Throw on error if this method is called, signalling that a specific data.table
implemetation is needed for this method.
# S3 method for default ex_data_table_step( optree, ..., tables = list(), source_usage = NULL, source_limit = NULL, env = parent.frame() )
optree | relop operations tree. |
---|---|
... | not used, force later arguments to bind by name. |
tables | named list map from table names used in nodes to data.tables and data.frames. |
source_usage | list mapping source table names to vectors of columns used. |
source_limit | if not null limit all table sources to no more than this many rows (used for debugging). |
env | environment to work in. |