Drop directive
The DROP directive is used to drop a column in a record.
Syntax
drop :column [,:column]*
The :column
 is the name of the column in the record to be dropped.
Usage Notes
After the DROP directive is applied, the column and its associated value are removed from the record. Later directives will not be able to reference the dropped column.
Example
Using this record as an example:
{
"id": 1,
"timestamp": 1234434343,
"measurement": 10.45,
"isvalid": true
}
Applying this directive:
drop :isvalid,:measurement
results in a record with no isvalid
 or measurement
 fields:
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Created in 2020 by Google Inc.