The "commons-compiler" API, including the "IExpressionEvaluator", "IScriptEvaluator", "IClassBodyEvaluator" and "ISimpleCompiler" interfaces.

Core implementation of Logback, a reliable, generic, fast and flexible logging framework.

Spark SQL is Apache Spark's module for working with structured data based on DataFrames.

The "JANINO" implementation of the "commons-compiler" API: Super-small, super-fast, independent from the JDK's "tools.jar".

Hive Query Language

Apache Solr (module: core)

Spark Project Catalyst

This module connects Table/SQL API and runtime. It is responsible for translating and optimizing a table program into a Flink pipeline.

Core Calcite APIs and engine

PDI Engine

This module contains classes that are required by a task manager for execution of table programs.