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Check if a query can be applied to a Daf object

Source: R/query.R
has_query.Rd

Determines whether a query can be validly applied to a Daf object. This is useful for checking if the properties referenced in a query exist in the Daf object before attempting to execute the query.

Usage

has_query(daf, query)

Arguments

daf

A Daf object

query

Query string or object. Can be created using query operations such as Axis(), Lookup(), IsGreater(), etc.

Value

TRUE if query can be applied, FALSE otherwise

Details

See the Julia documentation for details.

See also

Axis, Lookup, Names, AsAxis, Fetch, IfMissing, IfNot, MaskSlice, SquareMaskColumn, SquareMaskRow, And, AndNot, Or, OrNot, Xor, XorNot, IsEqual, IsNotEqual, IsLess, IsLessEqual, IsGreater, IsGreaterEqual, IsMatch, IsNotMatch, CountBy, GroupBy and other query operations.