Query Statement¶

The query DSL is a robust API for describing the ETL process of deriving datasets specified by ForML projects from their original data sources represented by their logical schemas.

While constructing the DSL query statements, the API internally builds up a generic model of the required ETL process. The query has purely descriptive character, there is no native mechanism of its direct execution. Instead, it is expected to be parsed at runtime into a set of instructions corresponding to the selected feed and its target storage layer hosting the physical data sources matching the requested schemas.

Following is the list of the individual chapters covering this topic in detail:

Syntax Reference
- Grammar Notation
- Examples
Functions and Operators
- Aggregate
- Comparison
- Conversion
- Datetime
- Logical
- Math
- Window
Internal Design
- Model
- Parser