).
opg4j> <first-frame>.union(<secondframe>).print()<first-frame>.union(<first-frame>).print();<first-frame>.union(<first-frame>).print()The rows of the resulting
PgxFrame are the union of the rows from the two original frames.
Parent topic: PgxFrames Tabular Data-Structure