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Boolean expression strings can be used when filtering
collections or tables using operations, such as
find() and remove(). The
expression is evaluated once for each document or row.
The following example of a boolean expression string uses
find() to search for all documents with a
“red” color attribute from the collection
“apples”:
apples.find('color = "red"').execute()
Similarly, to delete all red apples:
apples.remove('color = "red"').execute()