OPAL Verbs By Category¶

Verb	Description
Aggregate verbs	Aggregate verbs establish an aggregate context: multiple input rows generate fewer, summarizing, output rows.
Filter verbs	Filter verbs select particular rows from the input row set, emitting the matches as output.
Join verbs	Join verbs link multiple datasets together.
Metadata verbs	Metadata verbs modify the metadata of the dataset and the columns in the dataset, rather than directly acting on the data itself.
Metrics verbs	Metrics verbs create, aggregate, or normalize time series values.
Projection verbs	Projection verbs create, remove, or rename columns in a dataset.
Semistructured verbs	Semistructured verbs act upon, or produce, arrays or objects that are treated as scalars.