$PIECE(string, delimiter, field_index)

Explode string into an array using delimiter, and return the field_indexth element of the array.

$PIECE("ABC,DEF,GHI", ",") -> "ABC"

$PIECE("ABC,DEF,GHI", ",", 2) -> "DEF"

$PIECE("ABC,DEF,GHI", ",", 2, 3) -> "DEF,GHI"


$PIECE("ABC,DEF,GHI", ",", 5) -> ""

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