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The UnNest operator unpacks incoming tuple with a multi value at= tribute (e.g. a list) to create multiple tuples each containg one value fro= m that attribute.
attribute:
The attribute that should be unpack.useInnerMetadata
: Boolean; optional; default is false. Req=
uires the attribute to unpack to be a list of tuples, each with meta data. =
If set to true and if the meta data schema of the tuples to be unpacked mat=
ches the meta data schema of the outer tuple, the meta data from the unpack=
ed tuple is set as meta data of the output of the unnest operator.output = =3D UNNEST({ attribute=3D'myAttribute' },input)