Lazy operations
This set of S3 classes describe the action of dplyr verbs. These are currently used for SQL sources to separate the description of operations in R from their computation in SQL. This API is very new so is likely to evolve in the future.
op_base(x, vars, class = character()) op_single(name, x, dots = list(), args = list()) add_op_single(name, .data, dots = list(), args = list()) op_double(name, x, y, args = list()) op_grps(op) op_vars(op) op_sort(op) op_frame(op)
op_vars() and op_grps() compute the variables and groups from
a sequence of lazy operations. op_sort() and op_frame() tracks the
order and frame for use in window functions.
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